g. Ideal fof spe-
dat lightirvg eHects and baddighiirig.
Citizefif 92TA operates on 3-6 Vdc
CAT# BLU-92
$3*50 63Ch QUANTITY
AVAILABLE
10forS32.00 • I00for$275.00
z
n
S
TOLL FREE ORDER LINES 1-800-826-5432
FAX (818) 781-2653 • INFORMATION (818) 904-0524
Minimum Order $10M0 • AH Orders Can Be Charged To Visa, Mastsrcard Or Discovered • Ouantities Limited *
Calffornia, Add Sales Tax • Shipping ArKt Handfmg $330 for ih& 4$ Continental United States - Alt Others including
Alaska, Hawaii, PM And Canada Must Pay FuU Shipping • No C.O.D. * Prices Subject to change without nothe.
€QA60
We Sell QUALITY PARTS • We Have DISCOUNT PRICES • We Ship FAST
PC Board w/Rf Modulator
(and lots of other parts)
HIGHEST QUALITY METAL CASSETTES (Erased)
J
W0 recently received a load of these
PC boards which contain, among other
Ihiftgs, a RF modulalor. With a tittle
desoldering yau should be able to
liborato a working unit from the board.
Also contains a 780ST voltage regulator
with a couple of heats inks. 20 ICs, ca-
pacitors, resistors, diodos and connec-
tors. No hook-up jnbmiation available
on the moduiator.
CAT# VMB-1 $2 7S each
RELAYS'
A GREAT DE4L on 10 Amp
Solid State Relays
10 amp soltd state relays,
removed from equipment
and leslod. Control voitage:
3-32 Vdc, Load; 10 antps up to 250 Vac,
Standard "hockey -puck* size: 2.27' X
Mr X 0.95". UL and CSA listed
CAT# SSRLY*11 U $8,25 eac^
10 for $80.00
5 Vdc Latching Relay
Omron # G6EK'134P-ST-US 5VDC
Tiny. DIP compatibte,
dual-coil latching. SPDT
relay. 5 Vdc, 1 23 ohm coils.
Contacts rated 2 amps @ 30 Vdc. 0.62*
X 0.3e* X 0.3" high. Sealed Wack case.
TTL compatible. UL and CSA listed.
CAT#LRLY-3 $1J5each
Premium quality noetal tape in C-60 cassettes (30 or more per skie).
One of the fmest •brartd-name* fapes on the rnar^^el in durable, dear
plastic transport mechanisms. Recorded and bulk erased, the
record'pretect tabs have been removed and therefore, need to be
taped over to re-record. Audiophiles will appreciaJe the wide dynamic range of this tape
If your cassette deck has a " metal" setting you will hear the difference. A real bargain!
CAT#a6ooM $1.25 each
10 for $10.00
CASSETTE STORAGE CASE
Black, unbreakable plastk aucGo
cassette storage case.
CAT#CBOX 5 for $1.00 ■ 100 tor SI 5.00
CABLE TIES
TR-400
TR-400e
TR^O
TR^OB
TR-SOO
TR*800B
TR-tlOO
TR-1100B
TR-T500
Heavy-duty
TR-1S00HD 15"
4"
&'
6"
8*
8"
ir
Il-
ls*
Mn.Tmll
ISfbs
IS lbs
30 Ib^
30Jbs
50 lbs
50 lbs
50 lbs
50 lbs
50 lbs
IS^cabte
120 lbs
neutral
black
neucrat
black
neutral
black
neutral
black
neutral
tie
neutral
15/16"
15/16'
1 t/r
1 vr
1 3/4-
1 3/4-
3"
3*
4"
4 1/4-
30
.35
.50
,50
.60
.70
.70
.80
SI .00
$2 50
S3 DO
$4 00
S4.00
S5.00
S6.00
$6.00
$7,00
$8.00
$15.00
$17.50
$30.00
$30.00
$40 00
$50,00
$50 00
$60,00
$70.00
51,50 $1200 $10000
D.C. Wall Transformers (all are 120Vac)
VoltM
4 Vdc
6 Vdc
6 Vdc
7.5 Vdc
8,3 Vdc
9 Vdc
9 Vdc
9 Vdc
10 Vdc
12 Vdc
12 Vdc
12 Vdc
12 Vdc
14 Vdc
15 Vdc
Amps
70 ma.
200 ma.
300 ma.
400 ma,
10 ma.
200 ma.
300 ma.
300 ma,
500 ma.
100 ma.
500 ma
800 ma
1 Amp
700 ma.
400 ma.
Piug Styf^
2.5mm co-wt
1 .3 mm co-ws.
2.1 mm oo-ajc
1 .3 mm oo-ax
battery snap
2.1mm co-ax
2.1 mm co-an
2.5mm co-ax
2.5mm eo-ax
2. 1mm co-ax
2,1mm co-ax
2,1mm co-ax
none
1 .3mm co-ax
2.5mm ^ax
Center
negative
negative
positive
negative
positive
positive
negative
positive
negative
negative
positive
negative
negative
DCTX-470
DCT)C-621
DCTX^Z
CX:TX-7S4
DCTX-8310
DCTX-920
DCTX-932
DCTX-931
DCTX-1050
EXiTX-IZlO
DCTX-125
DCTX-1231
DCTX^121
DCTX-1470
DCTX-1S40
Price
$2.00
$2.25
$2J5
$3 25
$1.50
$2.75
$3.00
$3.00
$3.50
$2.50
$4.50
$5.25
$6.50
$5.25
S4.50
Style
C
c
c
c
c
c
c
c
c
c
c
c
A
c
A
11" X 4" Glow Strip
Powerful Magnet
1 r X 4* electroluminescent
gtow strip. Great for control
pane^ badUighiir^ orspeda!
effects ligtiting Operates on
120 Vac, Salmon cotof.
9* loog wire leads
CAT#GS-110Q
$5.25 each
CALL OR WRITE FOR OUR
FREE 60 PAGE CATALOG
WITH OVER 4000 PARTS!
OUTSIDE THE U.S.A. PLEASE SEND
$2,D0 POSTAGE FOR A CATALOG
Pcwer^l neodymium
rafe-earth magnet
Origimlly tor use In
permanent magnet
dc, motors, in'egular sbape. Approximate
cimension: 1 1/4" x 3/4* x l/T thick
WARNING - Don^ put your hand
between magnet and metal obje<^s.
CAT* MAG'2 $7.50 each
Styte A
Style
TOLL FREE
PHONE ORDERS
1-800-826-5432
MAIL ORDERS TO:
ALL ELECTRONICS CORP.
RO. Box 567
Van Nuys, CA 91408-0567
3
CIRCLE m ON FHE£ INFORMATION CARO
60A61
0 HITACHI
HDDEL I
V-212
REGUUR
J52S.00
SALE
$399-95
KOKM SMI
¥*fi60 ftO »tU. Qui Dumtt, D«r«y«^ Smq.
CAT tetifinit tW.m IW.H
m Ui€tyu% Cursort. Counter U4S,00 128§.9S
V*106a 100 mi. Dual Chinn«U D«1iy^ Sveep,
CRT Ftvtdaut liU.QO
V-10«» IDa Wt, Duil ChinneK Ocliyed Si>«ii frequency PRICE
count*r, RS-232 v/m^l Support H^S.OO
VC-604SA 2 Ch, 100 mz, *0 , lOO Wl tflulv- QUOTtS
iltrtt finplfng* < rv frtttuency
counttr. f&-nt hiyKPa lupport jm.OO
n-sm 4 ch. too itiz. 100 m/i n cui* 4
■•n, totinter, RS-2J2 WHPfiL tupport 439^.00
ve-fim 2 ch, 100 )t{z. 100 m/i n cti). 4
tiJtinter, J5-232 WHPSL Support J995.00
INT
8931 Brookvflle Rd, Silver Spring ID 20910
800-638-2020 * 301-587-7824 * FAX 8ftO-545-0058
MAXTEC INTERNATIONtAi. CORPl
In-Circuit And Out-Of-Circuit IC Tester
HODEL REGULAR SALE
560 Special $3500.00 $2595.00
* Includes AK-560 User Program-
mable software, ($495 value),
and model #2520 Digital Stor-
age Scope, ($1493 value), at
NO CHARGE!!!
560 $3500.00 $1995.00
* Includes AK-560 at no charge!
2520 $1493.00 $ 695.00
8931 BrooVvflle Rd, Silver Spring m 20910
800-638-2020 * 301-587-7824 * FAX 800-545-0058
I
V}
m
QACL£ »4 OK FFtEE IHFORMAT10M CAFtO
CAD (Circuit Analyzer & Designer) VERY AFFORDABLE BREADBOARDS
These CADs have eveiythfng you need to design, test and analyze
circoits. They've been adopted by major colleges across the U.S.
i i3 f
TD1 07 $159^^ TA1 02 , $1 49
,95
• regulated +5VDC & ±12VDC
• IHz/TKHz/IOOKHzdod^
*togicprct>e
• 0.5Hz/500Hz pulse generator
• 8 data switclies 1 8 logic L£Ds
> 2 complefnentary k)gic switches
- 3 breadboards (1380 tie-points)
eicparxlable to 2020 tie-points
Buiftins inciude:
* ragutated, vanable ±15VDC
•t5VACaJKi30VAC supplies
* sine, square & trianguiar wave
generator (2O0Hz-2OOKH2)
* 1 K n and 1 0OK a potentiometers
•speaker
* 3 breadboards (1360 tieixiintsl
expandable to 2020 tie-poiffls
Modei Ckjfitact Bimfg Acces. Your
J^p._ Points^ Posts Parcel
Cost
SBIOO 100
0
no
$ 1=»
8BS40 640
0
no
$ 4«
8B740 740
0
no
$ 4^
BB840 640
0
no
$ 5*^
8P505 1.620
4
yes
BP610 2,230
4
yes
$2499
364 0
BB840
DIGITAL CLAMP "AMP-VOLT" METER
Fax. call or circle response card for FREE catalog. Minimum order S25;
mintmum S&H S5 ($S/unit for CAD): CA customers add sales tax: POs
OK tor qualified a ccounts: send order with check or money order to:
^^^^T^ JPC International. Inc,
WfTJ ^ P-0. Box 55, Agoura Hills. CA 91 376
^ Tel: 818/707-1514 • Fax: 818/707-7327
Unkjye damp-on voltage test fead
design makes measunng voltage
just as easy as measurif?g current
MC500......$74*=*
• measures up to 300 Amps AC.
750 VAC and 2K ohms
• Tuggtdized construction
' contEHuily beeper
• data hold
■ hard leather carrying case
• overload protection
• low battery indicator
n
damp-on
voltage test
lenJ
60A62
CIRCLE 2S7 ON FREE INFORMATION CARD
ALFA ELECTRONICS
QllAUTY TEST EQUIPMENT
AFFORDABLE PRICE
DMM 2360
$129,95
DMM + IjCR Meter
Mast VeisatiU DMM
InducQncs: IpiHOH
Capacrtiix»:
Fi^tncy: iHz - 4mi
Tofrpsfatura: 40 -
Logic TesT: 20MHI
Diode, CoramyJty
VoK, k^, Ohm
3939 count c&spEiy
Aula powof o(f
3 ^1
5: J
DMM 175A $67.95
DMM unth 20 MHz
Frrquenc^ Counter
Most papular DMM
KV JmV^IOOOV
ACV ,lfflV-7S0V
ACM>CA .ImA-lOA
Cip IpF^^
m logk SO lyi^z
Tmnsiow HFE teti
Dodo m
LED
3 dgk dmmy
10 MQ hp^nctt
Fluke Multimeter
fyim 70 N S&2
Fkjhfl 73 1 567
Fluke 7S 1 $m
Fkjka 77 a $t45
Ruke 79 |] $165
Ftuki 63
Rukfi 85 $255
Rukfi 87 Tme RMS $285
Fluka 86 Automotive $359
Ruka 8B $419
LCR Meter 814
$199.95
The Best Hawlheld
LCR
Resisanct1rna-?QMa
1% basic iocumq
DiSSlpitton CKtor Wca' ' * ^- ^^
ti capidtor and 0 fac
ZefO adjusmiflfl lO lea^^ para;,
tics trofn lost rbmira
Very good t&f high fftquaficy RF
and «urla« rrw^r* cofipwi^nss.
LCR Meter 195
$119^5
Venf popular LCR
CipKtmiLlpF^ |iF
Te$t hw|j«flcy 1 kK£
h4JMU| Capacitance Meter
tMm 7705 $57,95
- ai pF^.DOC|LF ki 9 f^nges
05% basic sccMficy
:f' J ZsTO adlusijnefi ± ZOpF la __
saii p^irastjcs rrem tea ftdiut
K«ovy duty DMM
AC/DC cJomp m&i©f
1b«fmoni«r«rp Lux meler
Ugh votJog^ pf(>be
JK: oicUlotof
E«ctTonlc scale
20 MHz Oscilloscope with Delay
Sweep PS-205 $429.95
Dui Trace, Conp«Wl t»$i, r CRT. X-Y G^aibn, TV
rl, ito Ban prica «ti My srap
PS-200 2OMH1 DUAL IRACE $339,95
PS-IDS AQhmi DELAY $569.95
PS^OS 60mz DEUY $769.95
20 MHz Digital Storage
Oscilloscope DS-203 $769.95
2 K Mfd p«f cfiannti fteag*
Sis^inQ am 10 y s«T)pti futQ
Tlmebast lOms^Jv - 05 &U!v
0^ m
Power Supply
PS^aoa $169J5
0-30 VDC , MA o«fpwr
0.02% t 2niV ma mgii^m
002% + 3mV load mgulatbn
1 mVrms mfe* and rippte
ShOfl circLilt and overload pniloaod
Power Supply
PS-1610 $299.95
0*15 VDC , O-lOA output
Constant wtagi & ooostari cun^ nioda
02%+2rrV ling ragutatidfi
004% +?mv k^d fltgoiatton
irnVrms noise and rtppla
Shofi circuli and owertoad proi^d
RF SIGNAL
GENERATOR
SG4160B $124.95
100 kHzoBOUHr Mwm &
Oupol IDOmViRis 3S UHe
imr^ Ihm, ExftmH SOm-aicKE
RF SIGNAL
GEN./COUNTER
SG-4162AD $234.95
GeneraiDs RF ^flnal sarw fa SG-
'1160B
Fmquency counter iHi -150MH2
Senslivty <50mV
For iniUTUl and txutitml lOLiicds
AUDIO GENERATOR
AG-2601A $124.95
1CIH2 ' 1MHz in S argBi
O^Kjt: IV^ 1^ ioV[>p KiuaiBviwt
SyniwMon: 13% Qi osdbiOA to-
OU^tf AMni: Oj06% SOOHz - SOtHZ
05% SOHz - 50OiHr
Ou|Ki biptilinci: 600 ohm
AUDIO GENXOUNTER
AG-2603AD $239.95
Omrmt ludb signal sama as M>
2601 A
Frnqudncy eountor lH2-l504MKc
SeraUvfiy <50mV
For Intomil «nd %mtm\ sourtds
FUNCTION GENERATOR
FG-2100A $169,95
Bjuam. viang^, pdia and tainp
Oupuc: 5ioV-20ypi)
OC oflMI ± 10V
VCF: 0-10V cortiol li«qu«ncy to 10001
FUNCTION GENXOUNTCR
FG-2102AD $234.95
Ganarws ^mA sa;n« ii FG^^iqqA
fmq^i^npipmm 4 dgls
FiMttjm tn aft! CMOS o»jlp*Jl
SWEEP FUNCTION
GENJCOUNTER 329.95
OiMHz la 5 MHz
Sweep; Un 10:iyLoo 10^ 20mS lo 23
m Modyta^n
Ga»d Bw^ Votaoa Cortiol Genef^,
Ganerator Cmol Volaoa & G d^ Cou^r.
ALFA ELECTRONICS (SOO) 526-ALFA/(6Q9) 275-0220 ^5i>^YmmiBACKmmm^ ^iEmmnn^wt
o n RHY flnaa DriTiroInn WlflQiLl f AX: (609) 275-9536 WRfli for free CATAlOa P»aSSUaj£CITqCH«|(;E
bUA tJUtjy FnnceiOn, NJ mm visa. Wasler card. American Express, cod, Purchose Otder welcome
I
CtflCLE 213 ON rR€E MFORUATKM CARD
60A63
MIXED-MODE
CIRCUIT SIMULATION
^ CABLE T.y.K
DESCRAMBLERS
FALL SALE
ALL Bmnis
- 1
r>
2()
SB-3 £93^
69
57
53
47
TB>3 lUffljfPI
78
58
54
48
FTB-sliljQGfflil
79
59
55
49
SA-3 QSQQSS
79
59
55
49
JERROLO DPV7
CALL
CALL CALL
CALL
PANASONIC
87
74
69
65
ZENITH
CALL
CALL CALL
CALL
Dealer Pricing? Pfic^sai^ettTaQiange
MONEY BACK
GUARANTEE
Please have MAKE and MODEL used in your area when calling.
Anyone Implying Thett of Ser\'ice Will be Denied Assistance.
We Have The Best SERVICE AFTER THE SALE
CNC Concepts Inc. wdmn. sales
P.O. Box 49503
MPLS., MN 55449
1 -800-535-1 843
ENTER WE FUWREOFELECTmiC DESIGN!
TopSPICE'
The affordable,
True Analog/DigitailBehavioral
Mixed-Mode CIrcuil Simulator for PC
• Simulate circuits containing any eombinatioTi of
analog and digital components. • Complete SPICE
analog simulator with extended syntax. • Fully
integrated event-driven logic simulator. • Analog
Behavioral modeling using arbitrary equations,
Laplace transforms and look-up tables, • Analog and
digital model libraries. • Graphics past-proeessor,
• Comparable to professional systems costing
thousands more!
PENZAR
DEVELOPMENT
P.O. Box 10358
Canoga Parte, CA 91309, (816) 5g4>0363
To order your copy call
800-272-0674
Pax (818) 340-6316
I
o
2
I
LLI
CODE
RBs«2 POWER SYSTEMS
ALL SYSTEMS IKCLUDE
'* MoChcrboaid
• RAM
•Owe
* Pijwcr Supply
•Keyboard
aiui accessories. , • i^m™
PaAT COMPATIBLES
* 1 33" IM MB FlofjpjT Drive
* I 5,25" 1.2 MB Floppy Drive
* 1 105 MB Hard Drive (IDE)
* Hard Drive CootnQllcr (IDE)
* Floppy Drive Cootroiler
* 2 Serial Pdrti
* 1 PSirallel PozX
* 1 Game Ptiil
* 14" Monitor
" Video Caid
* Mouse
*Windcnvs'™3.1
* DOS 5.0
* FCC Approved
* i Year Wajraniy!
Technical
Assistance/
Custom
Quotes
VIA FAX
Most configurations available on
request! Choice of desktop or
mmHov^er case. Additional RAM
available on all systems!
SVOA Ktmt^
2MB RAM
$1454
SVOA Modfesr
11566
SVQA Mcnrta
11614
smi
SVGA htdcuv
1M» RAM
$1974
£2071
MUTHEhBOAniiS.
ECS
mOtTAM
IMK^-TO SIMM
LXOC9 60 S&tM
4MX¥.1^1 SBIM
:.WCI « DftAM
MKX44E) DftAM
^5«1CXM0 MAM
$4^
141
OAK HfUhWt*. 25fiK U*i
OAK IM. HJlli^M. S12K S7*
PARADISE J(>;4i7r>a, H6K S16
PAimOESE mixlf^, MiK.
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PAJtAEMSE I034^m IM. ^^J IN*
MEKixjft iOT4^7ftit. m m^cni
MOrtOORAPHICS CARD m
SVCiA.iaS4^7ftS. mpP. Nl SJ64
svcA.io;4t7e>i. 7tx». ifa S3i5
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onsoN 4,11 E?cr
IRWIN I ?n ST I J
mw iti \ PLUi 117^
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DOS ^ 0 ^
WrNDOWS™* J.I UPGRAHE M'/
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FUJmU 4700 TACTILE
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UTHM tOI UGCHA?flCAL V44
FmWTEJtff ifffCdJmJti
Hi^\OV LASER SEJ^
U'1JD9 UATKIX »I9
U-IJ24L MATttOC S28t
DESKnW W.PS SM
MINI TtlWEE W/FS 596
MED TUi^ ER W T»S ItW
FULL TTT* Eft W PS 51 J*
1400 BAUD JNTER.NAL
14CD BAUD EXTER.'^At
3400 rffTWV SEND. BO' FAX
5Wa> E\T WJSEN&ftCV FAX
I44ciO ECT w.^tSO.IlC%' FAX
XTi\T s^:
EASY TUWHt 1<2
rULLTDWIK tfti
AT
C&T
5x:y siiy
S \ 2 A S144
SIM
D40
9K)0AM-5:00PM
PACIFIC miE
MON.-FHI.
C£?4tUSCLIX N€T RESPONSIBLE ^ i)^^ ji^fc i J
lf^F0:2Q6-e63^5939 ORDERS ONiT:106^99-7028
jow ppMuMi, WE ALWAYS
ifKt la ■ I5.1t
Wt stit mh gVAinr OEMS,.
FAXtORDfRS^QUOT€S>:206>878^796
60A64
DRCLE 296 OH FHEE WFORIIATION CARD
UL Standard
$igg95
High Performance
GREAT
VALUE !
S^ndard FBatura$ * IModels 100, 150, 200 & 400
• AC 4 DC VOLTAGES • DC CURRENT •RESISTANCE
• CONTINUITY TESTER - Bmzer • DIODE TEST • 3 1/2 DiflliLCD
• LOW BATTERY INDICATOR • ACCURACY +/- 0,5% RDG
The Ultimate Wleter
TRUE RMS i LCB "Ml - dBm.
aMTlBVTEST TRAWSfiTCmtfi TRANSISTOR IfE
BATTERY TEST CAPACrTANCC
KELVtH
I ftODOIT
100 Basic
$1995
KSLVtN
150BasTc4^
$2995
AOOCCURPEMT
KELVm
t»0091
200
»3995
Protective Cases
For PJodets l&O, ISO. 200 *4.^^ r«oe3S>
Case For Model Pro 400 ^9>^^ ttwcB^j
20MHz FRB3
COUNTER
ADDCCURnENT
GAPACITANCE
LOGIC TIST
IH)TEST-
V^VYGDQOAAO
K£LVIH
PRO 400
$6995
Standard Featums - Models 92, 93, 94 & 95
• DC/AC VOLTMETERS • AC/DC CURRENT • OHM METER
• FREQUENCY COUNTER to A MHr • AUDIBLE COSTTlNUlTV TESTEH |
• DIODE TESTER • MAX/MtN AVERAGE MEMORY RECORD
• RELATIVE MODE • 10A HIGH- ENERGY FUSE PROTECTION
• DATA HOLD • AUTO SLEEP A AUTO POWER OFF
FBRfOmiAHCE^
llod«l 92 • 000109
DIAGNOSnC^
Uodil93 #900110
$14995
ENQtHE ANAL YZER ^
llodil9l «S90112
$19995
m m'mm uitivt dc/k
750'^ ^
WATER RESISTANT {52 A 94 MocMl Ofify),
2 YEAR WARRANTY, YEUOW HOLSTEB.
PROBES, battery; FUSE. STAND
LOGJC PROBE. CAPACfTANCE TESTER.
TRANSISTOR TESTER. TEMPERATURE
TISTER A K-TYPE PROBE. HJGH VOLTAGE |
WARNING BUSER
Comp^Eir wons Development Systam)
with the R-31J board providea a compile ha/dware/aoftvvare de-
velop me nl and debugging system irt one user-friendly menu-
driven environment which runs on a ISM PC host.
m
programs In the MCS-S1 language may b© written, edited, as-
sembled, downloaded and debugged without leaving the inte-
grated environment Its advanced features such as extensive
menus and on-line help makes it ideal for beginners. The prof^-
siorkal features, such as alternate hotkey operation, source-level
debugging, history files, and a powerful cross-assembler makes
READS / R'3i J an industrial* grade development system.
Hie R-3t J may be populated with Intel's 8052 Bas?c chip and
software written in Basic for those who prefer tt
READS/R-31 J with User*s QukJe on dtsk and example programs,
is phced at $130. A kit is available k>r $95. Add $30 for the hte I
8052 Basic chip.
RIGELCDRPORATtON
PC Box 90040, Gainesville FL, 32607 {904)373-4629
CiRCl,E 307 QH FREE INFORMATION CARD
Electr(>nk' Enclosures
Comptete line in Alyminum, Steel & ABS
Also Hardware. Silkscreening^ Hand Tools
Ask us about our Custom Fabricating
Call for FREE Full Color Catalog
{800) 800-3321 (216) 425-1228 Fax
(Project Pro]
PMI HMT.RPRtSE. PKW V rwlNSBLKO UtI 44l^s7
CinCLESDS ON m^B INFOnUATIOM CABO
Si
Si
Spice^
ANALOG & DIGITAL
Circuit Design & Simulation
far Microsoft'^ Windows and the Macintosh'"
Logic^
* FUt 1«l
ITS"
lEiAiEr
IA1 »Mi«
WT
TRANSIENT, DC & AC ANALYSES
OVER 100 COMPONENTS
• INTEGRATED SCHEMATIC CAPTURE & SIMULATION •
Now in use at over 20 major universilies and leading corporations around the world.
• $130 /ea.
