digital clock antique radios

100 Pages·2017·9.39 MB·English

$1.00 AUG.1977
THE MAGAZINE FOR NEW IDEAS IN ELECT"
New From Heath
TWO COMPUTER SYSTEMS'
For The Hobbyist
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TV MODULATOR DIGITAL CLOCK
GERNSBACK
Feeds Video Signals PU[3UCA71ON Build 10 -Function Unit
To Your TV's Includes Timer And Alarm
Antenna Terminals Simultaneous Display
MAKE PICTURES TALK ANTIQUE RADIOS
How To Turn 8mm Silent Get Started Restoring
Home Movies Into Talkies And Repairing Today
.SOS:
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C IRision Systems For Your Car álovie Sound Synchronization
*
' a Tests 0 tonica ST- 3535 Tuner Hitachi SR -903 Receiver
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Micromird is an iicred:bly flexible, 32F. byte expansion boards and a mapping
complete and expandable, hardware/ option give Micromind expandable access
software, genera: purpo computer to 64 Megabytes. Utilizing softwa-e-
system. Yoi won't cutgrc.w it. cortrolled I/3 channels Microm nd's
Hardware inclt.des an 30 key, software - advanced encoding techniques bad data
definable keyboard: I/O i^terface board, iron ordinary tape recorders at 3.200
6500A -series microprocessor ipowerful bits per seccnd.
enough. for 3cvanced zo-nput`.ng), a high - P'.icromind comes to you ready -to -use,
detail graphics and rharecter display re factory assembled and filly tested. Among
processor, power supply. enclosure microcomputers, it has the largest memory
and connectionnss foe LID to 4 tape recorders v capacity anc the fastest storage. You're
plus TV or monitor. An in_erconnect bus looking at the. work of the finest display
processor on the marke-. You won't find a
microcomputer with a more powºrful CPU.
powerful assembler, a debugger, a file You won't find a zomputer with a
system, graphic routines, and peripheral ,p more flexible keyboard. You won't
handlers. We also include dynamic graphic finc anything to
games: Animated Spacewar and Life. 1_ . touch it at
ECD's standard Micromind µM-65 0° s987.54.
supplies 8K bytes of memory. Additional 1 s
r11r - .
G'y
So, quit the kluge scere and key into
Micromind. You'll be a mein frame per-
forrrer, with all the comforts of hcme.
permits 15 additional microprocessors, We're not foc ling ...this is the cat's µ!
parallel processing and vastly increased
computing power. EZD CO FS'
.
System software-includ:ng ECD's own 196 Broadway, Cambridge, Mass. 02139
notsoBASIC h gh level language, on (6170 661-44990
ECD
advanced error -correcting tape cassettes
-provides e word processing editorr, a
1
Name
Address
City/State Zip
Fantastic! Check enclosed: $987.54. Shipping paid by ECD
BankAmericard Master Charge Mass. Resident add 5% Sales Tax
# Expiration Date
Signature
Send me your brochure.
rJ
Actual unretouched photographs.
CIRCLE 51 ON FREE INFORMATION CARD
We've just made the impossible...
a professional digit DMM Kit for less than $60.
31/2
VE1A
p
sabtronics
MODEL 2000
illRANGE
FUNCTION ' MAX
0On« 10V 1K V 2A-11( V
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POWER AC VOLI T AMI OHM 1Mfl 10K 100fl 10
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COMMON
The Sabtronics Model 2000 is an impossible $59.95!
And that price still includes phenomenal accuracy, range
and professional features.
This all -new bench/portable multimeter, reading to
±1999, has a basic accuracy of 0.1% ± 1 digit, and has
five functions giving 28 ranges, 100% overrange and
overload protection. So you know it's no toy!
Besides, what toys are as automatic as the 2000? With
automatic over range indication, automatic polarity,
even automatic zeroing!
Yet the 2000 is easy to assemble. We send you all the
parts you need, even the high -impact case. We also send
you clear, step-by-step assembly instructions.
So you end up with a professional quality 31/2 digit
DMM for the unheard-of price of less than $60. From
Sabtronics, specialists in digital technology. And
manufacturers of the impossible.
Order yours today!
sabtronics
Made in U.S.A.