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Beige Bag Software
eOA66
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Ph: (313) 663-4309 • Fax: (313J 663-0725
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5^
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CONVEBTERS. DESCBAMBLERS & MORE AT WHOLESALE PRICES
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DE5CRAMBLERS
5
19
n
NEW TBI (IMPULSE)
SS5.00
$60,00
$55.00
CAIL
TB-3 OR 2
$5000
$40.00
CALL
FTB-3 OR 2
$65.00
$S0.00
CALL
SA^B
$65.00
$45.00
$40.00
CALL
SB*3 OR 2
$55.00
$43.00
$3a00
CALL
SA3DF
$99.00
$94,00
$89,00
CALL
OAK N 12
$49 00
$43.00
$36.00
130.00
•ZENITH NO-FLASH
$139.00
$129.00
CALL
CALL
•HAMUN 1200 CH3
$65.00
$45.00
moo
$30.00
CONVERTERS
PANASONIC TZPC 145
$75.00
S65.00
160,00
CALL
STARGATE 2000
S70.00
S6S.00
160.00
CALL
JERRQLD DQN-5
SS5.00
S75.00
CALL
CALL
JERHOLD DQN'V? uA^lume
*JERROLD DRZ^SO
$89.00
$80.00
CALL
CAU
$59.00
$49.00
§45.00
CALL
'SVLVANIA TEKSCAN 4040
$55.00
145.00
$36.00
CAU
(CH. 2, 3 OR 4)
^REFURBISHED AS NEW. CONVERTERS AVAILABLE
IN CHANNEL 2 OR
3.
COMBINATION
UNITS
'SCIENTIFIC ATLANTA
CALL
FOR AVAILABILITY
AND PRICING
PIONEER
S329.00
1299.00
CALL
CAU_
JERROLD BASEBAND
S329.0a
1299.00
CALL
CALL
JERROLD DPV7-212
'JEHROLD DP5*DPV5
$249.00
$239.00
CALL
CALL
CALL
FOR AVAILABILTTV
AND PRICING
'JERROLD DRX-3DIC
$109.00
I«9.00
CALL
CALL
'JERROLD DRZ-3DIC
$12400
$109.00
CALL
CALL
•SnVANIA TEXSCAN 4040-DIC
$75.00
$69.00
CAa
CALL
(CH. 2 OR 3)
*OAK M35B{Wf™VARI^YNC
$44.00
$39.00
CALL
CALL
ADD 110.00 PER UNIT)
'REFURBISHED AS NEW.
OTflEB PRODUCTS AVAILABLE: REMOTES; JERROm PANASONIC, HAMUN, IDCOM, SCIENTIPIC ATLANTA.
INTERFERENCE FILTERS: CHANNELS 2 OR 3 / VIDEO mPE ENHANCERS. AC ADAPTERS 12 & 16 VOLT / ADULT INSULT
BOXES / MORE. FULL SERVICE TECHNICAL SUPPORT.
COMBO SPECIAL - NEW TBI AND WIRELESS CONVERTER $150.00 [5 LOT QUANTITY)
NO MINNESOTA SALES
PRICES SUBJECT TO CHANGE WITHOUT NOTICEI
i^ffTT Of seiMCi If A cmm. wsimxatG aky p^vicc wmtocrr rtMNissiOM nuy s^^bject to civil on ookihai. p^altica. mm ch£CK mm vour loom, owe ccmmirt amu
FOM AUiCKVlCIl VtHJ U«C. IT tS NO? TXC tmOT OF LAKKfiVUMN MU« TO DErHAUU AfCf Ttt£V1$K>N {>r^ltAmH ANP WI Vittl TtOrt ASSISt ANY CDMMNV ClM IMtHVI CMjAl Ifi DOMCl Ttf£ 5AH£.
CIRCLE 250 ON FREE INFORMATION CARD
Question: Who needs a Zenith Personal Information Terminal?
Answer: With all these features and the low price, everyone!
Afiidi I pnMr vl Hi « 1
• MMi m M irii • ftMil. Ml
• tttfci lir V Mil- • fm pNn Mcli: Im nI •
4tW < 41p )Q MOD Mt
ZTX-11-Z wItK RS-232 $75
ZTX-1-UZ without RS-232 $50
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e
BATTERIES iSS^™"''"
(ALL NEW- MADE IN USA|
ICOM
7Sl3.2v1200 mah SSfl.flO
&$9Jvl200 mah $59.00
BPn3.2v600 rah SBfl.flO
OPe a4vlO00 mah 159.0(1
SA/SAT
BPa2,QPB3
BP83A 7.2v 750 mah
BP84 7 2v 1QQ0 mah
BPB5A 9 6v &0D mah
BPeSB 600 mah
I
■
i
YAESU
vSOO mah lllM
FNB^2 veOO mah 12100
FUi^tO
FNB^tOS 7iv TOGO mah
FNB-12Sl2v600 man
S41IS
KENWOOD
III
PB1 1 2v 1000 mah
KNB4 7iv2200 mah
P06 7.2v 750 mah
PB7 7.2v 1500 mah
P88 \2v 750 mah
$S9JQ
S59J0
IS5.00
S55.01I
SPECIALS
ICOM^SA/SAT
ICOM-72ACHAflG£RWITH
BP^ (Eaurv)— r High
BP45a CEqunt) r Higit *
!2v r^i GOQ MAH
S1S4.IW
MOTOROLA
HT300 7,2v 1600 mah M5.0O
HT90 1?v600 mah 134.00
HT440 12v600 mah nSJO
MT500 15v 500 mah $39JQ
RADIUS
P-IO 50O mah
SABER
7 2v ItOO maJj
S2I.1I0
ISIilO
INSERTS
KENWOOD
PB-21 SI 3J0. PB-25. 26> SlOJa
ICOM
BP-3 tlTJO. BF5 tlZ^fl
BP-7. BP-B
CAMCORDER
JVC
PANASONIC
PVBP80/ae 12v2.3 amps
RCA/HITACHI
Full size
VHS-C
SONY
NP22
NPS5/77
ALL BRANDS AVAIUBLE
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MOTOROLA
•ALL BATTERY PACKS - GUARANTEED TO HAVE THE ADVERTISED CAPACITY
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BATTERY-TECH, INC.
28-25 215 PLACE, BAYSIDE. N.Y. 11360 • FAX 718-461-1978
800-442-4275 - N.Y.S. 718-631-4275
60A68
CIRCLE 2tB ON FI^£E IKFORMATIOK CARD
ELIN
p«d.bi. Micro Tcndifl
Liquid Crystal Displays
16 Ml, 3 for $25*
16 X 2 S8.00
20x2 $12 00
24 X 2S!2 00
32 X 4 $20.00
40 X 2, a fof S25.00
40 X 4 $25.00
4x2 S5 00
5V power roquired • Busir In C MOS LCD driver & controller •
Easy 'Microprocessor' interlace • 98 ASCII character
florterator • Carrain modefs nro biickhr, calf for mam info.
' up LCD dsptay {^16 VDC) ■ Can comnunic^t wfh
any conput^r having RS 232 pOft * Can communicate
with anoihsr Microiftrminal * Use by ilself as
Bteafonic noieisook • Orboard miCTOpfocossor,
dma RAM ^K) and Vktee RAM (64K) • Cont^
burit in dtagnoaitcs and up capabiliiiai • Original jl^^
ifimtkKi for POS applicaiions. < display siia 40x1S (256 x S99 j
128 piels.) Dtfti: 6.T W, in,2H. (W^th LCO ipheigM « 7.1") ^
00
D^6"C0L0R MONITOR @^JJXD
Fmx^i* * wo x 2M 0(j! KMbtion • CCA 4 H*TtuI« Cmnpttibtf' • 12 VDC
■iti^fi * 1S7S KHi Ilcm/. R«. • 60 Hjt Vm. Svnc R^. * tJwti Fitmr Cmanjrti«i
MAGNETIC CARD READER $25,^
V^udof : • 20 chofoctor dof moinx diptoy v^\h tiM dpho-rMTiftfte
CQpcbtjtTy M k&yponel \*^tti fiil cJp^tonLmwte entiy * topofoto 7.5
VDC/0 5 Amp pcwo* iLpp^ • iTaTcicrd tolephom Intoffoco dXtomJofi
cold • liihiL^n botloryf ond Hot-com
TesfcBencil Bystem $129,®
286 - 12 Compyter* IdtaJ for Ihe handjinan, great for the t^tbtndt
IIHPRO*^^ LITTLE BOARD PC $79 «
U^MT4iifl€ ta tm o;> h!^i4 {251x9 - OpUoul Hofipy
port * Itybu/^ ii^ut i Spva)*r (httjnt • lu SCSI opntroUtE fecktt •
IfBquirc* o^lonti p*l I QQRtroHcrJ • ^dmj4 U tlif tit" pf i
flqppy drive.* Virru^iy atA jupf»?t 4vUIa2:i1« ofily lr» TikIIm.
ADAPTEC 4070A(RLL)or4000A (mfm)
SCSI Controtler, your choics $60."
i LASER DIODE: Sharp pan#: LT022MC 4
IRMA BOARD sbtt $99.°°
Unitj3370 mainframo sysferm to r&W PC
MagnavoK EGA Color MonHor $150.00
,39 (M plch. MoM I3CU053. EGA cant M'liU*
360 K
$35.""
720 K
$55«
K44 Mb
155.*
Single Board 38fi Compttters
M&IlcaiB« w pold (^OQ Ifi
icriil and pflntTSporti. ipUu »
and come with iMh of cnit^mory on board.
(H«ir Hvlfht. Co«^tlbll«}
10 gnd 40 Hb tDC ddm - tot ^vl
AAA 640 z 200 LCD $29 «
corrputar. DfMf boord )b Qerwt^A tsEKt trd qtV^^
i«t tY:JuSod. TH$ fa a Mrtd rteffbcti LCD. You itokic ba
Sony Trinitron
r Enclosed COLOR MonitorSMS
640 X 400 LCD $50 « s^,^patim7f
UodAl CmSOdO • 640 ac 200
i^wlutkm • 20 dot pitch •110 Voll*
(cotwfiot&t t3 RaS input - € ptn}
HON ENCLOSED TTL MONrTORS
Comes Vh^th phout. 13V at 1 4 Arrp Irvxit. Mm\d
fr equercy 1 5 lOiL Ab% to do C oxl eo coUm.
Black & White.. ..,.,.,,$35.00
7 inch tmM WUQ $29.9S
9 inch (Ambor),,,, $29,95
Piottofl Piol(at-4 Modal pl34T
TokM Riny Board $7g^u
U bJt * 4 Mbps * IEEE 802.2 ^x\d 602.5
compaUbte • twisted pair • inlcropcr-
able with IBM Token Riiig network
Graphic & dlphonunisric
Uqold Crystal Display
4S0 Dot z 128 Dot, (SO X 16 Unc)
15," emoh. or 2 for 20."
Driver bo«rd AvaiUble 860.00
irPipirWhiliVQAitonKorindeifd
incmcilble $99,^
VGA rTx»nltof Mparal* S65.00
VGA cvd Mpmta .„.^3i.00
h}oto: S/G'A cord wtH not opotit^ In a ^86.
rhe Spy In Yhe Sky
1728 »1«ffi*nl CCD
$19.00
4096 «t«m«f^l CCD
-.v. $29.00
^ Laser Printer 645 « ^
Scanner Assembly
pdyfiz] m^LEE- |S riektt and ale. cifiClai tni kswa.
HeNe LuerTube •lOMur (rmx. outpuO SW^*
101 tt#y XT kevboaf(f._. %UM
as k9t XT/AT k#¥b'0/^PfWV?^MiN'AIU?^E SUk-ACH MOUNT
TKANSMnTERS MAVE CmfSTAKlEAR SOUND.
Z5-TURNTUMNG!SSTAaLE, RA/^EA30UT SOCFT
ROOM MICROPHONE VERSION IMC4FS39.9S
AUT&SWTTCHmONE VERSION IMC4T $39.95
International MicroPowffr Inc.
CamarlEo, CA 93010 * V.lv* .
1 -800992-35 1 1 ^^-^ I F J,)
CDftDEftS ONLY MC 0? TOA Acoeptd
Sorry w« do NOf prst a ojdoa'
56 PAGES - EASY
TO UNDERSTAND
CALLER I.D. Guidebook
INCL 8 PAGES OF
SCHEHS & DIAGRAHS
60A70
ORCLE 24« 0#| FREE JNFOAUATION CARD
B & S SALES
5 10
PANASONIC-145 CONVERTER $60 $57
TVT-3 DIGITAL TRIBI ADD-ON 51 48
For most Jerrold systems
NEW SCIENTIFIC ATLANTA 8580-338 185 179
Converter/Descrambler
NEW SCIENTIFIC ATLANTA 8590 250 240
REFUR JERROLD STARCOM 6 {DPV5) 155 149
Converter/Descrambler
REFUR HAMLIN 6600 05 600-3-M 65 55
MLD1200 Built-in Converter/Descrambler
HAMLIN-MLD-1200-2 25 20
REFUR JERROLD DRX-3-DIC 89 79
Built-in SB-3
MISCELLANEOUS CONVERTERS
NEW ODD LOT $50 USED CR6000 29
NEW TV-86-3 USED DRZ-3A&B 49
NEW EASTERN-3
NEW STARQUEST-3
MISCELLANEOUS
Jumper Cables, Remote Control for most cable Converters; Interference Filters or any channel.
90 DAY GUARANTEE — in order for the 90-dav guarantee to be in effect, this form must be signed and returned.
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signature Date
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CIRCLE 217 ON FTIEE INFORHATION CARD
60A71
t THREE amEAT mgPUCTS FmۤM^
IVIC200
'EASIEST"
MC3CI0
"POWERFUL
MC400
MORE POWEBFUr
$159.95
CAPACITANCE METER
This hw To tw ifw
wortd to c^rnmn. Ttm I
r'(m taiAxiinQirw
to 1 VARAD mFj
B^DflETRON
■■^ (4t©J676^1600
« Olv. Of aeraafoa TachnorMimi Inc*
935 the CiueenBVfPVt Sox S4i
ToFwito OitlArlo. Canada M8Z SYi
$249.95
MULTI CAPACrTANCE METER
■ Jes
ilCi
* Al unls hive ■ 4 U dgiq km^ LCD tlsfriiy. clDdi cJampad ^ Ut ^i^^iM vnj.
COMPONENT ANALYSCI^/
CAPACTTANCE MgTEB
* jJWtJtf INI I JW te* o< flTM MC-KX
Put- tx u
PLEASE SEND ME:
QfTY
MC200
MCSOO
yc4oo
CASE
HZ AC ADAFfOR
a s- Fimos
PAlfi Of TEST LEADS $1195
sfif^ iu^D mam @ 7j£^
f I cm [ ) VISA mh.
I mwwy enter f J t
LI CAHONO,
QL DATE ~
aCKATUt!!
HAME
ADDRESS
STATT"
::2ip:
TlLEPRMEmZH
Oedll Cerd ajtEOTTKn, w like to ship to tw ad-
dreea itwt crodll card Is roglslafed Iil 7Mi^
DEALER ENQUmJES iNVFTED
I
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1
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The Pocket Programmer
Iht portable Eprom programmer thai
uses the printer port of your PC instead
of an intemal card. The sofiw;ire has 24
easy to use functions and programs
27/25/28/68764 & Cmos from 16K
{2K X 8)— 2M (256K x S) Eprams
(32 pin socket, UpGradcable to
SMeg). Adapters avtiilabk fur MCU's,
40-Pjn Epi-oms, 5-Gang and Eprom
Emulator to 32K x8, (TI^AI^r
[NTROMCS, INC. Ipli"*"^
BoJt 13723 ^^ ()Q 1^,^ ^kipp\n^,
Edwards V II k% KS 661 B Md Si . 75 far COD
( 9 LI I 4 2 2-2094 Visamnster Ouir^v
B.S. & M.S.
In Oomputer Soience^
' Approved for tuition reimbursemenl by
leading companies
* ALL COURSES THROUGH HOME STUDY
* Increase your
earning power
* Approved Ada course
available
For tee information calf:
1-S00-767-2427
AMERICAN
[NSTtTUTE
COMPUTER
SCIENCES
Prototyp
r
F 1
i . . !
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$99.00 ^
RADAR
Kustom MR-7
moving /stationary
PROFESS/ONAL MODELS
usedtypoUce and tasebaii scouts
Grsat selection of new, used, and reconditioned high
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ranted, $239 and up.
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*'How RADAH Works/' a complete guide to speed
measuring RADAR is available for only S3. 95 ppd.
Ff^E CATALOG * CffSa/T CABOS ^ C OMs
AIS
921 N. Columbus
Spiro, OK 74959
918/962-3349
rJOW - THE ALL NEW URDA?, tNC
SDK-386
TM*
32 an MtCROPROCESSOR
TRAINER AND
DEVELOPMENT SYSTEM
Wtfi QCM^ as^t fto*fcno Cepipocisv,
1B K&qfm fit EPf^ to MontDr. tJMiM «] IJ^
KArwpm ^ChfifMtr A 2 Unt Dot i*&t\t LkMd
Also available:
The 8 Bit SDK^BS
The 16 Bit SDK-ee
Coming En late T992;
The e Bit SDK-SI
Microconirolter
Look haro for 4dG snd 50S products
CALL URDA(g^, \m.
1'SD0-33S-D517 «r A^2^W^^1%2
eoe6 fisooQ esGso ssoso 320\o osp
V^ith Cfoss Assemblsrs for
MS-DOS Computers
a ROLE ON FREE INFOFIMATION CAPn
CB RADIO OWNERS!
We specialfze in a wide variety of techntcaf
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radios. 10- Meter and FM conversion kits,
repair books, plans, high-performance
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customers since 1976f Catalog $2.
C3C INTERNATIONAL, INC,
P.O. BOX 315O0RS. PHOENIX. A2 85046
The Tline Has GGsxie...
...to send for the latest copy of tlie ft-M
CoDfiumer* Informaiton Catalog It lists more
than £00 trm or low cost govenunent
piibUoatlons. Send jour nama aj^d addreisg lor
C03i9V3(b«r Hif ortiLatlcUL Cent«r
Departmant TH, Puablo, Coler*dD 81009
U.S. G^enoriU Services AdnUnlsimtton^
60A72
it:
TOLL FREE ORDER
HOT LINE
1-800-423-0070
PC BOARD HACKERS CORNER
WIRELESS FM STEREO BROADCASTEe KIT
CAT, NO. SFM-JI $19,95
DC'S all now FM Stereo Transmmer
Cit tfl basecl upon the unique BA1404
^ereo Broad easier Integrated CIrctiH
hat Includes all the complex circuitry
o generate the stereo sJgnal- The kit
nciude$ the new special IC, a 33 KH2
^rystaJ, ctreuti board, and all the smail
:ompofieiits , This fee I noting project will provide many hours
>f enjoyment as you re-broadcast your CD/VCR/Cassetto or
^ereo broadcasts from your satellite ftysiem thru your high^
lual^ FM home or auto stereo tyUem,
MAKE CIRCUIT BOARDS
THEJ^W,EASYWAY
wriH TEC-200 filM
JUST 3 EASY STEPS
1, Copy circuH pattern on TEO200
film using any plain paper copier*
2, Iron film onto copper clad board.
3, Pee! off film and etch,
ORDER TEC<200-10 FOR TEN
] FUNCTION GEN ERATOR KIT ORDE R FG2 KIT
~' St9.95
A greaf project to enhance your bench. This handy little ftinc-
tlon generator has a buiJt-ln buffer ampltfierf a 3-decade range
•elector switch that covers 15 hZ to 25 khZ, output level con-
trol and function swUch to select sinei square, or triangle.
PC BOARD SUPPUE5
Copper clad boards
for uso with TEC-20a
^-250 3 x 6 $1.62
P1-36 3X6 2-03
22-260 4 X 6 2^
^-261 6X6 2,88
22-263 6 X 9 4,08
POSITIVE PRESEN-
SmZEO PC BOARDS
^-330 2X4 $3.83
22^2 3X4 4.40
22-334 4X6 5.78
22-336 6X6 7.60
22-338 6X9 9.63
DC*S PARTS WAREHOUSE
UNIVERSAL DECODER (RE MAY 1990) ICs
CD22402E 7.95 CA3126E t.95 NE564 2,29
LM733 .99 74CO0N .29 CD4053 ,50
LM7805 ,50 LM7812 .50 LM7905 .50
ieUh CHOKE ,39 3.5S MHz 1.00
ORDER ABOVE ITEMS DIRECT FROM THIS PAGE
ICL7106EV KIT LCD DIGITAL
PANEL METER NOW S24.9S
The ICL71 06 EV Kh Is based upon a
3-1/2 digit A/D converter that includes
Bll the circuitry to build a digital panel
meter. Operate* from a 9-v battoryi
Includes LCD^ 7106 \C, circuit board
«ind email parte. Builder must add
reaittors to expand to multi-meter
POWER SUPPLY KIT
PS-1 $16.99
□ulptit of ihh powtr supply b con-
llnldu^l^' ncytLslAbte from 1.2 to 25V
OC , The LMM71 voltage regulrtlor
^rov|dp!i cKCfiltnl regtilntion and
■ipplt r^cclton, Includrsi a 1 A
tramformcr, PC board, I*M3l7Ti 2
binding posfji, and all small parts.
MORE KITS
3 DIGIT LEO DVM ONLY 3" X 3" READS 0 TO
t OO V DC ORDER DVM3 $1 9.95
FM W(RELESS BROADCASTER FMI $ 9.95
B038 FUNCTION GEN. KiT FGl $ 9,50
SEQUENCER PROJECT SEQKIT S 9.50
CHRISTMAS TREE PROJECT
Build this unique seasonal project and have
an unusual converellon piece. Powered by
two D cells, 17 LHDs flash In a seemingly ran-
dom fashon. Kit Includee everything except
batteries. ORDER XMASKIT $16,95
7(KWATT STEREO POWER AMP
35 WATTS PER CHANNEL
Now you can boos ylour low power car
stereo with the new PM-35 module kit. Each
module can provide up to 35 watts per chan-
nel whll operating from the vehicle's battery
into a 4 ohm speaker system. New hi-tech
power op-amps are used in a unique circuit
to Increase voltage swings, thus more
powerJ^dditional modules can be used to in-
crease power to 1 00 or 200 watts/channel,
ORDER PM-35 KIT $19.95
UNIQUE IC'3
NE602
$2,00
UCiN3013
.98
ULN2429
1.75
ZN414
2.00
XR2206CP
4.75
XR2212CP
4.75
MAX232
S.40
ULN3330
1-50
1CLS038
3.85
ICM722QBIPL
23.50
DC ELECTRONICS
TO ORDER FROM THIS PAOE CALL: 1-800423-0070
SEND MAIL ORDERS TO:
PC BOX 3203 SCOTTSDALE. A2 85271
aRCLE Zn ON FREE INFORMATION CARD
60A73
Knight Patrol "
Talking Home Alarni Kit
A h\qH end alarm syslam a! &n affordable pric4>!
Features include:
» VffftMUly warm burglars sway
# Sim oT the PCF 8200 Spd«h Syttthesia^
♦ 21 B0nsar Zofi*s. 2 Afming Ctrotits
* 2 Five Audio Amplifwfs
* Auxiliary Alarm
* Bmii Time £4 Hi; Gtodc
• A m & 3A Ratay Ciicutt Stfeni. ecc
t Alad/SSa^ Monllbring lUk^ (v«ftul itBita}
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MISCELLANEOUS
ELECTRONICS FOR SALE
TV NOTCH FILTERS. BROCHURE $1,00.
MICRO THinc.. BOX 63/6025. MARGATE. FL
33063 {305} 752-9202.
REMOVE TAMPER resistant security screws, de-
luxe 30'pc. sol S29.95 plus S4.50 S&H. Send
SASE for more information, Synset Elactronlcif
12145 Atta Carmel Cl., Suite 250-139, San Dteoo,
OA 9212a
pH METERSi Pocket type replaces litmus paper,
auiomatic caNbralion. Monitor swimming pool
drinking water $49.95 each. Free catalog ana-
lytical, flow meters, FDC-RE, Box 221055.
Memphis, IN 38122-1055, (901) 323-0278 Fax
(901)323'04S3.
CABLE TEST CHIPS. S-A 8550. S-A 8500 —
310. 311. 320, 321 (specify) — $33-95, S-A
8580/338 — $69.95. Tocom 5503/07 VIP —
S33.9S. Starcom 6 — $33.95. Starcom 7 —
$49,95. TEtECODE. PO Box 8426-SH, Yuma.
AZB5366-642a
THERMOPLASTIC MOLDING! Muitlpurpos©
mold forming macfiine for project cases, protolyp-
ing, crafts and many other uses. Send Si. 00 for
sampie and mom information. The Formworfts,
PQ Box 72t> Gtendora. CA 91740.
SOLAR PA MEL. used 2 amp $165.00 plus $5.00.
Daltas Solar Power. Box 611 927RE, San Jose. CA
95161.
TRANSIENT SURGE and ground fault protection
now in one complalo uni!. $98.95 S/H $5.00. NY
residents add appr. sales tax. Safety Unltmiied.
1743 Baldwin Road. Yorklown Hts,, NY 10598.
SHORT WAVE antenna, space saver 30 feel 14
gauge copper, ready to use $14.95. Code practice
set, less batteries and key $12.95. Cemp. 4951
Treemont Gircfe, Cleveland. TW 37312.
PLANS-KITS-SCHEMATICS
OESCRAMBLER KITS. Compieie cable kit
$44,95. Compiete satelllle kit $49. 95. Add $5.00
shipping. Free brochure. No New York salts.
Summit RS. Box 489, Bronx, NY 10465.
GUILD OR buy assembled, four diQit SWR &
powe f m e te r, wt th a1 a r set po i n ! s . ians avait-
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432-3049.
BUtLO YOUR own ne^ghtKirhood radio station
with our high quaJity FM stereo transmitter kit, with
case $42.95. Afso svailabte, two meter 144 MH2
power amplifier kit 10X power gain $34.95. Add
$375 SSH. Send SASE for complete catalog.
Sunset Electronics, 121 45 Alta Garmel Ct,. Suite
250-139. San Diego. CA 92128.
TEST AIDS fOf testing units in FULL SERVIVE
mode. Starcom VM, S40.00; Sta/com VI. $30.00;
Starcom DPBB, $50.00; Pioneer. $75.00: Tocom
VIP S 503 550 7, S25 GO; S. A. call; Zenith. $25.00;
N.E ENGINEERING (617) 770-3830.
ETCH PCB'S yourself, new technique, no chemi*
cals. easy, cheap, full instructions. Share fare,
$1.00, SASE, Nicknap Prods., Suite 297, CN
1907. Walt, NJ Q7719.
BUILD — FIVE-digil^ ohms, capacitance, fre-
ency, pulse, mulltmeter. Board and instnjctions
,95. Bagnall Electronics, 179 May, FairfieEd, CT
06430.
ONE CHIP DOES JT ALL, Illustrated guide to
understanding and designing circuits utilizing the
Motorola 66HC11, $5,00, fRI^DEA, Box 6600,
Macon. G A 31208.
SIMPLE SECURITY, learn the basics of alamr
design. Tested plans can be adapted for unlimited
uses. Includes input conditioning, timer basics,
and more. $5.00 TRIDEA, Box 6600, Macon. GA
31208,
VIDEOCIPHERI l/sate II ite/sca n ne r/cab le/a m a-
tetjr/celluEar/repair manuals, modification books,
software. Cata fog — $3.00. TELECOOE, PO Box
6426-SH, Yynwi. AZ 85366-5426,
KEflWOOD & ICOM service bultetins. 175 +
pages covering ail models. $39.95. Calatog —
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343-2141, TELECODE, Box 6426-SH. Yuma, AZ
65366-6426.
DESCRAMBLER KJTS. Complete cable kit
$44.95. Compiele satellite kit $49.95. Add $5.00
shipping. Free brochure. No New York sales.
Summit RS, Box 489. Bronx, NY 10465.
DIGITAL COMPASS — A unique handheld de-
Vice that detects all eight compass headings. Re-
suits displayed by the lighting of the appropri^e
LED. Kit contains compass sensor;. PCB (2X3,5
in); LEDs; resttors & detailed instructions. $26,50
Suncoast Technologies. PO Box 5835 RE. Spring
Hill, FL 34606.
BUtLD A TV and radio jammer! Ultra simple
(parts under $10.00), yet effective. Graal joke for
tnal friend with a new TV or neighbor with the loud
stereo! Plans only S4.00. W.CN,, 3283
Belvedere. Riverside, CA 92507.
UNE NOISE ellminaton Simple plans for mod-
ems. Kills static, Suild for $10.00 Of Radio Shack
Rirts. Plans only $5.00. K&A Enterprise. Box 111.
ampden-Sydney VA 23943.
BUILD FUN electronic games with LEDs and sim-
ple digital ICs. Book has plans for ever 20 games.
Send $9.95 fS2.00 S&H Omegatronics. PO Box
911. Blcomingdale^ 1160108.
SECURITY SYSTEM schematics for eight zona
enuy exit detay controlier with lire and panic loops
S15.00. Plans to modily inexper^ive.readiiy avail-
able device into passive infrared alarm system
compatible detector S5.0C. Both $17.50. V-Tro-
nlcs, Box 620, Rte 3. Kerhonkson, NY 12446.
BUILD OR buy assembled, complete lie detector.
Only $28.75 from Javier £. Baez HEedronics. PO
Box 3151, San Lui s, AZ 8 5349. Wri te u s. rig ht now.
UFO BUSTER! Movel vehicte-based circuit
probes mysterious energy fields thai may interfere
with engines, lights. Sofid theory, compact, easy-
building PEans & data. $l9.95^stpaid. Exciting
electronics! Stack, Box 365. Rooseveltown. NY
13683.
PRACTICAL FUEL SAVINGS for carbutBtad ve-
hicles. Phenomenal results possible, easily and
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tomers. 1 (800J 747-9053.
LED POSTER Art. Add an eye catching lighted
effect to any poster. Great conversatkin piece or
Hell tor profit* Comptete illustrated instructions
with Radio Shack parls list. S6.95* S. SesUto, Box
37BRE, Elmsford, NY 10523.
PRINTED CIRCUIT BOARDS MADE. Single
quantity, low quantity. Low prices. Single sided
tioards only. Send SASE lor ccmpiete informa-
tion. J. Morrow, 500 Ken Merit Rcad^ Ames. lA
50010.
STAINLESS STEEL screws, nuts, washers. As-
sorted kits. Free catalog. Rusty Bolt, Box 708S.
North Attlebom, MA 02761.
WIRELESS GUITAR transmission system. Build
your own for $39,951 ULTRA QUIET FM DESIGN,
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includes PCB and AIL electronic components.
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— STUN DAZER $44.95! SUPER FM OR AM
TRANSMITTER S29.95! PHONE BUG $19.95!
BUG DETECTOR $39.95! RF OR ACOUSTIC
BUG JAMMER $34,951 SUPER SPY MICRO*
PHONE $34.95! VOICE DISGUISER $39 95!
TESLA PH ASOR GUN $79.93! SUPER BAT-
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UNIVERSAL fC TESTER $49.95! LASER
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NI*CAD ZAPPER can reiuvenate those unre-
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Zapper: S5.00. TENTRONIX, Dept, RS992. 3605
Broken Arrow, Coour d Alene. ID 83314.
CELLULAR hackers bible Theory — hacks -
modifications — $53.95, TELECODE, PO Bo
6426-SH. Yuma, AZ 65366-6426.
FM STEREO BROADCASTER kit. This kit out
performs the competition. Trensmitter wilt broad
cast any audio signal from a CD player, VCR, o
cassette player to FM stereo radios Ihroughou
your home and ^'a.'-d. Ail the complex circuitry is ir
the unique BA1404 integraied circuit. Tunabfi
across the FM band, runs on 1.5 to 12 volts DC
Complete kit of PC board and components fo
S24.00. TENTRONIX, Dept. RS992, 3605 Broker
Arrow. Coeur d'Aiene. ID 83614.
COMPUTER HARDWARE
IBM PC and laptops video digitizer, connects tc
cameracordar. 640 by 480 resolution. 256 grffj
leveis $89. 98. Demo disk $3.00. informatior
SI .00. Colofburst, Sox 3091. Nashua. NH 03061
Phone (603) 89M586.
336/486 CPU heat Sinks, patented, best perfor
mance anywhere, u-instalL Send $18.00/1
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14240.
PC PARTS Mbs, disk drives, hard drh^s etc
Overstocks, reconditioned. Mulliwatt Systems
Box 1147, Burlington. MA Qt6D3. (617J 229-9796.
UNIVERSAL MICROPROCESSOR SIM
UUTOR/DEBUGGER V2.0 each set $90.00. Fo
use With PC and compatibles. Simulates the Z80
8085. 8051, 6800, 6601, 6805, 6809, 6811. 630:
and 6502 and 65C02. Features assembler, dis
assembler, source-level debugger. Accepts bin
ary and Intel hex Jomiats. Displays registers am
f fags after execution. Response from terminal car
be saved to a file, includes batch file capabilit]
and buit'in demonstration. AdditionaF sets m
S50.00 each. The ROMY*e EPROM EMULATOF
works with simulator. Emulates EPROM:
2716-27256, Code-patching with line assemble)
Monitors address bus. Loads 32K of code in 2f
seconds (PC/AT12 MH;}. 90 day warranty Savei
you nxsney only S! 55,00 (complete with one set o
CPU simulator), J&M Software Hardware De
sign. Inc. 63 Seaman Road, West Orange. Ns
07052. Tel: (201) 325-1892, FAX: (201) 736-4567
INEXPENSIVE SINGLE BOARD COMPUTER!
— An 8051 based SBC f assembled} W!th RS-23;
circuitry; socketed EPROM; larpe breadboart
area; 128 byte memory and 14 T'O ports. Frei
programming software with each order. $38 .OC
(plus S2.75 Shi Suncoast TechnoEogies, PO Boj
5B35RE, Spring H>il. FL 34606,
COMPUTER CONTROLLED security 9y»ten
for home or business. Use$ IBM PC or C6^
computer. Includes infrared, various aensofi
and software. State of the Art security at t
reasonable coat. Send for free brochure
Welck Products, 8132 Rrestone #119, Downev
CA 90241.
LEARht MICRO-CONTROLLER programmini
using new 80C32 CPU, program in ^ic-S2 o
assembly language, the &0G32 CPU card has i
50 pin output header which witi interface with you
solderless tJreadboard, enabling you lo desion ifn
circuits that you want tad da, keypads, LCD, pp
output circuits, etc). Send self addressed busi
ness size envelop and $1.00 tor schematic, arw
full details to J. Macswan, 8132 Firestone Blvd.
Suite 67, Downey, CA 90241.
CABLE TV
TV NOTCH FILTERS, BROCHURE $1,00 MlCRC
THinc. BOX 63/6025. MARGATE, Ft
33063.(305) 752-9202.
TEST AIDS for testing units in FULL SERVtVI
mode. Starcom Vfl, $40 00: Starcom VI. S3 0. 00
Starcom DPBB, $50,00; Pioneer, $75.00; Tocon
ViP 5503,5507. $25.00; S A. call; Zenith, $25.00
N.E ENGINEERING (617) 770-3830.
TOCOM CABLE CONVERTERS Model 5504A
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Discounted to ONLY $24.95 each, CALL 1 (BOO
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to
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Connect Muscle Wires'" to n battery or oJher power
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Cretrte difeci [inear action wilhout heavy ge^irs,
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a!l-etettric ml'mn. j — T
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What Af0/Avsd& Wires?
^hisck Wires are higUy processed strands of
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800-374-5764
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Mondo-fronics
2d76 Verna Court - Fl
San Ijeandro, CA 94577
Qumtfoni; 510-351-5930
Fox; 510-331-6955
^ Inlertiolional Orders WElcomt! First Class P&K: S9.0
DESCRAMBLING, NEW secret manual Buitd
your own descram biers for cable and subscrip-
tion TV. JnstructFons, schematics for SSAV!, gatod
sync, Sinewave. (HBO. Cinemax, Showtime,
LIHF, Adult) $12.95, $2 00 postago.
CABLETRONICS, Box 30502R, BelhDSda, %AD
20824
"BULIEF' BUSTER, Protecl your cable box
against the irffanious cable "bullet." The "BulEef
Buster acts as an electronic shiefd. Installs in-line
in seconds. Don't wait until its loo fatef $19.95 plus
S3.0OS&H. ELECTROMAN, PO Box 24474, U&H
Ofl&ans. LA 7Qia4.
CABLE ENCODERS SA Dfopfield like new
S1 1 0Q.QQ , JerroEd D S E S 1 OOO . 00 , Jer ro Ed SSE 4CX]
converters, SA B510 $50.00. raw DRZ DlC
$65.00. Call Stan (414) S54-B616 Fone/Fax 3-8
GST Buying inventory.
CBTV CONVERTERS^ Jerrold 400 450 DlC:
S59.00. JSX JRX M35B $t9.00, SB-3 Sa5,00.
Oak RKDM, RTC-56 S69 00, Hamlin CR-60003M
$59.00, Starcom 6 Si 50.00. Olher brands in
stock. Minimum 10 Jots, For dealers only (405)
6BS-2048,
IT'S HERE at last — tbe new Zenith super chip!
This one works or you get your money back. It's
the all new Z2 chip. Easy to install, even idiots can
work with this one! Call lor prices on one, or a
quantity — youH be surprised how ineitpensive
the ZZ cao be. (305) 425-4376.
TDCOM 5503 "Turn on ' module. Watch all chan-
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$25.00 ea. Two for $39.00. Mike, Bo3< 743.
Oidsmar FL 34677,
MISCELLANEOUS
ELECTRONICS WANTED
SURPLUS PHOTOFACTS WANTED. Many n urn*
bers, atJ quantities. Loeb, 414 Chestnut Lane,
East Meadow. NY 11554. (516) 4flM330.
SATELLITE EQUIPMENT
VIDEOCIPHER lit descrambling manual, Sche^
matics, video, and audio. Explains DE5. Eprom,
C Eon e Master. 3Musketeef, Pay-per-view (HBO,
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postage. Schematics for Videocypher Plus,
S20.00. Schematics tor Videocypher 032, SiS.OO.
Collection of software to copy and alter Eprom
OXfes. $25,00. CABLETRONICS. Box 30502R.
Bethosda, MP 20824.
REPAIRS-SERVICES
CREATIVE ELECTRONIC technician looking for
R&D work that can be done at home. Arvalog or
digital circuits, 0,CousLns, 13 Tioga St., Newton
Fails, OH 44444.
LEARN TO fopair copiers E Order: Copier Doc-
tor, an introductory text on copier repair. Plus:
access to toner, deveEopor, parts. Si 2. 95 plus
$2.50 S&K Coastal Technical Products, 317
Leeds Gate Rd. , Savannah, GA 31406.
TEST EQUIPMENT
INTRODUCING: PROBE ANALYZER, 100 mil-
lion sample per second, 64 K deep, single node
logic analyjEer. in convenient hand held pnstje.
Uses PCs printer fJorl. multiple wavefonns dis-
played on screen for fas! troubleshooting. Cur-
sors, zoom, disk store, frequency measurement,
trigger, mofe, S20O.QO, ROCKY TEST 333
Slate Street. Suite 214. Lake Oswego, OR 97(J34.
Phone inromiation (503) 636-3840.
TOPMARK'S DEVICES: Frequency syn-
thesizers, 0.5-3GHZ. octave bands, 10-200KHZ
steps, 4MS lockup time, SSOO.OO + ► Source tock*
ing versions, $400.00 + . VCOs. amplifiers*
S10O.00 . Topmark (312) 262-3162.
DISTORTION ANALYZER in Radio- Electronics
12-91 art icie measures 0.005% THD. 90db notch
at 1kHz. BuiEt-in calibrator Uses your DVM for
measuriament. Only nine ICs. Silkscreened front
panel and finished prinied circuit board: $28.00.
fNSTRUMEX, Box 490. Blue Bell, PA 19422.
VCO'S a Synthesizers: 1-2GHZ and 2-3GH
VCOs and synthesizers, lOdbm output, excel I er
phase noise. VCO's $250.00. synthesizer
S550.00. Higher frequency versions available l
20000MHZ, Orders only Topmark (312) 262-31 6J
BUSINESS OPPORTUNITIES
EASY WORKl Excellent pay! Assemble produd
aihome. Call toll free 1 (500) 467-5566 ext. 11068
EARN GREAT SSS WITH YOUR COMPUTEF
Work at home! PROVEN SUCCESS! Send $1.0
for details to: Owen. 5900 Yorkwood Rd.. Balto
MD 2123t.
A GREAT idea is a terrible Ihing to waste 1 Receiv
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about Sharefare. SI. 00, SASE, Nicknap, Suit
287, CN 1907, Wali, NJ 07719.
EDUCATION
GET YOUR "FCC Commercial General Rad
otelephone License." Electronics home stud
FasL inexpensive I Free details. Command Pre
ductions, D-225, Box 2824, San Francisco, C,
941£6'2824.
TELEPHONE HOME study course. Profession
certilication. Association of Cerllfied Telephon
Technicians, Route 3. Box 98, Eltinaton, M<
63£3e.
SHARf^EN YOUR electronic skills with the Basi
Electronic Simulations and ProbFems computi
program for the PC-MSDQS. Perfect to help yo
prepare for your GET test. Satisfaction guarar
teed. 329.95 plus $3.00 S&H, EES*RE8E01, PO
1391. Lubbock. TX 79408.
PUBLICATIONS
HIGH VACUUM [echnrque, physical electronic;
and related topics for the serious amateur exper
menter. Subsaibe to the Betl Jar. a new quarterl
jouma!. SASE for furtner information or $15.00 pc
year (US addn^sses) payable to Steve Hansen. 3
Windsor Drive, Amherst. NH 03031.
COMPONENTS
BATTERIES GALORE for all electronic proj
eels and household needs. Free catalog. PO Bo
9932, Maplowood, MN 55109. Or phone 1 (600
657-5929.
ELECTRONIC SURPLUS catalog. Send SASE b
Electrical and Metal Recovery^ 4578 Cote Rd.
Syracuse, NY 13215.
STAINLESS STEEL screws, nuts, washers. As
sorted kits. Free catalog. Rusty Bdt, Box 70SS
North Attleboro, MA 02761,
SOLOERLESS BREADBOARDS 840 tie point
with versatile magnet-c mounting system $6.5^
add $2.00 S&H. Magnetic mounted digital mod
ules in wired and kit form from $4.00. Send Si .01
for fist. Omegatronics. PO Box 911, Bloom ingdaJe
fL 60108.
COMPUTER SOFTWARE
COMMODORE 64 Ham programs, 8 disk sides
over 200 amateur programs S16.95, 29 cen
stamp gets unusual software catalog of uEilttias
games, and British disks. Home-Spun SoftwaFie
Box 1064-B. Estero, FL 33928.
VIRUSFREE SHAREWARE; 29 MEGABYTES
$29.00, add $29.00/29MB increment Up to 58C
MEGABYTES. Include $3.00 shipping pe
100MB: 1 (800) 876-8496. Visa-MC. SHARE
NET, POB 12368, OkEahoma City, OK 73157,
SO'MEGABYTES programming SRC utililies C
ASM.' PAS. Basic $50,00, S3.00 shipping: 24hi
orderyinfo/fax: 1 (800) 676-8496. Visa-MC
SHARE-NET POS 12368. Oklahoma Gty, OH
73157.
SHAREWARE! THOUSANDS OF IBM PRO-
GRAMS. S3.00 S^H for 2 disks full plus cataloc
disk. American Software, PO Box 509. Suite W.
Roseville, Ml 48066-OS09.
60A78
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ORDER TOLL FSEE: 800/343-1465 »ES
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TOUCH-TONE DECODER/DISPLAY AND ASCII CONVERSION BOARD
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ModH TDD^ daeadaa ajrbd dispkys all 16 DTMF dl^U iind provides an. ASCII eeriel ouiput.
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TEL: 800*338-9058 503-687-21 IB
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FAX: 503-687-2492
fT«uc>i Twt» LI ■ IjaiJemMfk AT&T)
60A79
ANTIQUE ELECTRONICS
TUBES, PARTS (oW stock from cki%&3 or ban
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AUDIO-VtDEO-LASERS
IBM PC and laptops video digiJizer. conrwjcts
cameracorcfer, 640 by 480 resofution, 256 gr
levets S89,9Q Demo dJsk S3. 00, informant
Colorbursl Box 3091. Nashua, NH 030*
Phona (603) a9M5aa.
IBM COMPUTER PROGRAMS $1 99! Wiodon^s.
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IBM SOFTWARE for hams. lech n Ida ns, and stii-
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CROSS PART DATABASE SOFTWARE:
Crosses common oleclronic component part
numbers to SYLVAN1A and PHILIPS replace^
menis. Contains approximntcfly 31.000 pari num-
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SOFTWARE: Crosses prefixes oleredroniccom-
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DATABASE - $36,00 IDENTIFY ^ S10.00 MC,
Visa, check, money orders accepted. CPS SOFT-
WARE, PO Box 28. Biackwetl. OK 7463L (405)
363-4330.
PC BOARD arxj scJ^aik: design software for
the IBM PDKOTpaiible. Cie^prolesskjnal PCB
layouts (with amtiting — lequiras EGA) arid
electronics schematics (CGA) wgh these inex*
pensive ^reware programs. Both for S7.00.
SUNCOAST TECHNOLISGIES. P06oxS635R£.
Spor^g FL 34606
PROGRAM THE 8051 microcontroner in Base
with this PC compatible shareware coflection.
Disk contains Edrtor, Basic Compiler. Assembler,
Disassembler. Procomm plus 3 surpnse pro-
grams. Dnfy S7.00 ?rom SUNCOAST TECH*
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6051 TINY Basic iniorpreier A program thiat te-
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Cable Tes^
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The Time
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shot — a single pulse is emitted),
and astable (a stream of output
pulses is generated). In the
monostable mode when func-
tioning as timers, time is pre-
cisely controlled by the external
RC network. In that mode the
555 produces output pulses
with rise and fall times mea-
sured in microseconds.
In the astable mode, the 555
can be an oscillator. It can main-
tain an accurately controlled
free-running frequency and
duty cycle with only two exter-
nal resistors and one capacitor
In either monostable or astable
modes, timing accuracy is es-
sentially independent of varia-
tions in supply voltage or
ambient temperature. The de-
vice can be triggered and reset
on falling waveforms.
T^T>ical applications for the
555 include precision and se-
quential timing, pulse genera-
tion, pulse-width and pulse-
position modulation, and linear
ramp generation. Moreover it
can directly drive loads such as
relays, solenoids, low-power
lamps, and high-impedance
speakers.
The 555 is packaged in plas-
tic and metal DlPs and 8-pin
metal cans for operation in the
commercial temperature range
of 0 ''C to -I- yO^'C. Some plastic
DIPS can operate in the ^O'^C to
+ 85'^C extended temperature
range.
Alternate-sou reed 555's can
usually be identified by the in-
clusion of the numbers 55 or
555 in their designations. Ex-
amples include Harris* CA555.
Motorola^ MCI455. and Nation-
al Semiconductors* LM555C.
Other sources include Exar.
Goldstar Raytheon. Samsung.
SGS-Thomson, and Sharp Elec-
tronics. CMOS versions of the
555. suchasTfexas Instruments'
TLC555 are also available. In
addition to their low power con-
sumption compared to stan-
dard 555's, their outputs are
compatible with CMOS as well
as TTL.
T^ble I presents some basic
electrical characteristics for the
555. The 556 is housed in a 14-
pin DIP package but the block
diagram of each circuit is iden-
tical to that of the 555 shown in
Fig. 1 . The 556 is also alternate-
sou reed by many of the same
firms that offer the 555. Exam-
ples are Motorola's MC3556 and
Texas Instruments' TLC7556,
How the 555 works.
Figure 2 is a representative
circuit schematic for the 555, It
contains 21 transistors, 4 di-
odes, and 15 resistors. The volt-
age divider consisting of three
5000-ohm resistors (shown In
Fig. I) appears to the right of
QIC in the trigger comparator. It
applies one-third of the supply
voltage to the non- inverting in-
put terminal of the trigger com-
parator and two-thirds of the
supply voltage to the inverting
input of the IC's threshold com-
parator.
The output of the two com-
parators controls the R-S flip-
flop, which in turn controls the
states of the complementary
output stage and the slave tran-
sistor Q6. The flip-flops state
can also be set by signals at
RESETF pin 4.
When organized as a mono-
stable timen the tf^igger pin 2
is held high by external resistor
Rp in series with the DC supply
voltage. Under that condition,
Q6 is saturated, shorting exter-
nal timing capacitor Cp to
ground, and output pin 3 is
driv^en low. Timer action is
started by applying a negative-
going trigger pulse to pin 2, As
this pulse falls below one- third
of the DC supply voltage, the
output of the trigger com-
parator changes state. That
causes the R-S flip-flop to
switch, turning Q6 off, and
driving output pin 3 high.
As Q6 turns off, the short is
removed from the external ca-
pacitor Cp. The capacitor
charges through the external
resistor Rp until the voltage
across C^^ rises to two-thirds of
the supply voltage. Then the
threshold comparator changes
state and switches the R-S flip-
flop back to its original state,
turning Q6 *'on '* and rapidly dis-
charging Cp, At the same time,
OUTPUT pin 3 reverts to its low
state. The timing cyde Is then
complete.
A characteristic of the 555 is
that, once triggered, it cannot
respond to additional triggering g>
until the timing sequence is ^
complete. However, the se- 3
quence can be aborted at any ^
time by feeding a negative-going g
pulse to RESET pin 4. ^
The output pulse is a square ^
wave whose duration (lime de- |
lay) depends on the values of R 1
and C. The formula for this is: 5
tp (time delayl = LI (value of R z
X value of C) *
Simply stated, time delay is
directly proportional to the S3
TABLE 1— ELECTRICAL CHARACTERiSTlCS
Chamcteristlcs
Symbol
Min.
Max.
Unit
DC Supply Voltage
Vcc
4.5
16
V
DC Supply Current (V-h =5V)
3
6
mA
(V+=5V)
10
15
mA
Power Dissipation
600
mW
Thresfioid Voltage
V
Trigger Voltage (V-H =^5V}
V,
1,67
V
(V-f=15V)
5
V
Reset Voltage
0.4
0.7
1,0
V
Reset Current
0.1
mA
Timing Error (Monostable)
1
%
Fre<|uency Drift with
Temperatuie
50
ppfnTC
Drift with Supply Voltage
0,1
Output Rise Time
K
100
ns
Output Fail Time
U
100
ns
TRIGGER
COMPARATOR
f
aiP-FLOP
OUTPUT
, COMTROL
^ VOiTtfCE
Q10
2 V
TRIGGER
RESET
l'-^- , RESET ^
DISCHARGE 08 |
< ^ f J ■ 1 I —
Cd?^ X Q^j^j —
^,|^' 2^ J^DISCHARGE
ii i ^^
016 J
7K
4JK
015
03
018
019j
3.9K
-M 1
04
220 I
TOUTPUT
0T7
□21
4JK
^ 22K
IC1
55S
I *y lOOijF
S2 NO
RESET
+ 12V
01
tN40in
— W—
OUTPUT
u
SI NO
START i
1N40D1
RV1
12V
7~ TIMER WITH A RELAY OUTPLn" provides time deJays of 1.1 to 120 seconds.
premature terminaUon of I he
timing pjcriod.
The 555 timer can drive non-
inductive loads directly from
pin 3 with currents as large as
200 milllamperes. However, if
the circuit contains an indue*
live relay load, either of the
schematics shown In Fig. 6 ap-
ply In Fig, 6-a, the relay RYl is
normally off. but it goes on only
when OUTPUT pin 3 goes high
during the timing Interval: in
Fig, RYl is normally on, but
It turns off during the timing
IntervaL Diode Dl in both cir-
cuits protects the 555 against
inductive- switching damage.
The contacts of relay RYl can
control external circuits.