INTERNATIONAL IINNCC..
P.O. Box 64683 Dallas, Texas 75206 [phone]
GUARANTEE:
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Our guarantee to you; examine the 2000 RE -8
DMM kit for 10 days. If you're not satisfied, To: Sabtronlcs International, Inc.
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return it unassembled for a full refund of
purchase price. Please send me Sabtronics Model 2000 DMM kit(s) at
$59.95 each. subtotal
SPECIFICATIONS:
Shipping and Handling, $5.00 per unir subtotal
DC volts in 5 ranges: 100µV to 1000V.
AC volts in 5 ranges: 100µV to 1000V. Texas Resicents Add Sales Tax
DC current in 6 ranges: 10nA to 2A. TOTAL enclosed
AC current in 6 ranges: 10nA to 2A.
Name
Resistance in 6 ranges: 112 to 20Mí2
Input Impedance: 10Mí2
Street Address
Display: 9mm (.36") LED.
Power requirements: 4.5 VDC to 6.5 VDC
City
(4 "C" cells *hot included).
Size: 8"W x 6.5"D x 3.0"H. State Zip
(203W x 165D x 76H mm).
'USA only. Canada, $6.50. All Other Countries, $10.00.
CIRCLE 73 ON FREE INFORMATION CARD
Xcelite
NOW PRODUCED IN NEW, LARGE FACILITY
every electronic hand tool
you'll ever need
The new, ultra -modern Xcelite manufacturing plant ... the most
advanced in the world for producing top quality forged tools ...
is now turning them out in record numbers to meet the ever-
growing demand for the world's finest family of electronic hand
tools. And at no-nonsense, competitive prices.
Employing the latest in manufacturing technology and quality
controls, with every step in the production process under one roof,
this new, large facility is continuing evidence that Xcelite ... the
pioneer that brought you so many innovations in electronic hand tool design ... is also
the front-runner in production innovations. a
Whatever your needs for electronic product assembly, service, or maintenance, the
Xcelite line, finest and most diverse available anywhere, offers your best answers ...
perfectly aligned, hand -honed pliers and cutters, precision -machined screwdrivers and
nutdrivers, exclusive thin -pattern adjustable wrenches, plus dozens of related tools
and kits you might require.
It was no accident that Xcelite long ago earned ... and still holds ... "Preferred Status"
among electronics professionals. So keep expecting leadership from Xcelite ... and í
see your distributor for today's most wanted hand tools made by tomorrow's
production methods.
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Weller-Xcelite Electronics Division
Cooper Group
COOPER
INDUSTRIES P.O. Box 728, Apex, North Carolina 27502
CIRCLE 1 ON FREE INFORMATIONTChAeR D
Radio -Electronics®
THE MAGAZINE FOR NEW IDEAS IN ELECTRONICS
Electronics publishers since 1908 AUGUST 1977 Vol. 48 No. 8
BUILD ONE 33 Build Thls Video Modulator
OF THESE One -transistor device with built-in isolation switch permits ON THE COVER
direct connection of composite video signals to the antenna
terminals of your TV set. by Glen Dash Two major new computer sys-
tems are now available to the
36 10 -Function Digital Clock
Simultaneous readout of time, date, alarm. Includes built-in hobbyist. Teamed with a video
countdown timer. by Jeffrey G. Mazur terminal and a tape reader/
40 Build A Logic Probe For S1 punch/duplicator we photo-
Easy to build TTL tester can save you hours of troubleshooting graphed them for this month's
time. by Alex F. Burr
cover. For full details see the
complete story starting on
page 43.
COMPUTERS 27 Microcomputer Trainer Equipment Report
Infinite Systems Model UC-1800
42 New Hobby Computers From Heath
Two new machines-one 8080 based, the other an LSI-11; pV db
make a powerful team. 32630600 -4420 NOTE: 1R1 EFI . 2400 I pV, -43 48
22420000 -4443
TELEVISION 32 Picture Tube Restorer Equipment Report 1390 -48
1100 -50
Oneida Model 98
880 -52
60 Service Clinic 600 -55 V = 10V
Double, double, toil and trouble. by Jack Darr 480 -51 V. 5V
370 -60
66 Reader'Questions 295 -62
R -E's Service Editor solves reader problems.
135 -66
120 -70
GENERAL 4 Looking Ahead 100 -72 VCIDUEBEO
ELECTRONICS Tomorrow's news, today. by David Lachenbruch 65 -75
45 -79
45 Pictures That Talk 40 -80
How to add sound to a silent, 8mm movie camera. RMOD
by Andrew Jaremko 20 -86 - -
18 -87 - V+
52 APaurtto mII. oHtivoew Aton tim -Cakoell isoinoen thSayts twemorsk s. by Martin B. Weinstein 13 -90 1K 11061 '47K 1 MEG
8.25K 11.2K 100K
58 Restoring Antique Radios RMOD. OHMS
How to get started with details on where to obtain parts and
schematics. by Morgan E. McMahon VIDEOCUBE INTERFACES video to RF antenna
inputs of TV set. One resistor sets RF output
70 Hobby Corner level.
Homebrew breadboard every experimentor needs. . . turn to page 33
by Earl R. Savage
STEREO 54 R -E Lab Tests Optonica Tuner
HIGH-FIDELITY AM/FM Stereo Model ST -3535 earns a "very good".
by Len Feldman
57 R -E Lab Tests Hitachi Receiver
Model SR -903 rates "excellent". by Len Feldman
Radio -Electronics, Published monthly by Gernsback
TEST 22 Digital IC Tester Equipment Report Publications, Inc., 200 Park Avenue South, New York,
NY 10003. Phone: 212-777ó400. Second-class postage
EQUIPMENT Heath Model IC -7400 paid at Mew York, NY and additional mailing offices.
One-year subscription rate: U.S.A., U.S. possessions
24 CB Tester Equipment Report and Canada, $8.75. Pan-American countries, $10.25.
Hickok Model 388 Other countries, $10.75. Single copies $1.00. J 1977 by
Gernsback Publications, Inc. All rights reserved. Printed
49 All About RF Signal Generators in U.S.A.
Part I: R -E looks at how they work, specifications, features Subscription Service: Mall all subscription orders,
and applications. by Charles Gilmore changes correspondence and Postmaster Notices of
undelivered copies (Form 3579) to Radio -Electronics
Subscription Service, Box 2520, Boulder, CO 80322.
A stamped self-addressed envelope must accompany all
DEPARTMENTS 88 Advertising Index 85 Market Center sthuebirm irtteetdu rnm ains usdcersipirtesd a nsdh/oour lda rttwheoyrk ober prheojetocgterda.p hWs eIf
12 Advertising Sales Offices 6 New 8, Timely dmisacnluasimcn patnsy anreds/poor nasribtwiliotyrk foor r pthhoet olgorsasp hosr wdahmilea gine ouorf
14 Letters 74 New Products possession or otherwise.
As a service to readers, Radio -Electronics publishes available plans or Information relating to newsworthy products, techniques and scientific and technological developments.
Because of possible variances In the quality and condition of materials and workmanship used by readers, Radio- Electronics disclaims any responsibility for the sale and proper
functioning of reader -built projects based upon or from plans or Information published In this magazine.
3
looking ahead
Home computers: The video game will evolve into New picture tubes: RCA, Sylvania and Zenith are
the home computer earlier than expected-later this offering television set manufacturers new picture tubes
year and early next. The home computer currently is which makes possible the use of the self -converging
a specialized and sophisticated hobbyist product, but slot -mask in -line -gun principle in the 25 -inch size
video game manufacturers hope to convert every without a reduction in resolution. All three tubes have
television set into an electronic brain, and prices 100 -degree deflection, thereby shortening front -to -back
initially can be expected to be as low as $200 or $300. depth. The gun is a tri-potential type, the third voltage
Most of the new home computers presumably will adding sharpness and resulting in an electron -beam
begin life as programmable games, but be expandable spot size smaller than that of a conventional gun in
to computer operation, presumably as special programs a regular slot -mask tube. If these large tubes achieve
are added. Bally, the pinball machine manufacturer, set manufacturer acceptance, the slot -mask will have
expects to introduce a programmable game later this captured the TV industry across the board in all sizes,
year at under $300, with cartridges $20 each, including resulting in easier -to -manufacture sets which require
computer capability. Said a Bally spokesman: The fewer critical adjustments.