Figure 7 shows how a relay
and a 555 can form a simple 1 . 1-
to 120-second timer in two
switch-selected decades. How-
ever, the general-purpose cir-
cuit has several drawbacks.
Firsts tt draws current continu*
Dusly even when the timer is
off. Second, because of the wide
tolerance variations in the elec-
tro lytic timing capacitors CI
and C2, potentiometer R4
needs two custom calibrated
scales.
The schematic in Fig. 8 shoe's
how to overcome these draw-
backs. The RESET switch S2 and
the set of relay contacts in paral-
lel with the START switch SI.
which are both normally open
(N.OJ keep the circuit off so
there is no current drain. The
timing cycle is started by press-
ing momentary pushbutton
switch 81* which connects
power to the 555. At the instant
of SI closure. C3 is fully dis-
charged. It therefore sends a
start pulse to trigger pin 2
through R4 and initiates a tim-
ing cycle.
As the timing cycle starts. RYl
is energized. The contacts in
parallel with SI close and keep
the 555 powered even when S2
is released. At the end of the
timing cycle RYl is de-energized
and Its contacts re-open, dis-
connecting power from the 555.
The timing of the circuit in
Fig. 8 Is principally controlled
by the vaiues of resistor Rl and
potentiometer R5. and either CI
or C2. which are switch-se-
lected bv S3-a. Note, however.
SI m
START
■ ^ i — ^ ^
RY1
12V
>60O
RQ. 8— PRECISiON (COMPENSATED) TIMER with a relay output has two ranges: OJ
to 10 seconds and 9 to 100 seconds.
AUTO
BATTERY
S2
(IGNITION
SWITCH) '
O t OOFF
START %^
SI
(HEADLIGHTS
SWITCH)
R1
470K
CI _
= {CHASSIS)
RG. 9— HEADUGHT TURNOFF CONTROL with automatic delay for automobiles.
HEADLIGHTS ^ ^
OR SPOTLIGHT OFF
S V^tTCH ^
Rl
470K
7 12V
t AUTO
I BATTERY
Ct
IC1
555
R2
22K
2
;c?
I
L _ _
D2
tN4ll01
— w—
I
, S1 NO
' START
ON
5k
0,0 VF
R3
10K
M
D1
1K40n
HEADLIGHTS ^
SPOTLIGHT W
RYl
; 12V
>6oa
(CHASSIS)
RG, 10— HEADLJGHT/SPOTLIGHT TURNOFF CONTROL for automobifes Is manually
actuated.
that timing is also influenced by
the setting of potentiometers
R6 and R7. They are selected
ivith switch S3-b and connected
to CONTROL voUage pin 5 of the
IC, Those potentiometers effec-
tively shunt the internal voltage
of the 555, thereby altering tim-
ing periods.
That feature allows the circuit
to produce precise timing peri-
ods even when capacitors with
loose-tolerance values are in the
circuit, it also allows a single
calibrated timing scale to cover
the two switch-selected timing
ranges,
lb set up the Fig. 8 circuit,
first set potentiometer R5 to its
maximum value, set switch S3
to position 1 and push start
button SI. Then adjust potenti-
ometer R6 for a precise period of
10 seconds. Next, set 3 to posi-
tion 2, push START switch SI.
and adjust potentiometer R7 for
a precise period of 100 seconds.
With those adjustments com-
plete, the timing scale can be
calibrated over its full 100-sec-
ond range.
Timers for car lights
Figure 9 is a circuit that auLo-
matically delays the turn-off of
an automobiles headlights^ per-
mitting them to function as
safety lights at night after the
ignition switch is turned off. It
Is a useful circuit if you want
your car's headlights to remain
on for 50 seconds after you have
parked* turned off the ignition,
locked the doors, and walked
away The headlights will stay
on long enough to illuminate
your route until you can reach
the safety of your home. The cir-
cuit does not interfere with nor-
mal headlight operation.
When the cars ignition
switch S2 is tLirned "on," RYl is
energized (through diode D3]
closing its contacts and con-
necting the 12-volt battery to
the 555 and headlights switch
SI, In this state the headlights
operate normally Howeven be-
cause both sides of capacitor C2
are connected to the positive
supply, it is fully discharged.
When S2 is turned "off," the
voltage across R3 goes to zero,
de-energizing the relay. How-
ever, at that time C3 applies a
negative-going trigger pulse to
TRIGGER pin 2, initiating a 50-
second timing cycle that applies
current to the relay coil through
Relay RYls contacts remain
closed for about 50 seconds
after S2 is turned off. keeping
the positive battery supply con-
nected to SI during this period.
That keeps the headlights on if
SI is in its on position. At the
end of that 50-second time de-
lay, RYl de-energlzes, its eon-
(D
R4
S1 NO
START
R5
47K
(SET
Aim
CI .
R2
100K
IC1
55S
G3
— )l-
R3
33DK
-^MA —
D2
+ 12V
OUTPUT
TO PORCH
LIGHTS
RY1
12V
>60O
RG, 11--F0RCH LIGHT CONTROL AUTOMATICALLY turns on a light for a preset
period only when triggered at night.
R3
2M
mPUT<^
CI
o V ^
R1
10K
R2
10K
R4 ^
zzk:
C2
0.001 pF
01
2K3704
m
100K
€3
(SEE ;
R5
8.2K
ICl
S55
^ —
^+5T0+15V
R7
3
^ (LEVEL!
04
O.OIjtF
^^OUTPtlT
FIG. 12— ADD-ON PULSE GENERATOR can supplement a stand-alone pulse gener-
ator. Jt is triggered by rectangular input signals. Table 1 gives output pulsa widths for
various values of C3.
+5TO-H5V
RG. 13— MODIFIED ADD-ON PULSE GENERATOR can be triggered by any kind of
input waveform Including sine waves.
tacts open, and battery supply
IS disconnected from the 555
and SI.
The circuit in Pig. 9 is com-
patible with modem practice for
powering the headlights switch
SI with Ignition switch S2 so
that headlights work only when
the ignition switch is on. How-
even the circuit shown in Fig. 10
is applicable to older vehicles
whose headlights or spotlight
are independent of the ignition
switch. The circuit illustrates a
manual delayed turn-off light
control.
That circuit works if the vehi-
cle is parked with Its lights off*
They uill be turned on for a pre-
set 50-second period as soon as
momentary pushbutton start
switch 81 is pressed. When the
delay period times out. the
lights will be turned off again
automatically.
The Fig. 10 circuit Includes
relay RYl with two sets of nor-
mally-open contacts. The tim-
ing sequence Is started with the
momentary closure of pushbut-
ton switch SI. Normally, both SL
and the relay contacts are open,
so the timer circuit Is not
powered and the lights are ofT.
Capacitor C3 is discharged un-
der this condition.
When SI is momentarily
closed, RYVs coll is energized.
That action closes its first set of
contacts, applying power to the
cars lights while aJso closing its
second set of contacts, applying
power to the 555, However,
TRIGGER pin 2 of the IC Is briefly
grounded through C2, so a
negative trigger pulse is fed to
it, and a timing cycle is begun.
Consequently output pin 3 of
the 555 switches high when the
relay contacts close, locking the
relay into its "on" state (re-
gardless of the subsequent state
of SI), keeping the lights on for
50 seconds. At the end of the
timing cycle, pin 3 of the 10
switches to its low state, de-en-
ergizing RYL Then both sets of
relay contacts open, discon-
necting power from the 555 and
the lights.
Automatic porch light
Figure 11 is an automatic con-
trol circuit for a porch light. It
wiD turn a porch light on auto-
matically for a preset 50-second
period when Its sensor detects
the presence of a person. How-
ever, it performs that function
only at night or under condi-
tions of reduced visibility such
as might occur during a storm.
The circuit is activated with
switch SI, which can be a
microswitch triggered by a por-
ch gate. It might also be a pres-
sure-switch hidden under a
porch mat and triggered by a
person weighing perhaps 50
pounds or more.
Circuit operation depends on
a negative-going pulse that falls
below the internally controlled
R1
m
m .
iok:
INPUT
B4
ICI
555
21 D1
C4
0.001
C3
R5
tOOK)
P7
2^
\C2
SS5
^C5
4.7K'
" C6
0.001 mF
m
$.2K
119
tOOK
+5TO+15V
IC3
555
OLTTPUT
1
RIO
1.0K
(LEVEL)
^ C8
FIG. 14— ADD*ON DELAYED PULSE GENERATOR can be triggered by any input wave*
form {a% Wavefarms at input to ICI and thase at the outputs of IC2 and EC3 based on
different values of R and C (t%
one-third supply voltage being
fed to TRIGG EvK pin 2 of the 555,
If the trigger pulse does not Tall
below that value, the timing cy-
cles cannot be initiated.
In Fig. IL the photocell (re-
sistor R4) and potentiometer R5
are in series as a light-depen-
dent voltage divider One side of
Si is connected to the junction
between R4 and R5, and the
other side is connected to pin 2
through a the network of C2
and R3. In normal daylight the
photoceirs resistance is low, so a
high voltage appears at the
junction of R4 and R5. As a re-
sult, closing SI sends a voltage
pulse to pin 2 whose value is too
low to pull pin 2 below one- third
of the supply voltage. Thus, the
timer cannot be triggered with
SI under those conditions.
However, the photocell s resis-
tance value increases at night or
under reduced visibility caus-
ing a low voltage to appear at the
R4-R5 junction. Under that
condition, closing Si generates
a voltage pulse that pulls pin 2
below the one-third supply volt-
age value, triggering the timer
The cadmium-sulphide (CdSl
photocell (resistor R4) should
have a resistance of 1000 to
47.000 ohms under "dark"
tum-on conditions. Potentiom-
eter R5 can be adjusted to preset
the minimum '*dark" level for
circuit triggering. The trigger
signal is fed to pin 2 of the 555
through the C3 and R3, a net-
work that shapes the trigger
pulse and effectively Isolates the
DC component of the photocell-
potentiometer network from
pin 2,
Pulse generators
In all of the circuits presented
so fan the 555 functions as a
monostable (one-shot) pulse
generator. Suitable trigger sig-
nals are fed to trigger pin 2 and
output pulses are taken from
OUTPUT pin 3, The 555 can gen-
erate well formed output pulses
with periods from 5 microse-
conds to hundreds of seconds.
The maximum usable pulse re-
pi tition frequency is approxi-
mately 100 kHz.
The signal reaching triggkk
pin 2 must be a carefully shaped
negative-going pulse. Its ampli-
tude must switch from an "off
value greater than two- thirds of
the supply voltage to an 'on" val-
ue less than one-third of the
supply voltage, (Triggering ac-
tually occurs as pin 2 drops
through the one-third supply
voltage value,) Tt^igger pulse
width must be greater than 100
nanoseconds bul less than that
of the desired output pulse.
That condition assures trigger
pulse removal by the time the
monostable period times out.
Suitable trigger signals for
the 555 in the monostable mode
can be formed by converting the
Input signal to a good square
wave that switches between the
full positive supply voltage and
ground- The square wave is
then coupled to pin 2 with a re-
sistor-capacitor diHerentiating
network having a short time
constant* That network con-
TABLE 2— CAPACfTOR VALUES
FOR PULSE-WIDTHS
Capacitors C3 Pulse Widtti Range
(Microfarads) {Time in Seconds)
10-0 90 ms -1.2
1.0 9ms -120 ms
0.1 900 iiS - 12 ms
0.01 90 - 1 .2 ms
0.001 Bps - 120 (iS
verts the leading or trailing
edges of the square wave into
suitable trigger pulses.
Figure 12 shows a liming cir-
cuit that accepts Input signals
already in the form of square
waves or pulses. TVansistor Ql
converts a rectangular input
signal into a form that switches
between the positive supply and
ground. The output signal is
S2>1
SfF
R1
Z2K
SI
m
R2-
B3
22K
IC1
555
C3
0.00 l^F
ft4'
RS
10K
IC2
5S5
R5
R7*
+ ST0+15V
IC3
555
OUTPUT 1 OUTPUT 2
(SEE mm fSEE TDCn
^SELECTED VALUES OF H mO C
3 OUTPUTS
fSEETlXn
SIART
OUTPUT 1
OUTPUT 2
OUTPUTS
RG. 15— 'mREE-STAGE SEQUENTIAL TIMER or pulse generator (a) and waveforms at
three different output pins (H
then fed to trigger pin 2
through differentiating net-
work C2-R4. The clrcuK can be-
come an add-on pulse generator
In combination with a separate
square-wave or pulse generator
Variable-amplitude output
pulses can be obtained from po-
tentiometer R7,
The output pulse widths of
the Fig. 12 circuit can be varied
over more than a decade range
with potentiometer R6, and
they can be switched in overlap-
ping decade ranges with the \^al*
ues of C3 listed in Table 2. With
the component values shown*
output pulse width is variable
from 9 microseconds to 1.2 sec-
onds. Capacitor C4 decouples
CONTKOl. VOLTAGK pin 5 to im-
prove circuit stability.
Figure 13 shows a modifica-
tion of the circuit in Fig. 12 that
can be triggered by any kind of
Input waveforni, including sine
waves. Here the first 555 (ICl) is
configured as a Schmitt trigger
to convert all input signals Into
square-wave output signals.
Those square waves trigger tlie
second 555 (IC2) in the mono-
stable mode in the same way as
described earlier. The circuit
can also become an add-on
pulse generator in combination
with any kind of stand-alone
waveform generator that pro-
duces output signals with peak-
tO'peak amplitudes greater
than one-half the ICs supply
voltage.
Figure 14 -a shows how two
monos table circuits can be con-
nected in scries to make a de-
layed-pulse generator. As in Fig.
13, the first '555 {ICD \s config-
ured as a Schmitt trigger The
second 555 (IC2) controls time
delay width* while the third 555
MC3) determines the output
pulse width.
As shown in Fig. 14-5, the
output pulse at pin 3 of ICS ap-
pears at a time interval after the
initial application of the trigger
signal. This time delay width
Tj^i is determined by the prod-
uct of the value of capacitor C3
and the sum of the values of re-
sistor R5 and poten t lometcr R6.
in accordance with the time de-
lay formula given earlier Sim-
ilarly output pulse width i^^ *s
determined with the values of
C7, and R8and R9.
This circuit can become part
of a stand-alone pulse delay gen-
erator by building it into a
square-wave generator case.
The square-w^ave generator will
provide the initial trigger sig-
nals needed.
A number of monostable
pulse generators can be placed
In series to operate in sequen-
tial form. Figure 15-a. for exam-
ple, shows a three-stage se-
quential generator circuit. It
can control lamps or relays in a
pre-programmed time sequence
after pushbutton switch SI is
pressed to give the start
command. Note that the reset
pins (pin 4) of all three 555 s are
shorted together and positively
biased by R6. Those pins can be
shorted to ground with set
switch S2. \Wien power is ap-
plied, SI should be closed, en-
suring that none of the 555 s in
the circuit are falsely triggered.
Figure l4-i> shows the wave-
forms from the output pins of
all three 555's (ICl to IC3). The
time delay t^^ Is determined by
the values of CI and R2* tp^ is
determined by the value of C4
and R4 and t^^ is determined by
the values of C7 and R7 when
Inserted in the time delay for-
mula given earlier.
Finally, three or more mono-
stable circuits can be connected
with capacitor C9 (shown in a
dashed connection line) be-
tween SI and pin 3 of the third
555 (IC3). This loop feeds a sig-
nal back from the ouiTU^r pin of
IC3 to tile input trigcikh pin of
ICl, permitting infinite repeti-
tion of pulse sequence. The cir-
cuit can drive LEDs and digital
logic. Tile circuit also has the
reset capabfiity provided by S2
that clears the circuit when
power Is first applied. r-e
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Set up a versatile sfoping-vee antenna for
your shortwave receiver of tiam rig
to improve your transmission
and reception at low
cost.
THE SLOPINGA'EE A^VTEt^JNA IS ONE
of the most versatile broadband
antenna designs available to
amateur radio enthusiasts and
shortwave listeners. It is struc-
turally simple, inexpensive,
easy-to-buUd, and easy to set up
In the field if you want to take
your rig with you on vacation.
The sloping vee can achiew
moderate and occasionally even
high gain over a frequency span
of 5 to 1, 10 to L or mor^. The
antenna is functional over the
high-frequency (HP) into ultra-
high- frequency (UHFJ-range
from about 3 MHz to about 800
MHz.
The most common configura-
tion for the sloping- vee antenna
is shown in Fig. Lit consisls of
two sloping, radiating elements
(wires) fed by a radio-frequency
source at their vertex. The
source is located at a height H
above the ground, and the ele-
ments are terminated by two
equal resistors, R, located at or
near the Earths surface. Tech-
nically it is an /nver fed- vee slop-
ing antenna.
The true sloping-vee antenna
has a vertex height, H, that is
actually less than the height of
its terminations. The radiating
elements slope up from the
ground, not down as shown in
Fig. 1, making this configura-
tion more difficult and expen-
sive to build because two masts
are required. However, both
forms are called sloping vee s be-
cause they resemble a tilted let-
ter "V."
This article presents a sys-
tematic design procedure that
takes into account the unique
characteristics of this antenna.
A tjrpical design for an HFA^F
ID- to 60-MHz sloping- vee an-
tenna is discussed in detail, and
measured performance data for
the actual antenna is given. A
frequently overlooked feature of
the sloping- vee antenna at HF
and a major advantage is that it
combines the features of hori-
zontal and vertical antennas,
which results in virtual polar-
ization diversity.
In a careful design* the
characteristics of the communi-
RICHARD A, FORMATO
cation links to be supported by
the antenna must be consid-
ered. For example* the take-off
angles at which the antenna
must have adequate gain are de-
termined by the transmitter-to-
receiver distance and by the vir-
tual ionospheric reflection
height.
Another design constraint is
the antennas required band-
width which Is determined by
the operating frequencies. For
some amateur radio operators,
only the HF band {3 to 30 MHz)
is of concern; others want to
cover the upper HF range and
the 6-meter (50 kHz) band as
well- High-gain antennas such
as Yagis exhibit a bandwidth of
a few percent of the center fre-
quency. A well designed sloping
vee, by contrast, wlil cover the
entire HF spectrum and even ex-
ceed it.
Antenna siting is another im-
portant consideration in the de-
sign of a sloping vee. From HF o>
well into the VHF range, the %
Earths electrical charac- 1
terlslics (ground conductivity ^
and dielectric constant) have a ^
dramatic effect on antenna per- ^
forma nee. Ground effects are m
especially important at low S
take-off angles (close to the |
horizon). 3
Shallow take-off angles are z
necessary for long-range trans- i
mission. For very long dis-
tances, the take-off angle could 71
be so low lhat mountains or
other terrain features block sig-
nal transmission. Those
obstructions limit the mini-
mum take-off angle which, in
turn, limits the range.
Sloping-vee operation
As shown in Fig, 1, the RF
source excites current waves on
the vees radiating elements-
The total current consists of
two components: an incident
wave propagating from the
source toward the end of the ele-
ment, and a reflected wave prop-
agating from the terminating
resistor back toward the source.
In an ideal vee, the reflected
component is zero because the
terminating resistor absorbs
any incident energy that would
otherwise be reflected. In prac-
tice, there is a only a slight re*
fleeted component. The inci-
dent and reflected waves com-
bine poinL'by-point along the
element length to form a weak
standing- wave pattern. An un-
terminated antenna^ such as a
center* fed, half- wave dlpole,
propagates a reflected wave with
a large amplitude that creates a
strong standing-wave pattern.
The half- wave dipole is a reso-
nant, narrow band, standing-
wave antenna. By contrast, a
properly designed vee is a non-
resonant, broadband, travel-
ing-wave antenna. Broadband
operation Is obtained from the
vee antenna by eliminating as
much of the reflected current
wave as possible. The terminat-
ing resistors are capable of ab-
sorbing most of the incident
energy that is not radiated from
the elements. If the terminating
resistor is conjugate-matched
to the characteristic impedance
of the radiating element, there
is no reflected signal because all
of the power is absorbed*
This situation is the same as
the maximum power transfer
condition for a transmission
line feeding a load. The load ab-
sorbs maximum power when its
internal impedance is equal to
the complex conjugate of the
transmission line's charac-
teristic impedance Zq. Because
for well-designed transmis-
sion lines is nearly a pure resis-
tance, the matched load is a
resistance of equal value* The
most common coaxial cable im-
pedance is 50 ohms, and the
corresponding matched load is
a resistive 50 ohms. The load
could be a 50-ohm dummy (es-
sentially a resistor), or it could
be an antenna with an input im-
pedance of 50 + JO ohms*
The frequencies at which the
vee exhibits near traveling- wave
behavior determine its useful
bandwidth. The precise defini-
tion of impedance bandwidth is
the range of frequencies at
which antenna input voltage
standing- wave ratio (VSWR) is
less than or equal to some
threshold value, typically 2 to
2.5 : 1 for transmitters and up to
5:1 for receivers. There are dif-
ferent thresholds because
transmitter circuits cannot tol-
erate high VSWR without re-
ducing output power or shut-
ting down: by contrast, a
receiver is not limited by VSWR,
For receive-only operation, in*
creased antenna VSWR causes
higher mismatch loss into the
receiver front-end, which re-
duces the available signal leveL |
There is a point at which the!
mismatch loss is so high that
receiver sensitivity (minimum
detectable signal) becomes un*
acceptable low Figure 2 is a plot
of mismatch loss as a function
of VSWR with one end of the
transmission line matched . At
a VSWR of 5:1. receiver sen-
sitivity is reduced by only 2.5
dB: but at 21:1, the' reduction
approaches 8 dB.
An objective for the design of
a vee antenna is to maximize
the range of frequencies in
which VSVm is less than 2,5:1
for transmission and less than
5:1 for reception. An antenna
meeting the transmission crite-
rion between 3,5 and 30 MHXt
for example, could be loaded di-
rectly on aU bands from 80 to 10
meters without a tuner or
matching network! The same
antenna could receive over an
even wider bandwidth.
Design procedure
The design of a good vee In-
volves three steps. The first is to
evaluate the kinds of communi-
cation links for which tlie an-
tenna is intended. The designer
must answer the following
questions: What are the dis-
tances and operating frequen-
cies involved, and what is the
propagation mode? The second
step calls for the selection of the
vees apex angle based upon the
intended operating frequency
and antenna size. The third
FIG. Z-^PLOT OF MISMATCH LOSS in decibels vs. VS WR wtth one end of the transmis-
sion-line nratched.
Step Is the computation of the
antenna radiation patterns for
the desired distances.
The assumed specifications
for the design of a vee antenna
arc:
• Frequency range — 15 to 50
MHz (continuous)
• Propagation mode — meteor
trails at 100 kilometers
• Link distances — 400 to 1200
kilometers (250 to 750 miles
• Antenna si ting — limited to an
area 100 x 100 feel and a height
25 feel
• Main lobe gain — 0 dBl, mini-
mum value
Step 1 — Link evaluation
Three transmission -path fac-
tors Influence vee design: dis-
tance between transmitter and
receiver {determines antenna
take-off angles); operating fre-
quencies (determines required
bandwidth): and propagation
mode (determines take-off an-
gles). Each of those factors must
be known or estimated to de*
sign an antenna matched to the
path.
Signals propagating between
points on the Earlh^s surface
are bent by the ionosphere or
other scattering mechanism
such as a meteor reflection. The
most common (but not the only)
propagation mode at HF is tlie
skywave. The transmitted sig-
nal Is bent back toward the Ear-
th's surface by the Ionospheres
changing refractive index. This
process is equivalent to a spec-
ular reflect ion from a virtual re-
flection point. The simplest
model ol HF slqrwave propaga-
tion is a straight-line signal ray
from the transmitter to a loca-
tion near the refiectlon point
where it Is bent back as another
straight line ray from the reflec-
tion point to the receiver as
shown in Fig. 3.
The attainable distance in a
communication path depends,
in part, on the reflection height,
with higher reflections provid-
ing greater distances, HF sky-
wave propagation is caused by
reflections from the iono-
spheres layers: D layer (about
50 kilometers high), E layer
(about 120 kilometer high) and
F layer (200 to 500 klloineters
high). Meteor-trail rellcctlons
are of growing interest because
of the increased availability of
high-speed packet data equip-
ment. Those reflections occur at
altitudes of about 100 kilo-
meters.
The path geometry (reflection
height and transmit ler-to-re-
VIRTUAl REFLECTtOI^
POINT
METEtmREniCnON
IONOSPHERE
F-LAYER100T0 260MI
E-LffirEnaOT0 7o mi
RG. 3— DIAGRAM SHOWING RELATIONS between laki.
point, and signal range.
idual reflection
velver distance) determines the
range of required take-off an-
gles for the antenna. Signal rays
transmitted at too high an angle
fall short of the receiver, while
those transmitted at too shal-
low an angle can overshoot the
receirer.
Figure 3 shows two important
angles in vee design. The take-
off {or elevation) angle is mea-
sured upward from the earth's
surface to the ray direction. The
polar (or zenith) angle is mea-
sured down from the vertical to
the ray direction. Both angles
are important because path re-
quirements are usually de-
scribed in terms of the take-off
angle, but antenna perfor-
mance is usually referred to a
coordinate system bas^d on the
polar angle. The sum of the pol-
ar angle and the take-off angle is
90"", so the polar angle can al-
ways be determined by sub-
tracting the take-off angle from
90^ and the take off-angle can be
found by subtracting the polar
angle from 90^
Figure 4 is a communication-
range plot. The left vertical axis
Is the maximum range in kilo-
meters for a specific take-off an-
gle in degrees, while the right
vertical axis is the maximum
obstruction height in feet vs.
take-off angle. Three range vs,
take-off angle curves are plotted
for different reflection heights,
and each curve is labeled with
the height (100, 300, and 500
kilometers). These curves were
computed for an Earth spher-
ical radius of 6371 kilometers. A
**16-Earth'* correction factor
(Earth radius increased by 16) is
sometimes used at HE Applying
that correction would modify
the curves shoum somewhat.