game is expandable to do "anything IBM computers
did a few years ago." Arnold Greenberg, president New color TV's: Electronic varactor tuning, automatic
of toy manufacturer Coleco, calls home computers color circuits and energy -saving chassis are the key
"one of the imminent next generations" and says his features of the new 1978 color sets. In most cases,
company is "deep into that project." this year's changes aren't dramatic, but represent a
APF Electronics plans to introduce a $200 computer continuation of trends that started in some models
this year "priced to attract both the consumer and introduced earlier. Here's a rundown on some of the
the small businessman." Magnavox plans a game - recently introduced lines:
computer combination at less than $200 that can "do Zenith-Color Sentry automatic color adjustment
home math problems, take care of tax forms, solve system is now available in every screen size from 13
financial problems." Magnavox says it's already listed to 25 inches, in 49 of its 55 models. Likewise, you
1,800 potential home computer applications. can find electronic tuning in all screen sizes, and 22
models have wireless remote control. No major
PCM recording: Pulse code modulation (PCM) tape innovations-but rather a spread of high -end features
recording has audio professionals excited. One of the throughout the line.
first such recorders shown in the U.S. was the subject RCA-The power -saving "Xtended Life" chassis,
of a paper at the recent Audio Engineering Society first introduced in 19 -inch models (Radio -Electronics,
convention in Los Angeles by Mitsubishi. The recorder June 1977), has now been adapted to all 25 -inch sets,
lays down nine parallel tracks on 1/4 -inch tape running resulting in 25% energy savings in the 27.5 -kV XL -100
at 15 ips and records 60 minutes on a 10 -inch reel. sets and 30% in the 29.5 -kV ColorTrek sets. Varactor
Here are the specs: Tape -speed variation, none. tuning is in all 25 -inch ColorTrek models; only three 25 -
Crosstalk, wow -and -flutter, none. Harmonic distortion, inch sets lack the ColorTrek automatic color feature.
0.01%. Frequency response, DC to 20,000 Hz, ±0.5 Sony-Resting on its laurels this year, with addition
dB. Price of the Mitsubishi unit is $3,600. of only two really new models-a 7.7 -inch battery
If that's a little steep, just wait a while. Sony will portable color set and a 21 -inch remote -controlled
soon demonstrate a new black box that converts its varactor-tuned model. Sony's big change came last
Betamax videocassette recorder into a super- hi-fi PCM year with the brighter Trinitron Plus tube and the
audio recorder. Specs and price still unknown, but addition of electronic tuning to remote models.
it's scheduled to be unveiled for the Japanese market Panasonic-Became the second manufacturer (after
next fall-so an American version can't be too far off. GE) to introduce a set which automatically adjusts to
the broadcaster's vertical interval reference (VIR)
Direct -dial CB: Texas Instruments' debut in CB signal to set color and tint. The VIR feature is in one
manufacture consists of two super -deluxe units-one 19 -inch model. Panasonic also added Color Pilot, its
mobile, one base station-with a unique direct -dial, own automatic color circuit. Its 25 -inch sets (made
or selective calling, feature. Either of the new by Panasonic of Canada) use the new Sylvania 100 -
transceivers can activate any other individual TI unit degree tri-potential slot -mask tube.
when the operator punches in a pre -determined five - Sylvania-All the results weren't in at press time,
digit number on the pushbutton keyboard, placing or but one feature is a new pushbutton -keyboard tuner
receiving calls on any of the 40 CB channels or 80 that permits digital random-access tuning of any TV
SSB channels. Any five -digit number may be chosen channel, accompanied by another series of
as a calling number, and there are 8,000,000 -to -1 programmable pushbuttons which can be set for the
odds against any two users selecting the same code viewer's favorite channels for instant recall to bring
in a given area. The radios can also be programmed in the channel at a single push of the button.
to call the five most often -used numbers by pushing Hitachi-Probably America's most elaborate remote
a single button. The transceivers employ two micro- control is on one 19 -inch set, with 23 pushbuttons
processors. Prices of the units are over $300. continued on page 79
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Power Supplies Oscilloscopes Frequency Counters -VTVM's and VOM's
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Ham Radio Gear Digital Programmable Color TV Hi -Fi Components
Electronic Clocks and Weather Instruments -Le arn -at-home Electronics Courses
Auto, Fishing, Marine and Aircraft Accessories nearly 400 kits in all!