Either the maximum path
^ distance for a given take-off an-
^ gle or the appropriate take-off
^ angle for a specified distance
f can be determined from Fig, 5,
1^ At a take-off angle of 20\ for ex-
<^ ample, the maximum range is
1^ about 2100 kilometers (1300
z miles) for 500-kilometer rcflcc-
S t Ions In the F2 region. The
I range Increases to 4000 kllo-
I meters (2500 miles) at about a
uj S'' take-off angle.
If the path length were 3200
74 kilometers, the appropriate
4SQ0
4000
o
^2m
1G0Q
fiOO
V 5 m
^ J
\ J
V /
r f3i
ill
/l Ml
1
^ /
\ I
\j
*\
\
\
\ I I
V /
V
V y
V
hi
ft ^
OiSTRUCTiON
REFLECnON_ _ _
HEI^KT
__T00km
10
4800
4000 _
zm
1600 1
8Q0
70
eo
90
30 40 50 60
TAKE OFF ATIGLF fDEGREEE)
FIG,4^0MMUNICATI0N RANGE PLOT: maximum range and maximum oijstruction
height vs. take-off angle
take-off angle for 500-kllometer
rellections is about 10'', and its
about 3"" for 300-kilometer re-
flections. Also plotted in Fig. 5 is
a family of five obstruction
height curves. They are impor-
tant in antenna siting, es-
pecially for very shallow take-off
angles (long paths).
Figure 5 shows the transmit-
ted-ray geometry for a signal
obscured by a hill or mountain.
The obstruction with height H
is located at a distance R from
the antenna. The minimum
take-off angle corresponds to
the ray that just grazes the
obstruction as shown. Trans-
mitted or received signals at
smaller take-off angles are
blacked by the obstruction.
The curves related to the right
vertical axis In Fig. 4 show the
maximum allowable obstruc-
tion height in feet vs. the take*
off angle. For example, if the
path requires a take-off angle of
20^ a land-mass or structural
obstruction Va mile away must
be less than 500 feet high if the
ray is to pass without being
blocked. A SOO-foot hUl Va mile
away would obscure all signals
with take-off angles below 20".
Higher obstructions can be tol-
erated if they are further away
At a distance of ^/^ mile, for ex-
ample, the obstruction could be
as high as 1000 feet before
obscuring a ray with a 20^ take-
off angle.
The curves in Fig. 4 also show
maximum range in kilometers
vs. take-off angles in degrees for
the vee. For 100-kilometer re-
flections, the most effective an-
gles are between about 8*" and
25'', The objective in designing
a vce antenna is the placement
of this lobe in this angular
range. The the 8*^ minimum
take-off angle requires that the
antenna bef carefully sited to
avoid lobe blockage by a nearby
hill or structure. The maximum
height of that obstruction can
be only about 200 feet If the an-
tenna is to be located mile
away. This requirement might
easily be exceeded In hilly ter-
rain or near tall buildings.
Step 2 — The apex ang!e
Figures 6 and 7 plot the op-
timum vee apex angle in degrees
as it changes with frequency
and antenna element (radiator)
length. The apex angle is inver-
sely related to both frequency
and element length. Thus,
short elements at low frequen-
cies must have wide apex angles
while long elements at high fre-
quencis can have small angles.
The curves in Fig, 6 are for fre-
quencies of 10. 30, and 50 MHz
with respect to element lengths
in meters, while those in Fig. 7
are for element lengths of 20" 40
and 60 meters with respect to
frequency. Our example vee
must operate over a wide fre-
quency* range (15 to 50 MHz).
It turns out that a given apex
angle is optimum at only one
frequency, not over a range of
frequencies. Therefore* the se-
lection of an optimum apex an-
gle calls for both Judgment and
compromise. The objective is to
select an angle that provides
good performance at all fre-
quencies over the stated range.
The design example calls for a
vee antenna that will fit in a 100
X 100 foot square plot. There-
fore, 40- or 60-meter elements
are too long; only the 20-meter
length will fit. By referring to
both Figs. 6 and 7. it can be
seen that fora 20-meter element
the optimum apex angle at 10
MHz is 1 16". but at 50 MHz it is
54**, It can also be seen that a
good compromise for apex angle
with a 20-meter element over
the 15- to 50-MHz band can be
reached by finding the apex an-
gle for 30 MHz— 69^ That angle
will now become the trial value »
and it will be retained unless the
gain or pattern falls to meet the
design objectives. In that case,
the selection process must be
repeated with another choice
for the apex angle.
Now look at the vee input re-
sistance at the design apex an-
gle. Figure 8 is a plot of input
resistance in ohms (R vs. fre-
quency for apex angles of 40^^*
70\ and 100^ The input resis-
tance value for a 70"^ apex angle
at 30 MHz is about 690 ohms.
(The vee is generally considered
to be a 600-ohm antenna, so
this is close to a match). The
value of Input resistance in-
creases to 780 ohms at 15 MHz
but drops to 630 ohms at 50
MHz. For design purposes. 690
ohms can be selected as a repre-
sentative average value of R(„
over the 15- to 50-MHz band.
The value of is needed to
specify the vee input balun. Be-
cause the vee is a balanced radi-
ating system, feeding it with an
unbalanced coaxial cable re-
quires a balun ta balanced to
unbalanced transformer).
Matching a 50-ohm transmitter
to 690 ohms requires a 14:1 bal-
un. which can be made by wind-
ing magnet wire on a ferrite core
or purchasing the component
complete,
A value for R^^ is also needed
in the specification of each ter-
minating resistor. Those values
are RiJ2 (345 ohms for the de-
sign example). Select the stan-
dard value closest to 345 ohms.
That value is not critical be-
cause Rjj, changes with fre-
quency.
The tentative geometry for the
20
50
60
30 40
ELEMEmr LENGTH (MFHRS)
FIG. 6— OPTIMUM APEX ANGLE for sEoping-vee antennae plot of optimum angle vs.
element length at three different frequencies.
120
110
100
MJ
S 80
m
' with todays crowded
UHF bands. The converter
draws about 27 miUiamperes
from a 13,2-volt DC source, so it
can be used in portable and
mobile applications. An extra IF
stage gives an overall gain of
about 25 dB.
Circuitjy
Figure 1 is a block diagram of
the downconverter It consists
of three active slages and a pas-
sive diode double-balanced mix-
en The input signal is first fil-
tered so that only signals
centered around 430 MH/ are
fed to Q 1 , an RF amplifier w ith a
20-dB gain and a noise figure of
L5 dB. Qi is an NEC 25137 gal-
lium-arsenide field-effect tran-
sistor, or GaAsFET The ampli-
fied signal in the 420-^50 MHz
range Is fed to a double-luned
bandpass filter. The overall
bandwidth of the RF stage is
about 12 MHz, which is suffi-
cient to cover the most fre-
quently used part of the ATV
band (426-439 MHz) without
retuning. For operation over the
entire 420-450 MHz band, you
may have to repeak the filters to
tune in weak signals.
The amplified signals are
mixed by a diode double-bal-
anced mixer with an oscillator
signal (generated by Q2) that is
nominally 60-70 MHz lower
than the received frequency. A
2-dB pad is used between the
osclUator and mixer to reduce
interaction* The IF output from
the mixer is fed to a low-pass
filter that cuts off at about iOO
MHz, That reduces UHF signal
feedthrough. Amplifier Q3
boosts the IF signal at 60 or 66
MHz (channel 3 or 4) by about
-H 15 dB. The output of Q3 is fed
to the TV receiver being used as
an IF amplifier
Figure 2 shows the schematic
of the downconverten The input
signal from J 1 is applied to a tap
on LI, the input (antennal coil.
LI is nominally a 3- turn coil and
the tap is at % turn so that the
voltage applied from Jl is
stepped up four times. Capaci-
tor CI tunes LI to resonance,
and Is also connected to gate 1 of
Capacitors C3 and C4 provide
FTG. 1~00WNC0NVERTER BLOCK DIAGRAM. H consists of tti me active stages and a
passive diode cloyble~batanc#d mlxen
J2
ouTPirr
I
8
I
UJ
80
FIG. 2— DOWNCONVERTER SCHEMATtC, The input signal rrom J1 Is applied to a tap
on LI. Capacitor C1 tunes LI to resonance and passes the signal to 01 » an NEC 2St37
GaAsFET.
RF bypassing for the source of
Ql, and Rl provides self-bias for
Ql. Gate 2 of Ql is biased by
network R2. R3 and R4. An ex-
ternal gain-control signal
(which is usually not required)
can be applied to the junction of
R3 and R4 if it becomes neces-
saiy to reduce the gain of the
converter on very strong sig-
SEE TEXT
nals. A DC voltage of +6 volts
will cause full gain, and -6
volts will cause nearly a - 40-dB
reduction in gain. The voltage
can be derived from an AGC cir-
cuit, if necessary, but a potenti-
ometer can also be used.
Capacitor C2 provides RF
J1
INPUT
J1
DOWN
CONVERTER
TO RIO *
(REMOVE Rl 4)
SEE Fia2
REMOTE
TUNING
2-m
,01 mF
J3
t4-24VDC
uPToaor
IF OUT
+ 12V
MAINCONVERTEi
StJPPLY
m
1H759 *
12VZEHER DIODE
R21
IK ^
FATHER PfiOOF
ANTENNA BOX
C34 X
.oimF
R20
IK
C33
TRANSMI^IOH
LINE
(R^AAJ)
{R659A/U)
CONNEaOR
iBNCORn
R2Z
12K
R23
lOK
CONVEHTtR
TUNING
L11 ,
i8^H :
CHOKE
4( 4>
C35
.OOIhF
J4
TO TV RECEIVER
cm OR CH4
C3&
IOOhF"
07
CONVERTER
POWER SUPPLY
26V
TUNING (
BOX
Fia 3— THE DOWNCONVERTER can be supplied with an external DC voltage for
remote-control tuning.
f
A
G (J
O O
REMOTf
COPPER
FOIL
TAPE ™
.TUNING
^ IF USED
I
INPUT j
in G t
USE imm
R14
POSIliON
w I!
RG. 4^PARTS-PLACEMEHT DTAGRAM. Thfs Vayout must t>e followed exactly to dupli-
cate the performance of the down converter. Some components mount on the solder
side of the board as shown in Rg* 6.
grounding for gate 2 of Ql» and
R5 reduces any UHF parasitic
oscillattons. The drain ofQl is
connected to a tap on L2, which
is part of the bandpass filter net-
work. Capacitors C7 and C8
provide RF grounding for the
cold end of L2. DC bias is fed
through R6, Under normal con-
ditions* the drain pin of Ql will
be at + 10 to +11 volts DC.
Capacitor CIO couples the
signal from the first tuned cir-
cuit (C5-L21 to the second tuned
circumC6-L3). The vakteof CIO
is very small (0,6 pF): It deter-
mines the degree of coupling be-
tween L2 and L3. It is made
from a small piece of PC board
material and is mounted on the
bottom of the main board, Asig-
nal from a tap on L3 Is fed via
test jumper JUl to mixer ML
The local oscillator (L.O.) signal
from Q2 Is also fed to the mixer
IVansistor 92 is the local os-
cillator for which R13, Dl, C14,
and C16 provide a stabilised 9
volts DC/ Because Q2 is a PNP
transistor, it allows the collector
to be DC grounded, which is an
advantage in this type of os-
cillator circuit. Resistors R7
and R8 provide base bias for Q2,
Cll provides a solid RF ground
PARTS LIST
All resistors are Wwatt, 5%, un-
less otherwise noted.
R1— 180 ohms
R2— 100,000 Ohms
R3, R4— 220,000 Ohms
RS— 10 ohms
R6—220 ohms
R7— 6800 ohms
R8— 2200 ohms
R9~330 ohms
RIO— 10,000 ohms
R11— ISohms
R12— 390 ohms
R13, R15^70 Ohms. V4-watt
R1 4— 10,000 ohmSi potentiometer
with shaft
R16— 1000 ohms
R17— *70O Ohms
R18 — 470 Ohms
Capacitors
CI, 05, 06, 09—2-^10 pF trimmer
C2-04, 07, Oil, 014, 025^70
pR chip
Ce, C20, 026, 027—0.01 disc
CIO — 0.6 pF (mus! be handmade,
text)
CI 2—1 pF, NPO disc or chip
C13— 3.3 pF, NPO disc or chip
CIS— 10 M-R 16 volts; electrolytic
C16, 018^9 pF NPO disc
C17— 68pR NPO disc
CI 9-^70 pR disc
021— 18pR NPO drsc
C22— 56pRNPOdiSC
C23— 10 pR NPO disc
C24 — 470 jaR 16 volts, electrolytic
Semiconductors
D1, D4— 1N757A Zener diode
D2— MV2103 varactor diode
D:^1N4007 diode
01— 25137 GaAsFET (NEC)
02— MPSH8t NPN transistor
03— 2N3563 NPN transistor
Other components
LlH_a— 3 turns of 20 AWG tinned
Wire (approx. 0.025 ^JtH. see Fig.
5}
LA — part of PC board etching, see
text
L5— 18 M^H RF choke
L5, L7— a turns of 22 AWG enam-
eled wire wound on No. 8 screw
(approx. 0.095 |iH, see Rg. 5)
L6— 9'^ turns of 22 AWG enameled
wife wound on No, 8 screw, with
fenite slug (see Frg. 5)
Ml— MCL SBM mixer
Jt, J2— F connector
Miscellaneous: PC board, yie-inch
copper-foil tape, coaxial cable,
project case, 12.6-volt DC power
supply, solder, etc.
Note: The following items are
available from North Country
Radio, P.O. Box 53. Wykagyl
Station, New Rochelle, New
York 10804:
• A kit of parts to build the
downconverter (Includes PC
board and all parts that mount
on U, J1 and J2, and wire to
wind all inductors (metal case
and power supply not in-
cluded)— S59.50 ^ S3,50S&H
{Note that none of the parts
shown in Fig, 3 are included
with the downconverter kit,)
• Metal case as shown-
$12,50
• 2-watt ATV transmitter kit
wi^ a 439-25-MHz crystal fsee
Radto-Electronics. June and
July 1989)— $110 - S3 50 S&H
• A 0.5-watt, 9-volt transmitter
kit with a 439.25-MHz cfystal— 1
S112 ^ S3.50 S&H '
• Linear amplifier kit to boost
the output of ATV transmitter to
15 watts (see Radio-Elec-
tronics, August 1992)— $79.50
+ $3.50 S&H
• Crystals for channels 14, 15,
16, 17, or 18 (for test purposes
only)^S7.50 each
New York residents must add
sales tax.
COMPONENT SIDE FOIL PATTERN.
for the base of Q2, and R9 pro-
vides emitter bias. Nominal cur-
rent through Q2 is about 5 to 6
SOLDER SIDE FOIL PATTERN.
mtiliamperes. Capacitors C12
and C13 provide a feedback net-
work for Q2.
Components C9 and L4 (a
length of mlcrostrJp line etched
on the PC board), together with
C23 and varactor diode D2.
form a circuit that can be tuned
via the bias on D2 over the
range of 350 to 390 MHz. de-
pending on the setting of C9.
Therefore, 92 will oscillate over
that frequency range, because
positive feedback is provided by
C12 and C13, and Q2 acts as a
grounded-base amphfien Os-
cillator output is taken ttirough
R17 and R12 to mixer ML The
level at terminal L of the mixer is
about 0.3 volt RMS, Resistor
Rl 1 is connected to a tap on L4.
which also provides bias return
for the collector of Q2, because
11 is at DC ground.
The output from mixer Ml at
60 to 70 MHz (the difference fre-
quency between received signal
and L.O. frequency) appears at
mixer terminal X. There is
about a 7-dB loss in the mixer
Coil L5 provides a DC return for
the mixer IF port. A low-pass fil-
ter made up of C 16. L6. C 1 7, L7.
and C18 eliminates any remain-
ing UHF signal components ap-
pearing at terminal X. Tran-
sistor Q3 is an IF amplifier
stage, which is biased by R13»
Ri4. and R15 to a Vce of 8 volts
and a collector current of about
8 mA. TYined circuit L8. C2L
and C22 can be tuned to either
channel 3 or 4. The signal from
the low-pass filter is coupled to
Q3's base via C 1 9 . Tl^slstor 93
provides about a l5-dB gain; its
output signal appears at J2,
Power for the downconverter is
supplied through D3. which
protects against reverse volt-
ages, and C24 and C26, which
bypass and noise.
Resistor RIO couples DC bias
to D2 supplied from tuning-po-
tentiometer R14. Components
R16. D4, and C25 provide 9-
volts DC for that purpose. If de*
sired, RIO can be supplied \vith
external DC for remote-control
tuning, or to allow the down-
converter to be mounted close to
the antenna. That is commonly
done to reduce transmission-
line losses between the antenna
and converter — losses run high
at 450 MHz unless very expen-
sive transmission line, such as
'/2-inch hard line* is used. If you
arc planning on remote-control-
ling the converter, install R14 so
it's easy to move*
FIG, 5--COILS LI, L2, AND 1.3 are three turns eacli of 20 AWG tinned wire wound
around a Ho, 8 screw and stretched to 0.3 inch. The lead from J1 has its center
conductor soldered to LI st turn from the grounded end. Resistor is soldered
turns from the end of L2 that connects to R6, 07, and CS. Coll L3 Is tapped at 1 turn from
the grounded end. Colts L6 and L7 are 6 turns each of 22 AWG enamelled wire wound
on a No, 8 screw. Coil L3 Is turns of 72 AWG enamelled wire wound on a No. 8 screw
with a ferrlte tuning slug added.
FIG. 6^ALL CHIP CAPACITORS, ao (see Fig. 8). and Q1 mount on the solder side of
the board* The markings on 01 face the component side of the board.
I
JO
3
8
z
83
IS HOE
/
PIECE or WIRE
PC BOARD
WRAP fOlL TAPE
arouhd edge area of pc-
BOARD AHD SOLDER ALL AROUND.
RG. 7— ALL HOLES MARKED "G" Ifi Rg. 4 must have jumper wires passed through
them that are soldered on both sides of the PC board as shown here. Also, both sides
of the board must be grounded together with copper^foil tape as shown.
RG, 8— TO MAKE C10. take a small
square of G-10, 0.062-inch PC board ma-
terial and trim it to a Vi 6-inch square. In-
stall it on the solder side of the board in
the iocation shown fn Fig, 6.
RG. 10— PEAK THE CONVERTER for a
response as shown here. By trimming
CIO with a file you can experiment with
the coupling and resultant bandpass
shape*
Ra 9— THE AUTHOR'S PROTOTYPE. The converter should be mounted in a metal
box, weatherproof if outdoor use is intended.
Figure 3 shows how J2 can be tlie ATV receiver station. The ca-
connected to a long coaxial ble is isolated from ground and
transmission line that runs to can therefore cany a DC volt-
age. The DC voltage is im-
pressed on the cable as follows:
A nominal 26-voll power source
at the ATV receiver station is
connected to Q?, a 2N2222 NPN
transistor used as an emitter-
follower. Resistors R22 and R23
produce a variable voltage of 14
to 26 volts at the base of Q7,
whose emitter will follow the
voltage. Power is supplied to the
cable through Lll. and by vary-'
ing potentiometer R23* the volt-i
age applied via R22 to the cable
at J3 can be adjusted between
14 and 24 volts. Capacitor C35
prevents any DC voltage from
appearing at J4.
The DC voltage is taken off
the cable via the ISp-H RF choke
LID. Capacitors C30 and C31 re-
move noise from the DC voltage
and provide an RF ground.
Positive voltage is fed to the
downconverter via the cablets
center conductor and the outer
shield serves as the negative
supply lead; It is grounded to
the case and ground foil.
The DC input is fed to D6, a
l2-volt Zener diode (a 1N759
can be used). Capacitors C33
and C34 filter any noise from
the voltage which wiU be 12 volts
less than the voltage on the
coaxial transmission line ( + 14
to +24 volts), or +2 to +12
volts DC. That is fed to RIO,
which feeds the tuning voltage
to the dowTiconverter varactor.
By varying the DC voltage on the
transmission line between + 14
and +24 volts, not only can the
downconverter be powered, but
it can be remotely tuned to a
desired frequency as well.
Note that the components
shown in Fig. 3 are not part of
the downconverter board, and
they are used only if remote op-
eration is required.
Construction
The PC board material (G-10*
0*062 inch thick glass epoxy)
and layout must be followed ex-
actly to duplicate the perfor*
mance of the downconverten
The stray capacitance, coupling
between elements, and L4 are
all integrated into the design of
the board. Any layout devia-
tions can change those specifi-
cations. The foil patterns are
continued on page 109
HARDWARE HACKER
Apple's PhotoGrade, electronic halftones, consultants network,
marketing your Ideas, and two great new books.
HON LANCASTER
Oh. the times, they are a-
changing. We seem to
have a mix of mafly bad and
leal^ awesome stuff coming down
ately. Lets start off with some of
the sadder vibes...
Heathkit has recently discon-
tinued production on most of its
electronic kits. Its the end of an era
for sure.
But a funky little outfit called
Musty Manuals is setting out to
stock and make available all of
those older Heath assembly books
and instruction manuals. And lots of
exciting hacker kits are being made
available from such outfits as PAIA.
Old Colony, and Micru Mint Plus,
of course, through several of the
advertisers in this magazine.
The technical paperback book
field (especially the non-computer
titles) is clearfy not well Sams is
essentially gone, bought out by
Macmillan and triaged into an eth-
ereal shadow of what once was the
most respected and diversified
technical book publishers in the
world. 748 has been purchased by
McGraw-Hill and become a subsidi-
ary. I have been getting plenty of
helpline complaints about several
sources that offer dated and inaccu-
rate titles. Believe it or not. your IRS
is now paying publishers to shred
books, especially old technical pa-
perbacks, through an obscurB in-
ventory ruling that has totally
decimated long-term back lists and
older technical titles.
But — an incredibly exciting new
opportunity called Book^on-de-
mand publishing is emerging in
which you can pnDduce first-quafity
paperback and hardback books lit-
erally on your kitchen table when
and as f/jeyare ordensd. WiEh a "for-
ever" backlist, no IRS inventory
penalties, and no lower limit to the
total number of sellable volumes
needed. And it also includes such
exciting possibilities as a 90-per-
cent authors royalty and rapid CD-
ROM distribution. Much more on
this on GEnie PSRT.
Very alarmingly, some community
colleges are cutting back on or out-
right eliminating their electronics
departments. And many electronic
service and repair trade journals
have vanished without a trace.
But — we now have got the richest
and most incredible variety of cheap
new chips to play with. Anywhere.
Ever, We have major breakthroughs
in hacker drrect^oner printed cir-
cuits. We have a brand-new Elec-
tronics Now format with new
features and fresh ideas that con-
tinues the oldest ongoing elec-
tronics magazine publishing house.
And we are something like a scant
eight years away from hardware that
can surpass the human brain in logic
and analysis capabilities.,
Right now is certainly the great-
est time everto be getting into hard-
ware hacking in a very big way.
Electronic halftones
I've recently been playing around
with the new LaserWriter G and am
very impmssed with its new ability
to print medium- to high-quality pho-
to halftones. So, I thought we might
review what is involved in the laser
printing of photos in general, and
see just why Apple's neat
PhotoCrade process seems to beat
out brute-force methods — and how
we can do even better.
NEED HELP?
Phone or write your Hardware
Hacker questions directly to:
Don Lancaster
Synergetics
Box 809
Thatcher, A2 85552
(602) 428-4073
Many of those previous-genera-
tion laser printers were 300-DPI de-
vices, capable of placing or not
placing 300 whole dots per inch uni-
formly along any one selected laser
scan line. That translates to 90.000
dots per square inch, or a tad over 8
million dots on a standard page. If a
dot is only black or white, it can
usually be represented on the page
bitmap or in your frame device as a
single bit. Thus, around a megabyte
worth of memory must be reserved
for your full-page bitmap at 300-DPi
resolution.
The obvious big dilemma in rais-
ing your laser-printer resolution is
this: As you go frcim 300 DPI to
1200 DPI, you could end up requir-
ing sixteen times the memory! And
your page makeup times could end
up sixteen times as long! Yet
"mone" resolution is perceived to
be a big user need. Or is it?
Actually, laserprinting resolution
is pretty near as highly overrated as
Peterbilt tnjcks or teenage sex. But
that's another story for another
time. I strong^ feel that higher reso-
luHon is not worth losing genuine
Adobe Level II PostScript, duplex
printing options, lowper-page print*
ing costs, mainstream technology,
good third-party supply sources, lo-
cal hard-disk support, or any sleep.
A pooriy scanned photo (or one
that s not pnoperiy histogram equal-
ized) will end up looking even worse
on the premium machines. ^
One zero-cost way to increase ?
your printer s resolution when you'd g-
like "camera ready" art for conven- H
tional printing; Just work oversize ^
and then photoneduce. Most of my
Hardware Hacker figures are ^
printed at 133 percent normal size 3
and are then reduced here for an g
effective resolution of a scant 400 ^
DPI. Yet I feel they look as good as i
most of the other technical figures.
An easy way of making a 300-DPI 85
000
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omm
omm
ooo
000
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omo
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omo
••o
••0
FIG. 1— A LASER PRINTER can fake a halftone by grouping dots Into a larger "celL" In
this example, a 3 - 3 pijtel array forms a cell that can have ten gray levels, including
black and white. On a 300-DPI printer, this would form a "100 line, 0 degree" halftone
screen*
cepts and stores a few of the scan
fines on their final way out to the
laser scanner By analyzing a nnatrij<
foimed FrDm the nearby dots on ear-
Iter and later lines, certain dot posi-
tions are delayed by one-half a dot
following a smoothing algorithm.
The result is a really big improve-
ment in most typography and some
graphics, especially for rBproducing
slanted lines.
Despite all the hype, the circuitry
involved is simple and cheap. And it
can end up totally independent of
the imaging model or language in
use.
But plain old smoothing can't help
halftone photos, and it may even
to
printer look belter is to do a plain old
smoothing job. That concept was
pioneered by Hewlett-Packard as
Resolution Enhancement Tech*
nology.
Apple (and many also-rans) have
copied this idea. On the LaserWriter
G, Apple calls it FlnePrint.
The smoothing is -done by a
custom integrated circuit that inter-
NEW FROM
DON LANCASTER
HARDWARE HACKER STUFF
Hardware Hacker Reprints J1 or Ml 24 .SO
Midnight Engineering Reprinlv
mcredible Secret IJoney Machine
CMOS Cookbook 24. SO
rru Cookbook 24. so
Active Ffltor Cookbook 19>5D
fi^fcro Cookbook vol I or II 19,50
Lancaster Classlca Library 119.50
A pp la Wri r CoO kbo ok 19.50
POSTSCRIPT STUFF
Ask The Guru Floprlnti I, II or III 24.SQ
LaserWriter Secmla (llc/Mac/PC} 2§.50
PostScript Show & ToM 39.50
(ntro 10 PostScript VHS Video 39.50
PostScflpt Seglnner Stuff 39.50
PostScript Cookbook ( Adob«) 1 5.50
Pos tScri|it Re I . Ma n u If 1 1 ( Ad ob«} 2 B.50
PoatScT^pl Frograrn Deilgn (Adotw) 22.50
Type 1 Foni Format (Adobe) 1S.50
La^fWrrter Relerencc (Apple) 19,50
Real World Posticr^pt {Uolh) 22.50
P □ stSc ript V i s u al A p p rose h {Sm t1 h) 22.S0
Thinking in PostScftpt (ft old) 22,50
UAdst PS Pgrmmg (Holtzpang) 29.^0
Th e Whole Works (all PostSc ript) 349 . SO
BOOK-OK^DEMAtJD STUFF
Book-an^cmantl foaourcfl kit 39*50
GEnle PSRT seniplor {WoimdPC) 39.S0
FHEE VOICE HELPLINE ViSA/MC
SYNERGETICS
Box a09-RE
Thatcher, AZ 85S52
C602) 426-4073
i
T
i
_U-
u:
TTTT
±f
I I M i i
300 SPK 0 degroes St 2 SPI, AS degrees ISO 3PI, 0 d^graos 134 SPi, 27 degrees
2 §rays 3 grays 5 grays G grnys
106 SPI. AS degraes 100 SPI, 0 degress 65 SP1. IS degress 83 SPI. 33 degrees
9 grays 10 grays 11 grays 14 grays
Q:-La-vO: :
75 SPI, 0 d« greet
17 grays
73 SPI, 14 degrees 71 SPI, 4S degrees 67 SPf, 27 degrees
18 grays 19 grays 21 graya
60 SPI> 0 degreeB
2S grays
eo SPI, 37 degrees
26 grays
SO SPtp IB degrees SB SPI, £3 decrees
27 grays 30 grays
S3 SPI 4S degrees
33 grays
m
50 SPI, 31 degrees
3S grays
ocuuutp
ODOjonct
oooooo-
opo"0"ao':
O,Q0.O,QQ:
oooooo-
50 SPI, 0 degrees
37 grays
49 5PL 10 degrees
39 graya
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FIG. 2— THE AVAILABLE SPOT PATTERNS for a typical 300-DPI PostScript pnnter.
Note that ttiese are th© ONLY dense patterns available. You'll get one of these re-
gardless of what you ask (or Note the perfect tiling.
luft. Let's look further at.,.
The halftone process
There is only one method to print
something that is truly gray on the
>age. And that is to use gray ink.
Xnd each different shade of true
jray will need a different gray ink
md another pass through the print-
ng press. Since this is clearly not
jood. printers have long used a
lalftone process instead.
The halftone process consists of
3rinting lots of different- sized black
iots very near to each other The
iots are carefully spaced to be less
:han the ^'s angular resolution,
nstead of seeing the rndividual
liotSn your eye averages out the
□lack dots and the white back-
ground and perceives an average
gray level. The higher the ratio of
^hite to black, the lighter the gray,
and vice versa- Let's try it out. Look
at a gray portion of any black and
white photograph or tint box in this
magazine. While it looks gray with
the naked eye* under a nnagnifymg
glass you'll see all the little dots that
make up the /la/ftone. The dots are
aJI black.
To print any photograph, a special
screen is used on the litho camera
to convert gray values Into collec-
tions of black dots of varying size.
Traditional printers will spec their
screen size as the number of half-
tone spots per inch. Sonne popular
ones include 85 spots per inch for
tabloid news and the 120 spots per
inch for most magazines of Elec-
tronics Now quality.
Even higher spot densities are
used on premium magazines. But
they require special inks, coated pa-
pers, and extreme attention to de-
tail. Note that even the higfjest spot
densities used are nowhere near
300 spots per inch!
A second halftone parameter is
called the screen angie^ It turns out
that the human eye is very good at
picking out horizontal and vertical
lines, but rather poor on resolving
diagonals. Since the halftone pro-
cess introduces visual artifacts, it is
often best to set your black-and-
white screens on a 45-degrHe an-
gle. In color printing, the halftone
screen angles become even rnore
critical if they are to eliminate objec-
tionable Moire patterns.
Several methods can be used to
fake halftone screens on laser
printers. One method is to group all
the possible laser dot positions into
larger spots that I II call a ceiL Figure
1 shows you how a 300- DPI printer
can use nine dots to make cells of
100 spots per inch. This particular
cell has a screen angle of zero. As
you can see, there are ten possible
gray levels here, including black and
white.
We can immediatety see that we
could use 36 dots to form 50-spot-
per-inch cells. And those cells
would give us 37 possible grays.
Clearly, w/e have a tradeoff between
the number of cells per inch and the
number of available grays. Use too
few cells per inch, and youll end up
with the "Sunday Funnies" effect
with very grainy dots. Use too few
grays, and you wrill so/anze with ob-
vious (and often objectionable)
steps between each possible gray
level.
The gray-level resolution of your
eye depends on context and con-
trast, but a number slightly over 256
gray levels is possible. But. be-
cause of the stupendous costs of
exceeding 256 grays, most experts
agree that eight bits of gray scale
resolution is enough even for pre-
mium images. Television some-
times might get by with as few as six
bits, good for a mere 64 gray levels.
The obvious next question is
"How good can our halftones image
at an unenhanced resolution of 300
DPI?" Ignoring the obvious answer
of "Not good enough." we'll then
go on to ask "What can we do about
it?"
PostScript to the rescue
I have found that the PostScript
generaUpurpose computer lan-
guage has some really great ap-
proaches to electronic halftones.
Those involve their setscreen and
image operators, among many
others. PostScript uses some imag-
ing f//es that determine the screen
angles and frequencies. Since
these screen tiles must all abut
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z
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88
each other perfectly and still must
obey integer (whole numbers oniy)
math, there are very definite limits
lo which 300-DPI tiles are and ane
not possible. If you ask for some
halftone cell angle or frequency thai
is simply not physically possible,
PostScript will substitute the near-
est handy one.
Figure 2 shows you the available
denser halftone cells as used on
most popular 300-DPI PostScript
printers. Figure 3 shows you the
secrEt gray map for all of the "hid-
den" PostScript grays.
Typical PostScript users and
most applications packages blindly
insist on using the seventeenth
most putrid PostScript gray avail-
able. While this is often incorrectly
called a 60- DPI screen, its effective
resolution is only 53 dota per inch.
There ane 33 grays with this default
screen.
That sort of explains the "Sunday
Funnies" effect of most poor^ done
PostScript screens. And one of the
biggest reasons why' people feel
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they need "more" resolution. When
in feet, their grays can all get in-
stantly and dramatically improved
by using a few dozen keystrokes!
Ferinstance, the best PostScript
300 DPI halftone screen for typical
graphics is a 106 DPI, 45-degree
one which gives you absolutely
beauttful grays. Sadly you'll only get
ten of those grays, but the lightest
ones are very good for graphics.
Two other quite useful 300 DPI
secret PostScript grays of interest
are the 85-line and SS-degree '^re-
progray" useful for oversize cam-
era-ready art. and the 135-lsne, 2
degree "india ink wash" gray. Tf
latter gives you only six gray leve
and requires a car^eful selection
toner and paper. But the results a
stunning.
One way to do a best PbstScri
gray is to enter these keystrokes ^
PostScript commands,..
106 45 dup mul exch dup mul
add J.O exch sub setscneen
The first number is your cell fr
quency: the second is your angi
The details of where and how yt
enter these code lines depend c
so
BS
60
BB
70
75
60
85
U
c
90
k
m
a.
95
in
o
100
■D
C
105
2*
110
c
o
"O
115
c
est graphics gray is 106 DPI al 45 degrees.
DIGITAL VIDEO STABILIZER
EUMIHATES ALL VIDEO COPYGUAROS
Old 300 DPI
pixel s\ZB
new 600 DP!
pixel size
{too DPI. 0 degree halftone ceil shown)
RG. 4— BOTH QMS AND IBM/LEXMARK chose the ^'brute force" 600-DPI method to
improve their PostScnpt photo halftones. The original 1Q0-DPJ spots a I towed 10 gray
levels; the new ones allow 37. There Is a 4 x speed and 4 y- memory penalty for the
modest (but certamiy welcome) improvement.
-S' bitmap bitmap '2' bitmap 'V bitmap
(100 DPI, 0 degree halftone cells shown)
FIG. 5-*THE APPLE LASERWRITER G remains at 300 DPI, but it uses four bitmap
memory planes that allow one of sixteen pixel dot sizes. That permits 144 gray levels at
100 DPI for good- to better-grade photo halftones. Or 128 gray levels at the more
popular 106 DPI and 45 degree screen.
your PdstScript pnogramnning style
or the applications package you
have. Call me if you need any further
help on this.
No. none of those screens can
give you any high-quality halftone
photos. But the 75-line screen can
give you a recognizable "auto shop-
per" quality photograph. Especially
if the scanned image has been prop-
erly histogram-equafized.
Three key points: The halftone
dots used in everyday printing are
much coarser than 300 DPL Some
excellent graphic PostScript grays
are available at 300 DPI. They need
only a few dozen simple keystrokes
for their activation. And our halftone
photo quality, when given any prop-
eriy image processed input, doesn ' t
miss by that much.
So we can potentially add only a
little to 300 DPI and gam enor-
mously on halftone photo quality.
Both QMS and IBM/Lexmark
picked the brute force method. As
Fig. 4 shows us, they switched to a
600 DPI double resolution and then
swallowed the 4:1 speed and menri-
ory penalties. At 100 cells per inch,
you now have 37 gray levels. Or 50
gray levels at an SS-cells-per-inch
White watching rent-
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density. That could make the dif-
ference between lousy and not half
bad photo halftones. Especially
given a proper digital image pro-
cessing.
Apple has chosen the mane ele-
gant PhotoGrade method shown in
Fig. 5. They remained at 300 DPI,
but added three extra bitmap mem-
ory planes for a total of four. Then
they modulated their laser dot size
to one of sixteen values. You now
can have sixteen times as many po-
tential gray levels as you did at 300
DPI with only a single memory
plane. At 106 DPI you now have a
much better 129 gray levels avail-
able. That is equal to a brute force
resolution of 1200 DPI!
Thene is only a negligible speed
penalty, since all four memory
planes are written in parallel by
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custom-designed LSI chips. And
while you retain the same 4 x mem-
ory penalty as a brute force 600 x
600. you1l get four times the effec-
live resolution!
The result? Good to better photo
halftones out of any plain old 300-
DPI laser-printer engine. Especially
With premium toner and properly
scanrted image processing. The
PhotoGrade is also upgradable on
older NT and NTX printers with a
simple plug-in board.
Can we do better?
1 think we can. At least in theory.
For any 100-spot-per-inch tile at
plain old 300 DPI, we are using nine
bits lo call out onfy 10 different spot
values. Since nine bits could repre-
sent 512 different state values> the
memory use efficiency is a tad un-
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der two percent. Wowie gee!
The PhotoGrade does
ridicufously worse. Here we are ask-
ing 36 bits to call out a mere 144
different gray levels. Since thirty-six
bits can yield us up to
68 J 19.4 76 J36 different states,
our memory use efficiency is essen-
tiaily zervl Thus, virtually all of that
Apple PhotoGrade memory bitmap
is totally wasted!
Instead, let's go back to, say. 100
spots per inch at a plain old 300 DPI .
Once in the center of every desired
halftone spot, put out a single laser
dot having 512 possible srze vaiues.
Presto. A mind-blowing total of 512
grays at 100 DPI; Or a perfect 256
grays up at the usual 106 DPI] This
is for photo halftone dots only; you
would still be able to do special
screens and weird spot functions
the old way. Patterns, too.
For us to make full use of what
seems theoreticaliy designable. you
would need some special automatic
mode sensing for the halftone
areas. And a diamond-shaped laser
beam whose diameter could be
controlled over a 25*decibel or 16:1
range, Down from a maximum
slightly under three times larger
than is now used. None of those
needs seems a really big deal.
Thus» it should be theoretically
possible to build a SOO-DPI
PostScript laser printer with out-
standing photo halftones. A 1697-
DPl equivalent. At zero speed or
memory penalties. Hmmmm...
I have posted lots of halftone and
secret gray study examples to
GEnie PSRX especially my files
129. 141. H4. 179. 180. 231. and
239. IVe also uploaded some high-
quality images that you can play
with, either inside or outside
PostScript. In particular, check out
LENA.PS. MANDRILL.PS, and my
enhanced LENAHISTPS.
Marketing your products
I was pleasantly surprised to find
that the leading invention marketing
firms are now publishing their track
records^ — up front in their initial mail-
ings. One of the oldest and largest
discloses: Of the ideas submitted
and contracted, the odds of getting
a royalty license are 100:1 against,
continued on page 93
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91
AUDIO UPDATE
Format future shock
i
LARRY KLEIN
Are we tost in a forest of new
audio formats? Is there a fu-
ture for DAT, DCC, and the
mmi disc — not to mentton record-
able CD s?
I have always considered myself
relatively immune to the effects of
"Future Shock." As you may recall,
the dreaded FS Syndrome de-
scribes the disturbed and disori-
ented behavior of those suffering
input overload brought on by too
many life changes happening too
fast.
Students of sociology are aware
that the organization of any society
roughly reflects the way that the
people in it make their living. And
the kind of work that people do. in
turn, derives from the technological
level of the society. Since tech-
nology is cumulative, it follows that
change, for better or worse, is inev-
itable. (I could cite historical data for
all this* but for the sake of argu-
ment, just take my word for it). It has
been suggested in other contexts
that the way to deal with the inevita-
ble is to relax and. if possible, enjoy
it. But for many audiophiles. their
fun is threatened by the proliferation
and confusion of many competing
formats.
All this is by way of a psycho-
histoncal introduction to the pres-
ent state of home audio electronics.
In past articles I've looked at the
gj question of new formats and exam-
a ined the factors that make them mto
^ hits or misses. As I see it* the major-
I ity of audio consumers are most in-
terested in a format s convenience
^ and only secondarily in its fidelity.
I Although I certarnly don*t discount
« the very low distortion and noise-
c free qualities of the CD format, its
^ obvious attractions — for the aver-
^ age consumer — mostly reside in its
durability and convenient handling.
S2 My evidence for all this is the fact
that severe! years ago the compact,
convenient-to-use. and relatively
rugged prerecorded cassette start-
ed to outsell LP's despite the LP's
superior sound quality and lower
price. For the same reasons, the
latest figures show that CD's are
now outselling cassettes in dollar
volume. Next years figures will
pnDbably show superior sales in ab-
solute numbers as well.
What does all this tell us about
the relatively sudden proliferation of
new audio formats — and consumer
reactions to them in the past several
years? Are the Japanese (and
others) engaging in a strange rite of
mutual commercial throat-cutting?
For example, no sooner dtd the CD
format establish itself than digital
audio tape (DAT) was introduced.
Although the two formats were not
really competitors any more than
LP s and open-reel tapes were, con-
sumer confusion was rampant. And
consumers stayed av^ from the
DAT format in droves f
Then, in 1986. the word was out
that various companies were work-
ing on a recordable CD. About four
years ago one company held a
press conference during which it
was claimed that their digital record-
er/player would be on the maricet in
about two years — and would cost
less than $500! It didn't happen
then, but recently Carver and Philips
announced the tmrninent release of
a new breed of compact-disc re-
corders. A clue to the target market
for the machine is given in the Car*
ver press release: " Professional
user net price of the PDR-10 is un-
der SB.OOO/^ In truth. I don't have a
feel for the professional in the re-
cording industry, but audio consum-
ers are not likely to be waiting in line
to invest so heavily in an unproven
product with (for them) somehwat
obscure advantages.
Planned obsolescence?
Over the years. I ve occesionall
defended the hi-fi industry again?
the recurrent charge of engaging i
"planned obsolescence." The cor
version from 78 s to LPs* tubes t
transistors, mono FM and record
to stereo all struck me as worti'
white advances in the audio ai
rather than nefarious plots to se
new pnDducts, With today's tech
nologies Tm not so sure.
Is Japan so filled with tech
nologically obsessed marketer
that they compulsively create nev
audio formats oblrvious to consum
er needs and reactions? Is thei
guiding philosophy something likt
the classic advertising agency ap
proach. "Let s run It up the flagpolt
and see if anyone salutes/ ? If so
its an expensive and frequently self
defeating way to run an industry.
Several years ago. the consumer
electronrcs trade pubfication Twia
ran an interview with Hifoki Shimizu
general manager of J VC s Persona
Audio Products Division. Mr
Shimizu's comments were so Star
thngly different from the usual self
serving presentations heard at new
product press conferences thai
they are worth quoting, Shinriizu w®£
troubled by what he called the eth-
ical C!) aspects of today s prolifera-
tion of formats. He suggested that
the industry was coming out with
too many products too fast without
considering the interest — or best
interests — of the consumer DAT
technology, according to Mr.
Shimizu. came too fast and the ap-
plication came later: as a result the
market has not taken off. The ap-
plication should come first, he said.
In his view the most important thing
Is how the new product will fit into
the market.
Other voices of discontent are
heard in the land. A writer in The
PHILIPS' DCC900 will be oneot theHrsi Digital
Compact C«s»ne decks on the marfcet.
New York Ttmes suggested thai the
proliferation of competing formats
is part of a conspiracy involving
Sony CCBS Records), Matsushita
CMCA Records), and Philips to
somehow protect their record-com-
pany noyalties from the pnedations
of rabid home recordists. Clf the re-
cording machines don't sell be-
cause of consumer confusion, they
won't be used to copy copyrighted
material) However, it seems im-
probable to me that the music and
audio-product divisions of a compa-
ny would play those sort of internal
games with so much cash and pres-
tige on the line.
Future formats
Do I have any advice to offer
those seeking to keep their heads
above water in the flood of new au-
dio products? For one thing, read
the articles extolling the virtues of
this or that new format with a critical
eye. Remember that most writers
and editors believe that readers are
automatically turned on by the New!
Experience has shown, however
that large numbers of excited words
devoted to the advent of a new au-
dio format don't refiabty predict its
success.
Given the snowballing of tech-
nology, it s hard to make predic-
tions, but certain developments
seem inevitable. In a science-fiction
story I wrote in 1 977. t predicted that
the turn of the century would see a
fiber-optic cable that linked most
homes in America. Among its many
services would be the ability to call
up any mustcat composition, pop or
classicaL fnom the worid s reconded
library. Separate musical software
as such would be obsolete, as
wouldn of course, the players that
deliver it. I think such a development
is inevitable , and it would finally put
an end to all the format she-
nanigans. Or would it? R-E
HARDWARE HACKER
continued from page 91
and the odds of any positive cash
flow that exceed costs are 600:1
against!
Those figures sound about right
to me. Sometimes I've done almost
that well on my own. And some-
times not. Selling an idea is a real
rough row to hoe. One that could
become a near impossibility if you
are not a fully trained and well expe-
rienced insider knowledgeable
about what is going on in trade jour-
nals, politics, economics, and the
lech literature of the target field.
An invention-marketing firm is
just a hired gun, similar to an ad
agency or a resume- typing service.
You pay them for their time and
effort for such sen/ices ss patent
searches, listings in product news-
letters, and participation in inven-
tion fairs — cash up front.
As we've seen a number of times
in the past, the core problem lies in
the absurd mythology surnDunding
today's patent system. Very simply
patents have little or nothing at all to
do with the selling or marketing of
an idea. For most individuals and
most small-scale technical star-
tups, any involvement whatsoever
with the patent system is virtually
certain to end up as a net loss of
time, energy money and sanity.
Just about all hackers will tend to
grossly overvalue a new idea. At
one time way back in the golden age
of inventing, ideas were occasion-
ally vrorth as much as a dime a doz-
en. Today, they are worth less than
ten cents a bale in ten-bale lots.
Ideas gain value only when you can
clearly demonstrate your end users
actually getting off on them. And
then only when those ideas are
already in some safeabie. competi*
tive. promotable, and distributable
form.
The key secret to selling an idea
is very simple: The buyer must
come to you. For our special re-
source sidebar this month, t have
gathered together some ideas that
can help you to profit from your
ideas.
Two essential magazines are that
Midnight Engineering and the
continued on page t08
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VFX
continued from page 52
MODI BUTTON BUHON OUTPUT
RG. 9— THE VFX PROTOTYPE, Carefully check the board for solder splashes and
bridging before applying pomr.
button and the LED display
should count fast enough so
that all the segments (an "8")
appear dimly tit.
Remove power from the board
and Install the two RAMs (ICS
and IC9). Apply power to the
board. The LED should again
display "6/" Press the shift
button and the LED should dis-
play *0. * If any RAM errors oc*
cur, they will cause the LED
display to increment.
Next Install IC3 and 1C5. Con-
nect your speaker or head-
phones to J2 and reapply power
Press the shift button twice and
a tone should be heard in the
headphones or speaker Install
IC4 and connect a microphone
to J3 , Apply power and press the
SHIFT button three times. Then
speak into the microphone and
your voice should be heard
through the headphones, Ad-
Just potentiometers R50 and
R40 for minimum distortion.
Now that your VFX board is
working, you can change the
DIP switches according to Tkble
I for the other three effects.
As mentioned before, there is
a test mode that can help trou-
bleshoot the VFX processor It Is
activated by setting the DIl^
switches as shown in Ikble 1
and pressing the reset button.
The test mode individually tests
the system RAM, the CODEC,
and the LED display.
In the test mode the external
SRAM is constantly written to
and read, and the number of er-
rors are displayed on the LED. If
the LED display is blank and all
the power supplies are normal,
there is something wrong with
the LED or the driver If the LED
has a number other than zero,
there might be a problem with
the SRAM.
The CODEC data is received
and Immediately retransmitted,
so the microphone input is
echoed back the headphones. If
there is no output or if the out-
put Joesn^t sound like the in-
put, there is a problem- If there
are no other fault indications
and the microphone and speak*
er are working, there might be a
problem with the CODEC, If
nothing happens and the power
supplies are normal, there
might be a problem with the
digital signal processing chip or
the EPROM.
Where to go from here
The VFX processor is intend-
ed to demonstrate in, an enjoy-
able way* the capabilities of
digital signal processing. Th<
four applications programme!
into the VFX board are just fou,
out of many possible applica
tions. The VFX processor hard
ware is capable of bein{
reprogrammed to perform othe:
functions as well. Some of tin
possibilities are speech recognl
tion, active noise cancellation
voice compression/recording
and a spectrum-shifting hear
ing aid.
For example, the VFX pro
cessor could easily recognize
the numbers from 0 to 9 anc
display them on the LED indica
tor That requires that the
speech be converted Into the fre-
quency domain and the spectral
peaks of the sound be compared
with pre-stored templates. The
closest matching sound Is se-
lected and displayed on the
LED. The processor could then
generate the DTMF signals for
that number to make a voice-
activated telephone dialer.
A voice compressor/recorder
converts an audio input into the
frequency domain, picks out
the most prominent spectral en-
ergies, and stores them in data
memory as frequency and am-
plitude. The technique can re-
duce the amount of data that
must be stored compared to
that from conventional digitiz-
ing processes from 6.5K words
per second to 650 to 300 words
per second. The VFX board with
8K words can record approxi-
mately 12 to 25 seconds ot com-
pressed speech.
Active noise cancellation is
being developed for applica-
tions ranging from muffling the
sound of automobile engines
and industrial machines to
eliminating the background
hissing noise In fighter-aircraft
intercom-system headphones*
Similar applications for the VFX
board are being developed. Let
us know if you have any other
applications you would like pro-
grammed into the VFX pro-
cessor. If you are Interested in
programming your own ap-
plications, look into the EZ-LAB
system sold by Analog Devices
that has been referenced in this
article. It is an affordable way to
implement small- to medium-
sized algorithms.. R-E
DRAWING BOARD
Video scrambling.
ROBERT GRGSSBLATT
Looking at a line of video on an
oscilloscope or waveform
monitor can be a real eye
Dpener As we discuss the various
"actors involved in video scram-
bling, you'll need a good under-
standing of video to follow along-
Vou^l also need some equipment to
view the waveform, other than on a
TV set. For a good background on
video, get your hands on the series
of Drawing Board columns I did on
video from January to Novenr^ber
1990. You'll probab^ be able to find
them in your library if you don't have
the back issues.
The starting point for any would-
be unscranribler (hereinafter re-
ferred to as "us") is that scramblers
(hereinafter refenred to as "them")
start out wilh a signal that s exactly
the one we want to wind up with.
Video originates in the clear, gets
messed up one way or another by
them, and is sent to us. Our job is
simply to undo what they*ve spent a
bt of money doing.
You don*t have to be a rocket sci-
entist to mess up video — that is
true both aesthetically and scien-
tifically. The hard part is to do it in
such a way that you can put it back
together again. This means that
there has to be a rigorous ap-
proach — almost a mathematical
one — to tearing the signal apart.