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MUM
Every Heathkit product comes with a fully - HEATH I FREE
illustrated, step-by-step assembly manual that Schlurllberger Heath Company, Dept. 020-320
tells you everything you need to know to make É- Benton Harbor, Michigan 49022 '
kitbuilding fun and easy. Thousa-nd s of people Please rush me my FREE Heathkit Catalog. '
h-a ve discovered the satisfaction and savings I am not on your mailing list.
of handcrafting a fine piece of electronic II NAME ,
equipment. You can build it better... let us show
you how. ADDRESS
' Elli
CITY STATE
Send rt Cat: log to -ay
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Beath Company, Dept. 020-323, Benton Harbor, Michigan 49022 MI MIN EN MI
CIRCLE 100 ON FREE INFORMATION CARD 5
new timely
se
Fiber-optic phone link now installed "The Board of Governors directs the New pulse generating method
in England President of the Association to pursue this produces narrower pulses
Europe's first high -capacity telephone matter with the White House in order to A new approach to pulse generation
link using laser beams over optical fibers determine how most effectively to commu- that requires only a permanent magnet, a
was demonstrated in Harlow, England, by nicate the impact of these findings and so short length of specially treated magnetic
four European companies of ITT. The advise the industry." wire, and a pickup coil, produces narrow
tlhigrhotu -cgahr rnyionrgm afli buenrdse rrgurno unneda crlay bl6e dmuicletss Mobile telephone control head is pthuels erast eo fo f1 cvhoaltn goer mof orthee, imndaegpneentidce nfite ldo.f
between telephone exchanges in Hitchin microprocessor controlled Superficially resembling other types of
and Stevenage, two towns about 26 miles The new deluxe Motorola Pulsar II generators that depend on a magnetic
north of London. The fibers are contained mobile telephone head features a number core with a coil around it, plus an
in a cable 7 millimeters (approximately of significant technological advances over increasing or decreasing magnetic field,
inch) in diameter, and can carry nearly conventional units. It offers pushbutton its action is quite different. Instead of a
2,000 simultaneous conversations. dialing, abbreviated dialing, on -hook dial- steady rise in voltage in the coil as the
The 7 -mm diameter optical cable runs ing and call processing, recall of last magnetic field increases, there is little or
through normal telephone cable ducting number dialed, channel review and select, no change up to a certain threshold level.
between the two towns where post -office channel number display, and illuminated Then the core (Wiegand wire) goes to full
exchange buildings house the multiplex- dial pad and graphics. The pushbutton magnetic saturation, producing a sharply
ing and optical terminal equipment. Two pad is located on the back of the handset, defined pulse of fixed width.
repeaters are spaced at 3 -km intervals in allowing the subscriber to dial a number in The effect is based on the discovery by
standard repeater cases in manholes safety and with one hand. John Wiegand that by a combination of
along the route. Each repeater point is torsional strain and stretching in the
equipped with two regenerators, one for manufacturing process, a magnetic wire
each direction of transmission. A total of of a homogeneous alloy may be made to
six gallium aluminum arsenide lasers is have a hard "shell" that requires a much
used in the system. higher magnetic field to change its direc-
The optical cable comprises two work- tion of magnetization than does the soft
ing fibers, a spare fiber, four metal inner core. The practical effect is that an
conductors (two of which carry the power increasing magnetic field gives rise-once
to the repeaters and two of which are a threshold field strength is reached-to a
"order wires" used by technicians) and a sudden large change of flux, which
filler fiber that rounds out the cable. These induces a voltage pulse in a pickup coil
eight cores are grouped round a central wound around or close to the Wiegand
steel strength member and completely wire.