Take a look at — and get intimately
femiliar with — the typical line of vid-
eo shown in Fig. 1. While most .of
the time on the line is devoted to the
picture area, it s the control area
where the real work is done. The
signal in the picture area determines
what you'll be seeing on the screen
but the stuff in the control area is
what teils your TV where to put the
picture and how its supposed to
appear.
The control area is blown up in
Fig. 2. and the information in it is a
graphed function of lime and volt-
age. By the way. most video people
like to talk about "units of video"
rather than voltage for the same rea-
son that audio people like to talk
about decibels rather than voltage.
When the NTSC video standard
v^^as established, the two most
basic decisions made were that it
would range from 0 to 1 volt peak-to-
peak, and that one voltage range
would be reserved for picture and
one would be reserved for control.
As we go through our discussion on
scrambled video. I'll talk sometimes
about video in terms of IRE units
and other times about voltage. The
two are directly related as shown on
the Y axis of Fig. 2.
The bottom line of the picture is 0
IRE units which is about 0.3 volts up
the IRE scale. That point is impor-
tant because it's both the defined
level for black video Cno picture on
Ihe screen) and the upper limit for
any contnDl signals. (There's a slight
ambiguity here when you examine
the coforburst but we*ll get to that
laterJ For the moment, we can con-
sider everything above 0.3 volts as
picture and everything below that as
non-picture.
RG, 1— TYPICAL LINE OF VIDEO. Most of the line is devoted to the picture area, but it^
tlie control area that we're interested in.
SO-
-70-
60-
vm£o
—I 1 r 1 1 1 1 1 1 \ 1 r
O f 2, 3 ^ S 6 7 S 9 /O //
RG. 2— THE CONTROL AREA. The NTSC video standard says that the signal can
range from 0 to 1 volt peak-to-peak.
95
That signal definition is the basrs
for most of the hardware in every
NTSC-Gompatible TV ever made.
Your TV contains circuitry that ex-
pects contn^! information to be be-
low 0.3 volts and picture information
from 0.3 to 1 volt. That s important
because it is the starting point for
scramblers: when you get rid of
some of the control information, a
standard TV can't display the pic-
ture. Remember that the horizontal
sync pulse defines the end Cor, de-
pending on your point of view, the
beginning) of a line of video. If the
TVdoesn'tseeit, it won't know how
to display the line on the screen,
and the result will be that the TV will
end one line and start another one
at some random point on the
screen.
The freewheeling retrace fre-
quency of the TV will come close to
the one sent by the bnDadcasten but
it won't match exactly. What you'll
see on the screen will be something
like Fig. 3. The curved line running
down the center of the screen is the
horizontal interval sent by the
broadcaster
Three things are happening in Ftg.
3. The first is that the line is curved
because the horizontal circuitry in
your TV runs at a frequency that s
not exactly the same as the broad-
cast horizontal frequency. The TV
can accept a certain amount of drift
in the horizontal frequency. Once
upon a time a horizontal control was
built into on the TV so you could
hand tune the TV to the received
signal. Although that control isn't
around any longer (except some-
times as a trimmer on a circuit board
inside the TV), the tolerance is still
there. Modem TV s can automat-
ically lock onto the broadcast hori-
zontal frequency so there s no
reason for the horizontal control to
be accessible.
The second thing that's happen-
ing is that the line is in the center of
your screen. The reason for that is
simple. The TV's horizontal circuit
uses the recerved horizontal pulse
as an instruction lo move the beam
back lo the left side of the screen.
Because the scrambled sjgnal has
anything but a recognizable horizon-
tal sync pulse, the TV zips the line
back to the left side of the screen
whenever it reaches the right side.
FIG, 3— A FREEWHEELING RETRACE
won't match the frequency seni by the
broadcaster. The curved tine running
down the centerol the screen is the horh
zontal iniervai sent by (he broadcaster.
A5K
ASK
^1
OUT
FIG, 4— A VIDEO BUFFER isolates one
stage of hardware from another. The
transistor Is set up as a buffer and the
level of the video can be controlted by
the value of R2.
Because that has nothing to do with
the signal it s receiving, the line usu-
ally shows up at some random spot
on the screen. The TV*s freewheel-
ing frequency is close to the broad-
cast horizontal frequency, so the TV
will start a new tine at about the
same point in the bn^adcast line.
That means you'll see the broadcast
horizontal interval on each line at
mofB or less the same horizontal
location on the screen. The result is
a curved line down the screen.
The thrrd thing happening on the
TV screen is that the colors are
messed up. Because the horizontal
sync Is missing, the TV circuitry
isn't seeing the colorburst in the
right place, so there's no reference
for either the intensity or color of the
picture. The TV then uses whatever
it sees in the colorburst location as
a reference for both the tntensity
and color of the image.
You can see now that by simply
getting rid of horizontal sync, the
resulting video signal will be com
pletely messed up. The best v/ay tc
appreciate thai, and a good way tt
get into video hardware, is to buik
something to demonstrate how al
this stuff really happens. That*s
right, our first piece of hardware \i
going to be something that will le
you scramble video. And. as far a^
the law is concerned. I'm pretty surt
that nobody's going to become ver)
upset.
WeMl need a source or real video
That can be anything from an NTSC
generator to a line-level video signa
from the back of a VCR, You 11 alsc
need a scope to look at the videc
waveform and a TV to look at the
picture. You can do without the let
ter but the former is a must. I'm nol
going to beat you up any more aboui
getting a scope, but if you don't
have one. get one. If you don't gel
one. this series of columns while
informalive. will be somewhat less
than useful from a practical point ol
view.
To get started, because we're
building circuitry that is going to use
an external signal, the first thing we
have to do is buffer it. That is done
for two reasons. The first is that we
have to be able to control the level
seen by our video circuitry, and the
second is so that a wiring ent>r on
the breadboard isn't going to send
unpleasant voltages back to the sig-
nal generator or VCR. The results
could be a bit nasty.
Video buffers are just like any
other buffer— they're simple cir-
cuits that isolate one stage of hard-
ware from another Think of it as
being like an electronic fuse. The
easiest way to build a buffer is with a
single transistor as shown in Fig. 4.
The transistor is set up as a buffer,
and the level of the video can be
controtled by the value of R2, You
can also put a potentiometer in se-
ries on the line feeding the video to
the base of the transistor and trim
the level that way.
Although the NTSC video stan-
dard calls for a signal that's 1-volt
peak-to*peak. most VCR manufac-
turers don't strictly follow that stan-
dard when it comes to a video
output signal. If you put the signal
on a scope, you'll probably find that
it's a bit higher than that. If that s the
continued on page 109
COMPUTER CONNECTIONS
The Cheshire Cat, multimedia, and vision.
JEFF HOLTZMAN
Vision, according to the
American Heritage Elec-
tronic Dictionary, can be
defined in five ways: 1 . The faculty of
srght. 2. Unusual foresight. 3. A
mental image produced by the
imagination . 4. Something, as a su-
pernatural sight, perceived through
unusual means. 5. One of extraordi-
nary beauty.
In the business world, definition 2
is v^hat people usually think of. Ac-
tually, definition 3 is most important.
Persons with unusual foresight help
bridge short-term gaps between to-
day and tomorrow. Persons with
imagination set long-term goals and
directions, and inspire others to try
to move in those directions to
achieve those goals. Companies
are typically founded by Type-3 peo-
ple, and run by Type-2 s.
Starting about 250 years ago dur-
ing the dawn of the industrial revolu-
tion, technical vision and imagina-
tion in the westem world focused on
building tangible items to ease the
time involved in producing, trans-
porting, and defending necessities.
After about 200 years of wide-
spread social effort, most of those
problems were solved, so persons
with visionary imagination shifted
focus to a different set of problems.
From these origins was born the
computer industry.
Early work in that field centered
on doing the same kinds of activities
people had been doing — e.g.. ac-
counting and typing^ — only faster
Things started to get intenesting
when Ted Nelson, Doug Englebart.
and others realized that the comput-
er had created a whole new world, a
"virtual" world. Again the American
Heritage, this time on virtual image:
An image from which rays of re-
flected or mfracted tight appear to
diverge, as from an image seen In a
p!ane minor.
There is a virtual world behind the
CRT. from which imaginaryllghi rays
are diverging, rays that until recently
were visible only to mathemati-
cians, computer scientists, and
soft^vare engineers. Now, thanks to
Nelson and company, and more re-
cently to video games and the Mac-
intosh (and let's not forget Micro-
soft Windows), that Cheshire cat
image is becoming accessible to
more and more people.
Graphics editors let artists reach
in and take hold of some of that
virtual Play-Dough a proprietary
term. On-line references let writers
and researchers tap into the knowl-
edge of the world. Three-D CAD
prDgrams let architects and product
designers "build" prototypes with-
out cutting wod or metal. Medical
imaging devices let medical techni-
cians and researchers non-intru-
sively create images of body parts.
Serious and popular composers
use synthesizers to create new mu-
sical forms.
Computer technology has pene-
trated many disciplines, but it still
has a long way to go. Take video
editing for one. The traditional meth-
od for editing videotape and film is
to do a lot of physical fast-forward*
ing and rewinding. The efficient way
to do the job is via random access,
instantly jumping from any frame to
any other Due to the immense stor-
age required for video infonmation,
effective random access com-
pletely dwarfs the storage and bus-
bandwidth capabilities of today's
most powerful personal computers
and low- cos I networks.
Multimedia
This is where Type-3 vision
comes in. That vision centers
around a topic of grwrng public in-
terest: multimedia. Don't be misled
by popular computer, video, and
games magazines. Multimedia is
not just putting a sound board in a
PC, or adding a CD-ROM drive to a
Nintendo. The real pnDmise behind
multimedia is twofold: 1> To bring the
whole wodd into that virtual image
behind the CRT. and 2) To connect
your virtual image to mine and ev-
eryone else's.
The requirements for rich multi*
media are simple: 16-bit audio, full-
screen 30-frame-per-second video.
24-bit Cphotographic-qualrty) imag-
ing, fast access to lots of textual and
numeric data — all of which must be
available on-demand, syn-
chronously, instantaneously, at any
time, and (eventually) anywhere in
the world.
It would take a powerful main-
frame to provide that kind of ca-
pability today. On the other hand, a
run-of-the-mill 486 today exceeds
the computational power of a main-
frame of a decade ago. Assume
then that within the next decade,
^'computers" that meet those re-
quirements become available.
Those ^'computers' will have built-in
general-purpose digital signal pro-
cessors (DSP s) for compressing
and decompressing audio and video
data, and for doing fax and modem
chores as well. Semiconductor
memory will be measured in the
gigabytes, and permanent storage
will be measured in the terabytes
(on personal computers: main-
frames will have even morel Optical
storage may finally, after decades of
promise, become cost effective.
Tomorrow s computers will have
built-in connectivity to office sys-
tems, commercial databases, enter-
tainment banks, and interactive
educational courseware. Transmis-
sion speeds of these new networks c?
will make Ethernet and Token Ring ^
look like box turtles. 1^
Those systems will have built-in Z.
docking technology (both hardware ^
and software) for portable notepad/ Jji
planner systems based on todays S
fledgling pen-input technology. They B
will have lightweight, flat, high-reso- ^
lution. true-color displays — and z
printers — and will accept keyboard i
and pen input rndiscriminately. They
will communicate via a universal dig- 97
RG. 1— COLORADO'S JUMBO 250 packs 250 megabytes of data on a 520 tape car
tridge In less than two hours.
ital communications system that will
probably come about as some sort
oF joint venture between AT&T the
cable TV companies, the indepen-
dent networks CCNN. FNN, Fox),
media giants like Time-V^mer. and
major computer companies.
There will be gobs and gobs of
data f lowmg around, and lots of con-
fusion about who owns rights to
what. New kinds of copyright issues
will keep lawyers busy for the next
century. Students and researchers
will have unprecedented oppor-
tunities to cheat. Illegal data tapping
and decoding Cakin to today's cable
TV descramblers) will piwide a data
underground and new forms of law
enforcement (the Data Police),
That technology will not replace
todays TV, VCR. stereo system,
video game. fax. telephone* or com-
puter. However, those technologies
will come to be seen as modular,
interoperable pieces of a larger sys-
tem in which all the pieces can plug
and play — for those who want to.
From this perspective, multi-
media begins to look like everything
connected with computers, con-
sumer electronics, and entertain-
ment. Grandiose? Maybe. But ask
yourself why IBM is contemplating a
half-billion dollar deal with Time-
V\femer why IBM and AT&T are both
working like crazy to get fiber-optic
data rates to work over copper cab-
ling, and why Apple is partnering
with Sharp and Microsoft with Sony.
Personal computers revolu-
tionized typing, accounting, and
publishing in the 80s. The 90 s will
see even more radical and pervasive
changes.
That s the vision. Question: How
will you participate?
Product watch
For years the phrase "reasonably
priced tape backup" was a contra-
diction in terms, but that is no longer
the case. Figure 1 shows one of the
best deals around: the Jumbo 250
from Colorado Memory Systems.
It s a high-quality 250-megabyte
QlC-80 tape drive that can fit in a
3.5 inch or 5.25 inch bay, and it runs
off a standard flopf^-disk controller.
The Jumbo 250 includes a spe-
cial cable adapter that runs from the
drive to the floppy contnoiler; the
cable from the floppy dri\i^Cs) plugs
into the Jumbo's cable. Other than
mounting the drive and copying
software to your hard disk, that's
the extent of installation.
Backup software included with
the drive runs in both menu-driven
and command-line modes: the latter
allows unattended backup via
scheduled batch files. If hard-disk
capacity exceeds that of a tape, the
software will store additional data
on additional tapes. In addition, the
software has several options, in-
cluding password protection, the
ability to back up and restore Novell
NetWare bindery (user access
rights) files, and several types of
software- based data compression.
Using compression is faster than
not using it; I have no trouble back-
ing up about MO megabytes of data
on a single tape in less than an hour.
You can use the menu-driven
mode to create a tag list, or list of
files to back up, and then use the
command-line mode to back up the
files on the list. One nice feature is
its ability to append multiple backup
volumes to the same tape, which
gives you the ability to perform daily
backups simply and quickly. My
main complaint with the softwrare is
that it forces you to restore files to
their original locations. Sometimes,
especially in a networked environ-
ment, it s helpful to be able to re-
store files elsewhere.
Many installation options are
available, including a case for exter-
nal mounting, numenDus special ca-
ble and connector arrangements for
special PC's (such as PS/2's). and
several dedicated tape-controller
boards that provide increased
speed and hardv^/are data compres
sion. Colorado also sells softwan
to control the drive under severa
varieties of Unix (SCO, Interactive
ATSiT. and Intel).
The drive includes a one-year war
ranty, toll-free technical support
and access to a BBS. If you shof
around, you can pick one up foi
$250 mail order. By way of com
parison. just a few years ago m)
trusty 80-megabyte Irwin backup
unit cost thr^e or four times that
amount. For small offices and Win
dows pov^r users, this is a must
have (tern.
For morB power and flexibility in
tape backup software, check out
Sytos Plus. It has several nice fea-
tures, including the ability to work
writh multiple devices, including the
Colorado, numerous digital audio
tape (DAT) and 8mm Formats ^ IBM s
optical read/write disk, and hard
and floppy disks; others are being
added all the time.
Sytos also supports OS/2,
whereas Colorado does not (yet),
Sytos is routinely bundled with nu-
merous high-capacity tape drives:
the company claims more than a
million users.
Probably the nicest feature is
Sytos' more i ntegrated way of c reat-
ing backup sets. Whereas Colora-
do's TAPE, EXE forces you to create
tag lists and then manually create
batch files with numerous param-
eters. Sytos allows you (in the menu
mode) to create "procedures" con-
taining both tag list and configura-
tion options, and then run various
procedures from the command line.
Sytos also has more extensive
icumenlation lhan Coiorado. It
wrs different kinds of backups,
jd methods for creating backup
:hedules.
Sytos will allow you to restore
es from tape lo new locations with
jw names; the only feature it lacks
nd that Colorado supplies) is a
iuge that indicates pnDgress in for-
attmg a tape.
ews bits
What s larger than a calculator
id smaller than a notebook PC?
etter yet. what s the size and
eight of a paperback book, has a
2-bit RISC processor, a multitask*
g. object-oriented operating sys-
;m, and a 6- x 3-inch LCD screen
jr pen input and visual display?
asy: Apple s Newton, the first
andheld device for jotting, sketch-
g. scribbling, figuring, doodling,
laking lists, and subsequently
io\/ing that data to a larger com put-
r or another user via fax. modem,
r network. Initial specs include
ash EPROM, 1 to 20 megabytes of
AM. PCMCIA expansion cards,
ound output, an infrared data link
D Other Newtons and desktop
Macintoshes, and wired links to
oth Macs and PC's. In addition to
"le text and graphics doodle pad.
Jewton will have an address book,
cheduler. and an intelligent as-
istant that will understand and act
*n commands like "fax this story to
irian/' Newton is scheduled for re-
sase around January of 93. and re-
lortedly will cost $500-$1000.
here are also rumors of another
^pple-developed handheld, this one
;alled Sweet Pea. with CD-ROM
ind the ability to play QuickTime
icripts. It sounds a lot like the de-
vice Microsoft is developing with
5ony
IBM has publicly demonstrated
"DDI running on copper shielded
wisted pair CSTP) cabling, thus pav-
ng the way for a potential ten*fold
ncrease in bandwidth to desktop
computers — and other devices.
Niot to be outdone. AT&T Paradyne
las announced a similar tech-
nology, with claims that it could spur
:he nascent multimedia industry by
delivering on-demand and interac*
tive video services.
Nintendo and Sega are going at it
neck and neck, and in the process.
PRODUCTS DISCUSSED
# Jumbo 250, Colorado Memory
Systems, 800 South Taft Ave,.
Coveland. CO 80537. (303)
669-8000,
• Sytos Plus, Sytron Corporation.
124 Panders Road, RO. Box 5025.
Westboro, MA 01581-5025. (508)
898-0100.
taking a pot-shot at the computer
industry, Sega plans to introduce,
two places by Thanksgtving a $300
CD-based game that delivers quali-
ty audio and live-action video: Nin*
tendo plans to introduce a simJIar
$200 unit early next year Sega is
working with Sony to produce
games related to movies, e.g..
Spielbergs Jumssic Park. Early re-
ports indicate that Sega's device
will include only half-speed, quarter-
screen animation, whereas the Nin-
tendo unit will do a full 30 frames
per second. n-E
Try the
bulletin board
system
(RE-BBS)
516-293-2283
The more you use it the more
useful it becomes.
We support 120D and 2400 baud
operalion.
Parameters: 8N1 (8 data tiits, no
parity, 1 stop bit) or 7E1 (7 data
bits, even parity, 1 stop bit).
Add yourself Id our user fites lo
increase your access.
Commtinicate with other B-E
readers.
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the SYSOR
RE-BBS
516-293-2283
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M3croviston,.now you see It,
now you don't.
Macrovision Kit S29,0i
tncnjd« ail tri« ong^ Psfo & EtCM. Dnii
SuK^CTKnad PC Boarc Onginatiy Pi^ksnad m
Call Toll Free 1-800-886-8699
Visa, MasterCard or COD
Northeast Electronics, Inc.
PO Box 3310
N. Attleboro, Ma. 02761
CIRCLE 186 ON FREE INFORMATION CARD
BUYER'S IVIART
FOR SALE
A8LE Stealth: protect yourself frorri de-
ramblor detection and slop Iho ''bullet Preset'
Sted. only S24,99, S4.00 S&H. BALDWIN
LiCTBONICS, Sox 9291, Baillmore, MD
222-029t.
CABLE TV coovertefs: JenoW, Oak. Sdentrfic
Atlanbc. Zenith many others. "New MTS" steroo
add-on; mute & volume. Idea! tor 400 and 450
owners! 1 (800) 826*7623, Amex. Visa. WC ac-
cepted. B & e INC.» 4030 Beau-D-Rue Drive,
Eagan, MN 55122.
CLASSiREO AO ORDiB fORU
to run your mm tttMitM sd. put an« wqrd on tac^i of tn« Una b^om tnd >«nd tnia twm Atoog wrftti dw^ ia:
Electronics Now Classified Ads. 500-B Bi-County Boulevard. PamimgdaJe. NY 11735
PLEASE INDICATE In which category of classified adveriisJog you wish your ad to appear. For
special headings, there a surcharge of $25.00.
( ) PEans Kits ( ] Business O^rtunttjes ( ) for Sale
) Educations Inslruaion ( ) Wanted ( ) Satellite Televtsion
Special Category: $25.00
PLEASE PRINT EACH WORD SEPARATELY, IN BLOCK LETTERS.
(No refunds Or credits for typesettirhg errors can be made unless you clearly print or type your
copy.) Rales indicated are for standard style classified ads only See below for additional
cha/Qes for special ads Minimum: 15 words^
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15 ($46.50)
16(549,60)
17(S52.70J
18 ($55.80)
19 ($58.90)
20 (S62.00)
21 (S65.10)
22 ($68,20)
23 ($71.30)
24 ($74.40)
25 (S77.S0)
26 ( SdO 60)
27iS83,70)
28 ($86.80)
29 (589,90)
30 ($93.00)
31 ($%J0)
32 ($99,20)
33 ($102.30)
34 ($105.40)
35 (S1 08.50)
Wa accept Ma$lf;rCard and Vi&a for paymGnt ol orders. II you wish to use your Credit card to pay lor your ad till
in the IdJowtng addiliorLal intormaijoa (Sorry, no t&lephone orders can be accepted ):
CardhMitiet
ExpirabonDtfe
Ploase PrrrM Name
Signature
IF YOU use A BOX. NUMSEft YOU MUST tNCLUDE YOUR PERMANENT ADDRESS AND PHOME
NUMBER FOR OUH FILES. AOS SyBMHTED WTTHOiJT THIS INFORMATtON WILL NOT BE ACCEPTHa
CLASSIFIED COMMERCIAL RATE: (lor frrms t)r mdividuats ortering commorcral pfcxtucis or servtcos}
S3 to per word pfep(i d (no c^afg<^ tor zip code) MINIMUM ts WORDS^ 5% d^scoyni Tor ^me ad in 6
issues: 10% discount lor samo ad m 12 issues within ona year: if prepaid. NON-COMMERCIAL RATE: (lar
Ifdividuals who want la buy or seSl a personal item) S2 50 per word, prepaid no mminnum ONLY FIRST
WORD AND NAME set if^ t>o3d caps al noexuachargo AddJiion^l &ald facv (nat a-.^iuaple as ait caps) 5Sc
per word addJtbnal. EnVo ad m boldt«#, S370 per word. TINT SCREEN BEHIND ENTIRE AD: %2.&5 per
word. TiNt SCREEN BEHIND ENflflE AO PLUS ALL BOLD FACE AD: $^ 50 p*?r word EXPANDED
TYPE AD: S4.70 per wofd p«p**d. Ertifaad m bdd^ate. S5 60 per A^rC TINT SCREEN BEHIND ENTIRE
EXPANDED TYPE AD: SS 90 per wofd TINT SCREEN BEHIND EHTtRE EXPANDED TYPE AD PUIS
ALL BOLD FACE AD: S6 80 per wrd DISPLAY ADS: ^ ■ 2 S410 00, 2^ - 2' .-—5820 00. 3' -
2' i'— St 230 00 Ger>eTal Informatlor*; FiTK:i;ercy rait?s arK3 prcpayTnens c scounisj a\'aiiab'e ALL
COPY SUBJECTTO PUBLISHERS APPROVAL ADVERTISEMENTS USING P.O. SOX ADDRESS WlU
NOT BE ACCEPTED UNTIL ADVERTISER SUPPUES PUBLISHER WITH PERMANENT ADDRESS
AND PHONE NUMBER. Copy To tjo in our har>dii on Iho 5(h of I he I hud rnontii preceding tno daio of ihQ
tssue. (i e„ Aug issue copy musi be received Oy May 5Tii) When norma! cJosirwi da'D (alls on Sntiurday,
Sunday or Holiday, jssue closes on preceding working day. Send lor Ihe daEiSiliod Bfoctiufo C'rcle Number
49 ofi me Free tntormabor^ Card.
TUBES, new. op to 90*^ oft, SASE. KIHBY, 236
West Carrrief Drive, Carmel. IN 46032.
TU notch f< Hers H phono recording equipnaeni, bro*
diure $im MICRO THInc. Box 63 6025, Mar-
gate. FL 330G3 (305) 752-9202.
SPEAKER repair A I makes — models. Sleroo &
pfofessicnaJ Kits available Rofoarrung StB 00.
ATLANTA AUDIO LABS. 1 (800) 56B-6971.
ENGINEERING software and hardware. PC/
MSDOS. Circuit design and drav/ing, PCS
layout. FFT analysis, mattiemattcs, circuit
analysis, etc. Data acquisition, generation,
I/O PCB's, elc. Call or write for free catalog.
(614) 4910832, BSOFT SOFTWARE,
INC., 444 Colton Rd.. Columbus. OH
43207,
CABLE TV Equipment. Mosi lype available.
SpeciaJ; Oak M3SB $39 9 S. No catalog. COD or*
dors onty. 1 (BOO) 822-9955.
CABLE TV ^
***** SW?mNG *****
JERROLD, HAMUN, ClAK
AND QTH£R FAMCHJS MANtlMCTURERS
• LOgi/EST RflAM^/WHOiBALE PHICE5 M US
* ALL iMJOU Cfff IXT CAHDS ACCEPTED
FOfl AIL INFORMATION
PACIFIC CABLE CO.. INC.
7325V; Reseda Blvd.. Depl.211B
Resed.l, CA 91335
eOC52'Basic microcontjolfef boafd. Bas^ iriior^
pmiet 32K RAM. 16K Eprom. Eprom programmer,
RS232. expansion connectof Bare board wilh
rrkanual. schematics S32 95 SOCSS-Basfc micro-
processor chip S25 95 Assembled and tested
S124,95. PR0LOG1C DESIGNS. PO Box 19026,
BallirnQre. MD 2t204.
JERROLD, Tooom and Zenith ''test" chips.
Fully activates unit. S50.0D. Cable de*
scramblers from $40.00^ Orders 1 ($00)
4S2-7D$0. Infonnation <3t0) S67^00ei.
TOCOM-Jerrold Impulse-Scientific Atranla
Converters, two year warranties, afso tesl mod*
ules for your converters Contact NATIONAL CA^
BLE, (219) 935^12B full detajis.
Qyalitv Microwave TV Antennas
WIREUSS CAHE - im ■ MMDS - Aflulcv TV
LfiBi lip Ctv SMlf*»« IpwHi U » L? fikx.
- 5S-Channfli Dis»i System $1999S
- 36-Qiann«l Disii Sv3i»m
« 20-aimriilDi^Syaa*n Sl24fl6
PHILOPS TECH ELECTRONICS
EhtftSyitPm psi Boi SSSa . SraUiilaie, AI 15252
tJFmME 1602) 9477700 i U QO tt HI pNM* ttUn \
PROTECT yourself and equipment from etectjica}
shocks. Conriplete unit S9B.95 SAFETY-UN-
LIMITED. ^743 Baldwin Road, Yorktown, NY
10598. SiH S5.0Q.
SCIENTIFtC Atlanta 8500 series as low as
$f 29.00, Slarcom 6 as low as $149.00. All makes
in slock. SAC, 1 (800} 622'3799.
I
m
8
3
tot
I
i
z
8
I
102
CB RADIO OWNERS!
We specialize in a wade variety of technical
information, parts and services for CB radios,
lO-Weler and FM convefs.'or^ kits, repair books,
plans, high-performance accessories. Thousarvds
of satisfied custofners since 1976' Catalog 52.
CBC INTERNATIONAL
P.O. BOX 31 SCORE, PHOENIX, AZ 85046
TEfi t^Attfft for testing ur>it5 in full survive mode,
Staroom VII. $40.00; Slarcom VI, S30,00: Stor-
COm DPBB, $50.00, Pioneen S75 OCj Toccm VIP
5503^5507. $25 00; S.A. call; Zemlh, S2 5,00. N.E,
ENGtNEERING, iB\7) 770-3830.
CABl-£ test chips A B550. S^A B500 — 310.
311. 320, 32i (specify) — $33,95 S-A 8580^
— 569 95. Tocom 5503^)7 VIP — S33.95, Staf-
com 6 — $33.95, Slarcom 7 — $4 9. 95. TBIE-
CODEt PQ Box 6426-RE. Yuma, AZ S53&6-6426
OSCILLOSCOPE 50 MHz, Hewlett Packard, sol-
id state calibrated, manual S290.00. 1 (800)
835-6335 X-159.
SECRET cable descramblers! Build your own
tie scrambler for less than Sl2 00 in se'^ oa*y
Steps, Cortiptete instructions SiO 00. Radio
ShacM parts list ard trm descrambJmq meinods
lhat CQS\ nothing to try included. HARRYWHITE,
PQ Box 17900. Baytown, TX 77520.
WIRELESS CABLE RECEIVERS 1.9 TO 2,7 GHi
m IQI #KSZZ CATUflG Ok mm
mimi, *L mm jueq dtker f m
CABLE converters, retail at wholesale prices.
Overstock reduction sale. Eicample RTC-SS
$79,00 ea. Star com 6 as law as SI 49 .00, Aii
makes available. MT. HOOD ELECTRONICS
(206) 260-0107.
PREVEMT de scrambler damage. Don't bite tlie
bulioll Snooper stopper data btocker $29.95, VJO-
EO CONNECTIONS. 1 (BOO) 933-3038.
STARCOM 6. Tocorti. Dai^. Pioneer, Soenttfic At-
lanta, 2en4h. as Sow as S39.00, KABLE KON-
NECnON (702) 433-0959,
RECEIVING TUBES
OVER 3000 nPES W STQCKi
Also hard'tD'tind transJormers. capict-
tDrs i/id pans for tube «Quip mem.
S^nd $2. 00 for our 32 page ca(^k)Q.
ANTIQUE ELECTRONIC SUPPLY
6?21 S, Maple Ave,*Tempe, AZ a5233'602'e20-5411
CABLE TV. Zeniiti. Jorrofd, Oak. ScienUnc Alian-
la. Hamlin, Tocom. whofesaJo to all ULTIMATE
CABLE PRODUCTS. (702 J $46-6952
PCB: Printed orcu:! board an work made to your
Specifications plotted on Uansparen^. Multr layer
and surface component capatrie. Orcul t>oard
production available, free estimate send sche-
matic to NEGRON ENGINEEFIING, 159 Garfield
Place, Brooklyn, NY 11215. Fax (718) 768-4028.
CABLE descramblefsl Absolutely the lowest
prices ! All maiOf brarxJs. Nobody beaLsourpnces'
CABLE PRICE CLUB, 1 {800) 377 9742,
NO B00# — no catalog — r>o tKiii! Just Lhe t>est
prices on Zenith ar>d SAdosaamblors, Afso avail-
able — lum-on kits, can (305; 25-4378
PRINTED circuit boards. Plated, ciched and ma-
chined to your desiqn. Small runs OK. Call or
write: SHORE PRINTED CIRCUITS, 36 Faifvi(>w
Awonuo. Uttio Sliver, NJ 07739, (908) 747-6300, 1
(800) 752-1574. Fax (908) 747-6301.
POWEH inverter 100% portable 1 15V AC 12V DC
100W from built in rechafoable battery 13 lbs
SI 85.00 plus S^O OO S H. Circuit and brochure
only $10,00 {Refundable when orderirrg inverter).
PROGRESS TECH, 13222 Carolyn St.. CerritOS.
CA 90701.
PC boards: Professional quality. 30 ctay guarmrv-
tec. beat ali prices A & D. PO Bon 31 1. Auburn, Ml
-taSll. (517) 662-6633.
PLATED thru t>oie printed circuits. $25.00 mini*
mum Fast turnaround. For more information call
AP CIRCUITS. (403} 250^3406 or BBS (403)
291-9342 {8.n.1),
FREE CATALOG
FAMOUS "FIRESTIK^^ BRAKQ CB ANTENNAS
AND ACCESSORIES. QUALITY PRODUCTS
FDH THE SERIOUS CB^er. SINCE 1962
FIRESTIK ANTENNA COMPANY
2614 EAST ADAMS
PHOENIX, ARIZONA 85034
TUBESr "(^st/ "latest/ Parts and scnemaiics
SASE for lists, STEIKMET2, 7519 Maplewood
Ave.. R.E-, Hammond, IN 46324.
RESTRICTED technical information: Electronic
surveiliance. schematics, locksmithing, covert
sciences, hacking^ etc Huge selection. Free
brochures. MENTOR-Z. Drawer 1549. Asbury
Pafk, NJ 07712
PLANS AND KITS
FASCINATING electronic devices! Dazers!
Lasers! Transmitters' Detectors! Free energy!
Tesia! Kits' assembled! Catalog S4.00 (refunda'
ble) QUANTUM RESEARCtT, MBX^n Ave .
Edmonlot^, AB- T5T 2S1
H O B B b ro ad casti ng^ HA M ' 06 / stf rvei llan c e
iranseutters. amp'ifiers. cabfe TV sdefce. bugs,
other great proiecis! Cataloo St .00. PAN AXIS,
Box 130-F9. Paradise, CA 95967,
REMOTE CONTROL KEYCHAIN
fUijr iftien-isfed mcliKfing p?#n»
to txjfc'd your own *uto BJarrn
D Add * 7 ohippina
5@S19.95, 10@$14,9$
V isilOCl Inc. O^x 1 4 1 56, Fremont, Ca. 94539
{510)651-1425 : Fax (510) 651-8454
D ESC RAMBLER kits, Gomptete cabte kitS44.95,
Complete satellite kit $49,95 Add S5.00 shipping.
Free brochure No New York sates, SUMMIT RE.
Box 489, Bronx, NY 10465,
VIDEOCIPHER I i ' sal el f i te, sea n ne r; ca ble/am a-
teur/cellular.'reparr manuals^ modification tjooks,
sofiwaie. Catalog — S3. 00. TELECODE, PO Box
6426 FIE, Yuma. AZ 85366-G426.
KENWOOD & ICOM service bulletins. ITS ^
pages co-.t?rirkg all nnoc:ufns, t?tc. Send S3 00 fo^
catalog, HOME VU mIrcHANDISE. Box 3B371.
Detrotr, Ml 48238,
ROBOTlCSt Bui Id Hi* Yourself! Hobby, personal, &
service fobot types — designs, parts and plans.
Catalog S1,0(5. directory SlO OO. IPC, Suite
251 BE. 1019-A Old Monrovia Rd . Hunts ville. AL
35806,
REMOVE
LEAD
VOCALS
From
ne«^ S CO «
513-444
Bui Id this kit whic;!] mmoww t
vocals rrom ttvuiajd ftefvti reco
CD tap« or FM broadcasts £
als^r^g tha t^tckg round mu
tise witli any homo campofi
ttereo Additiof^aJ kit adds revert
your voice. Eh*n mins il rtitft mu
Pre-Bs»iiibliMd bo^jrds Ki
5. Ca;5 of WTttfi tOf ffo« til
Weeder Tnfanologles, t4
LJAd£«y Rd , m. Ora^. Ohio 45!!
SURVEILLANCE Iransmttter kits lune from E
to 305 MHz. Mains powered duplex, telephoni
room, combinalron teleptrone room Catalog wil
Popular Communications, Popular ciei
trontcs and Rad Jo-Electronics bo^k review i
'"Electronic Eavesdropping Equipment Di
sign/' S2 00 SHEFFiELO ELECTBONiCS, R
B-Dit 37778M:. Chicago. IL 60637-77S5
CELLULAR tiackors bible. Theory — hacks -
modilicaiions — S53,95, TELECODE, PO Bo
6426-RE, Yuma, A2 85366 6426.
SATELLITE TV
FREE catalog — Lowest prices wcrtdAide. SK^
VISION^ 1012 Frontier Fergus Falls. MN 56537.
(800) 334-6455. See tuli page ad the Shoppe
section.
SATELLITE TV — Do it yourself — major brand
discounted, we'll beat everyone^ price. Cb\\ LAR
RY (609) 596-0556.
CABLE TV
DESCRAMBLER LIQUIDATION!
FREE CATALOGf
Hamtln Combos $44, Osk M35B S60 (min. 5K
WEST COAST ELECTRONICS
For Information: 818-709-1758
Catalogs & Orders: 800-623*9856
BUSINESS OPPORTUNITIES
YOUR own radio Station! Licensed unlicensed
AM. FM. TV, cable Infonnatfon S1 00. BROAD-
CASTtNG, Box 130-F9. Paradtse. CA9S967,
LET the government finance your small txjsjness.
Grants loans 10 5500,000. Free recorded mes-
sage: (707) 449-6600. (KSl)
MAKE S75 ,000.00 10 $250,000 00 yearly or mofO
I i Xing IBM color monitors. No investmerrt, start
doing it from your home (a telephor^e required).
Information, USA, Canada 52 00 cash for bro-
chure, other coi! nines Si 0 00 US furids RAN-
DALL DISPLAY, Box 2168-R, Van Nuys. CA
91404 USA, FAX (618) 990-7603
CONTINGENCY paieni licensir^a No fees any-
time. Three decades expenenceilaw, technology,
negollntlons. PROPAT INTERNATIONAL COR-
PORATION, 441 Summer Street. Stamford, CT
06901 (2031 325-3344.
BEST BY MAIL
Rat*«: Writ* N4tk>nAL Box S. S«r«icU, FL 34230
OF INTEREST TO ALL
RETIRE EARLY 1 '900-770-3345 CODE AS 51 SO Mention
Coda m
BURGLAR ALARMSr WHOLESALE SfindS5.00 For ArrraZ'
ino CatsEoQufj GEobal Bcrcuitty, 672 Oldmlll Road, SuHq
3a. QPTr^l M.llery.ino. -MP gfl08
BOOKS ' CATALOGS ■ MAOAZINES
a UHUmiED 2nd CREDiT FiLE!
CALL 614-239-8284, EjtL 1
WRITE: 4lh LIMITED* BOX 3243M1E-COL ,0H
Start a money-making career in
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's newly expanded training c ov-
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rv\ iifvrr !>rrn a \t*^l\vr limo In pri
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idurl tiiiinv:it]iMi niriin^ iirsv opjMirtu-
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b(iM- opgiiirtiinilir> |>y pviti|;yfiu tlit-
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er offered!
u titarl vvitli Ivssirii.s tliut ^ivi' y*ni a
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leo/nufiiii iMjiJ] pRiriit .
Tlivn you IhiIIiI nn lliiit fniiniialifm
you r\|iliirt' thr lii^h If^rhiitilopy uf tlip-
rnnlrirt^, flD^v ami diininl auiliti liijn*
lyers, lulvam'nl T\ systriUfi, iniJkli* TV.
crtijniiri'»'>c>r>.
Hrsl of all, yijnVi* |irt>
ml fur iht- Irrliuolo^y nf
lay ami IdtTUirrow with
nd*i-*in traifi-
e ytm invahi-
Ir iirurtiriil
j)t*rii'rirt^
State-of^the^rt equipment
included in your training makes
theory come to life
Oul) MU '/iw^ ytm mucfi n-^ubiAnrld
i-i[iii]uui-uL ... n\\ yiMir>{ lo iraitt with aud
krt'|il Cn-l liaiitis-iui ox|>(*rirurr as yiiu
wiirii with ii riim|ilr'tr. h]|:ti-ti'rh hmnr
rultTtaiumriil vysirm: a l-i*' rfih>r T\
Hilh rritifitr, a pru^raninialilr \CR, aud
an inti*!*rati*tl n^miilf-ronmilh"*! auilio
r^yj^h'^iti inrluiliri^ A^1/FM tiiiirr* llHl \^alt
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NRi builds it in
Villi tiiM'd no prf^s ifMJs i^xpiTit^urr in rlrc*-
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yim arrnmnlale thi; kuowlrd^i- iiiul praoti-
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Yon Iram at yonr own \mrv and on
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FREE catalog tells more
If tbi- 1 iinptio mi-s-i^inp, writr lo
NRI SrtoioU, ^Irdraw-Hill Ctinlinuinp
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SEND TODAY FOR FREE NRI CATALOG
99^9M Sr-liiiiilM
MfGniw-lliU ( jMiiiniiin^ I'Miu jUiim rr-iio^r
\m\ Gitiorclii iit Avi-nii«% WaNhtopjli.n. IK! 2O0U8
irk oni' fKKK cataIo|z only
Irsnrrr 1.'^»|nm lljililir*
iijii|iriiVt-tl iiiulrr fpl Kilt
D TA'A'iflrfi/Aodit* 5^r>irin|r
O \1irrikrfim|iiM<*r Server in|;
Q Otmptiter I'riv^amminfE
O Tf-ltH-omnuinirnHnn^
Q |*'H and hihd^idtk
frfim IX: ru 20 xMH?. The
' ' i tsdUtHcopc ojmcs
:Lis-i. I^mff ODtdt OfCfttHUl
4Ad w->inf ifiignnL It^
Ii^bnv?^f lod pamblr wirh
3.5 Digit MitliinmcT
^ uch/dmdl .™__^59.95
35 OigiT .Mdiinviet w/frfqwrny
^ tapidtaEuc ...,...........,$74^95
4.S Dipt ^/frnjiKtirr 5f cafiMiunce
4 ib«hciid i^LjJi,.. S99.95
Joitteco IC Test Clip Series
• Test Clips are desigiicd for remporafy
conr^cciioat la Dl? components
* Heavy -du(}' spring loaded hitige provides
poll rive contact
Part No. Docriptkm £
JTCl 6 1 6^pin f for 8. H & IQ)
JTC20 lO-pin ifor 18 & 20-pin iaj.«.««<
JTC24 24-pin . *
JTC28 28-pin 1
JTC40 40-pm
fer your programnilng needs
rmNt>. Cria J^oJ^ I
EPROMs
I
i
UJ
104
Addltionol GoldStar
Oscllloscopof
GS904RD ^OMhz 2ch4nnd
oscilloscope S799,95
GSSlOO |0OX1hz3ciLinncl
mcdlmcope 1349.95
CuiJ for addititinai Gobistar
iett equipmettt
J AMECO
COUFUTER PROWCTB
24 Hour l oll-Free Order Hotline
1«800«831^«I42
GS7020 $399.95
NoHiHial and Intel
DiitabMks
PttftJVo.
Price
TMS2516,,,.,,
.«S4.25
TMS2564 ......
.....5.95
TMS2716.
— 5.95
I702A
^-.3.95
2708
..-4.95
2716 ,
3.9S
2716-1.
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pa rt No . OfKUplkl] Vlks
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Or is it?
Only you can prevent forest fitcs.
&k1 mdfgaiSast¥otcaT
HARDWARE HACKER
contfnued from page 93
Whole Earth Review. There are
bunches of independent and non-
profit inventor's organizations out
there. One I can heartily recom-
nnend is Ed Zimmer's hventor-En-
trepreneur Network. For other
regional sources, check out the
Encychpedia of Associattons that
you will probably find at your local
library.
No* 1 just do not know of anyone
anywhene who is dumb enough to
buy raw, unproven, or undeveloped
ideas. But I do know of several
someones who sometimes might
be interested in looking at tightly
targeted products if those products
are now in their pre-prnduction pro-
totype stage and currently under ac*
live end-user beta testing.
For instance, Mark Gottleib of
Design Tech International is looking
for innovative approaches to low-
end consumer electronics, es-
pecially for those items that can be
blister packed and need no con-
sumer smarts to use.
Dennis Carper of Redmond Ca-
ble is seeking tested and proven
interconnect and adaptor products
that clearly solve obvious and well-
defined problems.
John Simonton of PAIA Cand a
frequent author in Electronics
Now) sometimes seeks out items
with kit possibilities, especially if
they are related to MIDI or elec-
tronic music.
And Steve Ciarcia of his Micro
Mint is occasionally interested in
any embedded processor applica-
tions — if they are unique.
Besides my own PSFTT RoundTa-
bie on GEnie, you might also want to
check out their HOSB. short for
Home Office and Smalt Business.
I've also formed my loosely knit
Synergetics Consultants Network
that centers on our voice helpline.
Give me a call if you need mom
information.
New tech 111
From Texas Instruments, seven
pounds of revised fineardata books.
Volume I is on op-amps; volume II is
on A/D, DSR and video: and vol*
ume ill is on voltage regulators and
really oddball stuff.
A pair of very readable ne
books: The Triumphs and Trials ofi
Organ Builder, by Jerome Marl
owitz, CEO ot Allen Organ, and pul
lished by the Vox Humania Presi
Among the other things, it reveal
how trivially easy it is to have ar
technically solid and perfectly vaS
patent busted in court. Just bi
cause some epstion minus does m
happen to like you.
Plus Accidental Empires by th
pseudonym Robert X Cringle^
newly published by Addiso
Wesley. Subtitled How the toys t
Silicon Valley make all their milliom
battle foreign competition, and st
can 't get a date. This book has
double handful of very hinny oni
liners in it. But otherwise it read
like something that Cringley woul
write.
I've found very few trade joumal!
devoted to electronic servicing
One useful new one. though, i:
MSM. the Magazine of Servict
Management. The magazine puts i
big emphasis on computer service
and identification of sources fo
printer and disk-drive replacemen
parts and assemblies.
A great collection of navigatior
books. GPS (global positioning sat
el(iles) and otherwise, is offered b^
the Navtech Information Service
And a new Spread Spectrvm Seem
labor-of-love newsletter has recently
started publication.
Two firms apparently still offer tof
octave generators and other classic
electronic organ chips. The first is
Fistell Microelectronics and the
other is Keyboard Systems. The lat-
ter also builds workaround replace-
ment modules for chips that are
truly unavailable.
Turning to some of my own prod-
ucts, yet another obvious and major
product selling resource is my re-
cently improved Incredible Secret
Mon^ Machine 11. The autographed
copies are available per my n earthy
Synergetics ad.
As usual. I have gathered many of
the resources mentioned together
into the Names S Numbers or the
F^duct Marketing Resources side-
bars. Be sure to check those out
before you use our no-charge tech
helpline or call for a Free hacker se-
crets brochurB. R-E
ATV DOWNCONVERTER
continued from pnge 84
wided for you to make your
vn boards and the parts-place-
lent diagram is shown in Fig,
First instaJl resistors R1-R13,
nd R15-R17. Next, Install all
apacltors except the chip ca-
acitors and CIO. Install mixer
IL and then wind and install
Dlls LI. L2. L3, L5, L6. L7, L8.
Coils LI. L2. and L3 are three
arns each of 20 AWG tinned
ire wound around a No. 8
crew as a form (see Fig. 5) and
nen stretched to a length of 0,3
nch with the turn spacing
venly maintained. All three of
hose coils must be tapped as
hown in Fig. 5, The lead from
1 (which can be coaxial 50-
■hm line) has its center conduc-
or soldered to LI at % turn from
he grounded end. Resistor R5
5 soldered Vh turns from the
nd of L2 that connects to R6.
:7, and C8. Coil L3 is tapped at
turn from the grounded end.
Coils L6 and L7 are 8 turns
!ach of 22 AWG enamelled wire
vound on a No. 8 screw The
icrew is removed after winding
he coll. Coil L8 Is 9¥i turns of
12 AWG enamelled wire, wound
he same way as L6 and L7.
Howeven after winding, the No.
3 screw is removed and a ferrite
uning slug is screwed into the
binding as shown in Fig. 5. RF
2hoke L5 is installed as if were a
resistor.
Install 92. 93. DL D2. and
D3. Now install the chip capaci-
tors. Chip capacitors require
special Installation pro-
cedures — and they all moun t on
the solder side of the PC board.
Figure 6 shows where all of the
chip capacitors, CIO [which
well get to in a moment}, and 91
are mounted on the solder side
of the board. As for the chip ca-
pacitors, first tin the area on the
PC board where a chip is to be
installed. Then hold the chip in
place with the tip of a small
screwdriver or tweezers and
tack solder one side. After its
tacked in place, fully solder both
sides of the chip.
Now install Ql, whose long
lead is the drain. Make sure you
use a grounded iron and work
in a static-free area. TVeat QIbs
you would a delicate CMOS IC,
The tuning pK>tentiometer (R14)
can be mounted in different po-
sitions for added flexibility; It
can be mounted off the board
for remote tuning purposes.
Make sure all holes marked
**G" in Fig. 4 have jumper wires
passed through them and sol-
dered on both sides of the PC
board as shown in Fig. 7. Also,
both sides of the board must be
grounded together with copper
loll tape, also as shoWiTi in Fig. 7,
Once the tape is in place, solder
both sides.
Next make capacitor CIO,
Tkke a small square of G-IO.
0,062 material (the same as the
PC board material) and trim it
to a ^/i6-inch square. Install It on
the solder side of the board as
shown in Fig. 8, Connect coax-
ial 50-ohm cables to Jl and J2,
and DC power leads to D3 and
ground. Set trimmer capacitors
CI. C5. and C6 to about 20% of
maximum, and set C9 to about
80% of maximum. If you use
R14, it can be set halfway. lfR14
is not used, RIO should be tem-
porarily connected to a supply of
about +8 volts. Figure 9 shows
the author's prototype,
Ttme up
Timing consists of peaking
the tuned circuits for best re-
ception. Using a frequency
counter connected across R12,
adjust C9 for a nominal fre-
quency of 370 to 375 MHz. If
installed, R14 should vary that
by about :£ 15 MHz. !f R14 is not
installed, 0 to +12 volts applied
to RIO should do the same. The
oscillator might stop if less than
2 volts is applied to RIO— which
Is acceptable as long as you can
obtain a frequency range of 30
MHz.
Connect the converter to a TV
set tuned to channel 3 and to an
external antenna for ATV recep-
tion. Find a signal and peak LI.
L2, and L3 for the best picture.
You can also use an RF signal
generator tuned to 435 MHz if
no on-the-alr signal is available.
As a last resort, you can also
peak LL L2. and L3 on noise.
It is also possible to experi-
mentally peak the converter on
UHF channels 14. 15, or 16 if no
other signals are available. Set
C9 for a L.O. frequency of
around 410 to 420 MHz. Note:
This is onJy to see if everything
works if there's no other way to
obtain an ATV signal and you
have no access to a signal gener-
ator. You will later have to re-
peak the converter to 420 to 450
MHz.
If a sweep generator Is avail-
able, simply peak the converter
for a response as shown in Fig*
10. By trimming CIO {use a file
on the edge of it) you can also
experiment with the coupling
and resultant bandpass shape.
You can also do this with a cali-
brated RF signal generator and
a receiver and/or RF voltmeter
but this will take more time.
The converter should be
mounted in a weatherproof
metal box, if outdoor use is In-
tended. A metal box reduces
stray signal pickup, and also
protects the converter from
damage*
If you will be remote-tuning
the converter (as was shown in
Fig, 3), the converter should be
mounted right at the antenna
or very close to it. That permits
a short cable from Jl to the an-
tenna, reducing signal losses.
The converter can then be
mounted as far as 300 feet from
the TV monitor R-E
PRAWIIMC BOARD
continued from pBge 96
case, you should trim the level be-
cause the ctrcLitts we'll be building
expect a 1-volt signal.
The only other thing to notice
herB — ^there just isn*t much to the
circuit at all — is that the video signal ^
being fed to the base of the tran- %
sistor is related to both positive volt- |
age and ground through Rl and R2. |'
The circuit is going to run on a regu- s
fated 5-volt supply; it must be %
steady because the level of the sup- m
ply voltage is going to have an effect S
on the level of the video. Wire up the 1
circuit shown in Ftg. 4 and get the 8
video source in place. When we get o
together next time we'll start de- *
signing some kind of circuit to screw
up the signal. R-E ^og
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