sheathed in polyethylene. In spite of its A typical Wiegand wire could be about
novel method of transmission, the new an inch long and 10 mils (.01) inch in
system works with standard multichannel diameter. A pickup coil of about 1,000
digital multiplex equipment. turns of No. 38 wire (more or less,
The new optical telephone link will depending on the application) would
undergo several months of testing with produce the voltage. Such a wire would
speech and test signals, to demonstrate produce a 1.5 -volt pulse with a width at
the system's ability to handle live tele- 9,1414:., half amplitude of about 20 µsec. For most
phone calls, and the suitability for use in applications a magnetic field of as little as
public telephone networks. 100 to 150 oersteds is ample, permitting
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"The Board of Governors of the EIA There are three modes of operation:
supports the findings of import injury to the Home, Roam and Manual. In the Home New York Consumer Hi -Fi Show to
U.S. television receiver manufacturing in- mode, the receiver scans and selects only go into new quarters
dustry announced by the ITC March 8, the channels available in the home city. The 1977 Consumer Hi -Fi Show, Sep-
19"7T7h; ea nBdo afurrdt hsepr:e cifically urges the Presi- aT hfoer eraigdnio cihs apnrneevle. nItne dth efr oRmo almoc kminogd ei,n thoen Stehmerbaetor n1 6In, n1, 74 2anndd S1tr8e, ewt iall nbde Twheelldft ha tA vthee-
dent of the United States to give immedi- subscriber selects the channels for the nue, New York, NY. The new location,
atote t,h seesreio ussp eacnifdic afpinpdrionpgrsia otef cimonpsoirdt eirnajutioryn; cTihtye inM awnhuicahl hmeo dise opise rautsiendg aint thsey stteimmes. smtaatneys csohnovwen piernecseidse, nitn cCluhdairnlegs inRsaiyd,e ohffoetresl
and further where there is no automation. continued on page 12
tare Punch oút the big sicñal from 60 feet
Sha up with Shalóespáre s B:g Stick. The omni-
directional fiberglass bwe'station antenna
., s_es that outperforrns-ánything on the 40 chan-
T
_ nel band. Illuminating 12 times
M
I1 more, capture area -;And sending
the signal enerW diit to the
faLus horizon irI a.unkju5,,low angle
Nforld
radiation pattern
.
This half- Wave coaaial,sleeve antenna
incorporates exclusive Shakespeare engi-
¢rformanc¢.n neering ín fiberglass to cutrange taller,
heavier metal antennas under all condi-
'tións. Withstanding ice and winds up to
riIitinyou
125 MPH with no da_nae to
r
reception. And pretuned to a low
SWR over the 40 channel band
Move up fór the bíg gain with SShhaakkee--
own bac r speare's Big Stick Pretested:Nc ground
r
radials. Works anywhere with any length
of cable. Alsc available -n a low cost, 2-
piece model, Big Stick II
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The best antenna gong.Andcoming.
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Big Suck, St -le 115
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C.RCLE 74 ON FREE 'NFQAMAiÍÓN CARo,-
NRI is the only Learn computer design, con- displays the result instantly.
struction, maintenance and pro-
school to train you The NRI digital computer is one
gramming techniques on your
at home on a real of 10 kits you receive in the
own programmable digital com-
NRI Complete Computer Elec-
digital computer. puter.
tronics Course. You build and
Qualified technicians are use your own TVOM, and
urgently needed for careers in experiment with NRI's exclusive
the exciting new field of digital Electronics Lab. You perform
and computer electronics .. hundreds of experiments, build-
and the best way to learn digi- ing hundreds of circuits, learn-
tal logic and operations is now ing organization, operation,
available to you in NRI's Com- trouble -shooting and program-
plete Computer Electronics ming.
Course.
This exclusive course trains you New NRI Memory
at home on your own digital Expansion Kit
computer! This is no begin-
ner's "logic trainer", but a The Model 832 NRI Digital Com-
complete programmable digital puter now comes with a new Mem-
ory Expansion Kit. Installed and
computer that contains a checked out in 45 minutes, it dou-
memory and is fully automatic. bles the size of the computer's
You build it yourself and use memory, significantly increasing the
it to define and flow -chart a scope and depth of your knowl-
program, code your program, edge of digital computers and pro-
gramming. With the large-scale IC's
store your program and data
you get the only home training in
in the memory bank. Press. machine language programming
the start button and the com- ... experience essential to trouble-
puter solves your problem and shooting digital computers.
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