Table Of ContentTRANSISTORIZED LIGHT-BEAM AUDIO TRANSMITTER
JUNE
1955
N 35 CENTS
TE EV In U. S. and Canada
E' 1 S
World's leading Electronics Magazine
THIS ISSUE
WHY THE NARTB CURVE
FOR MAGNETIC TAPE?
THE SCIENCE OF ULTRASONICS
ID. C. TELEVISION
INSTALLATIONS
ONE TRANSMITTER
FOR RADIO CONT
R. F. POWER AMPL
MULTIPLE RECORDING
WITH A SINGLE RECORDER
THE "REBEL 5"
WHEN SHOULD YOU
PULL A CHASSIS?
"SOUPED-UP VIKING I"
HELICOPTER COMMUNICATIONS
ON 2 METERSI* o3u0 e CNV11bOd
(See Page 64) IS 31VA N kn.9
AHS9Vi 13nAvs
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BE A RADIO- TELEVISION TECHNICIAN
America's past Growing Industry
Offers You a Bright Future
1 Will Train You at Home
in Spare Time for Good Paying Jobs in
J. E. SMITH, President,
National Radio Institute,
h
Rasd iotr -aTineledv ismionre thmaen afnoyr RADIO -TELEVISION
other man. Our 40th Year.
I Trained These Men America's Fast Growing Industry Offers You
Extra Money in Spare Time
et. a"Fveoruarg emd o$1n0th tso a$f1t5e ra ewnereokll isnegrv i.c.-. GOOD PAY- BRIGHT FUTURE - SECURITY
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send helps you discover and correct in your spare time on terms as low as
You Practice Broadcasting -Servicing
ftrixoiunbg lense, ighebloprss ' ysoeuts min akspe arem otinmeye m$5a ka em moonrteh .t hMana nthye otfo mtayl cgorsatd ouf amteys
while training. Many NRI students training in just two weeks. Mail
with Kits of Parts I Send make $10, $15 a week extra this way coupon below now to J. E. SMITH,
._ 4.' vNtsprpirasoaeitconhtiniainc.nl glagSyl htideosaex wkvpbeneeas lrsoa ieetpdh nel eced efo kt pn iol itassn lc etehoca feiro rn pfcli ouanwprigtr saE bcywctyoio cuemaD rlu m OBseeoIrx Nontpoa Get drob.ic euanbMislctodieynt .h e g q TtrRuTahiairpandamtini'nsose g mn watni hitadnytne c dTrlNu yegdlRoeu-Ist eMYnocyue tbtrreaaniinneifinnitgg b myis emnp rya tc4 th0ioc yamle,ea .r csMo' meyx pwpleetrleil-. PtDu rteeCs,i .d OeDnuetrp, t4. 0N5thaF tEYio enaar.l WRaashdinog tIonns t9i-,
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munications Course. Also
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AVAILABLE TO Address..._
TrvSd1
VETERANS City Zone State
UNDER GI BILLS
VETSWorifT deis cihna drgoets.
RC
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June. 1955
3
www.americanradiohistory.com
1
OLEIVdEitRo r RaEnAd DA, sDst.S cP.,u bWliisEhTeIr o I ® oi
Managing Editor ird[ in radio-
WM. A. STOCKLIN, B. S. TE Li I o
Technical Editor te eviiton -aui/io - efecfronicd NEWS
H. S. R
SEeNrvNicEe, EMd.i toS.r AveraRgaedi oN Nete wPs aTirda deCmiracrku lRaetigo. nU . 24S6. ,P1a1t9. Office Television News Trademark Reg. U. S. RPeagt.; OUf.f icSe.. Pat. Offs.
CHARLES TEPFER
Associate Editor
P. B. HOEFER
CONTENTS JUNE, 1955
Assistant Editor
J. JUSTER A Transistorized Light -Beam Audio Transmitter
Television Consultant G. B. Tiffany & Nathan O. Sokal 35
WALTER H. BUCHSBAUM
Test Points on 1955 Du Mont TV Sets Teleset Service Department 38
FRANKA rSt AEYdLiEtoSr Why the NARTB Curve for Magnetic Tape? W. E. Stewart 40
Draftsmen Inexpensive R. F. Wattmeter R. A. Thomason 42
A. A
T. . GAA. NGSO, LWA2NTESKP D. C. Television Installations Walter H. Buchsbaum 43
Advertising Director The "Rebel 5" Jay Carver 46
L. L. OSTEN The Science of Ultrasonics 48
MAUdRveRrAtiYsi nGgO MLDanMaAgNer When Should You Pull a Chassis? Art Margolis 50
Midwest Adv. Manager A Bandpass R.F. Power Amplifier Richard Graham, W2PD1 52
JOHN A. RONAN, JR.
Distortion /Power Adapter Allan M. Ferres 55
Wester
JnO HAdNv .E .M PaAnaYgNeEr Controls for Your TV Receiver (Part 2) Esmond E. Johnson 56
All- Channel, All -Wave Antenna Joseph Marshall 58
Certified Record Revue Bert Whyte 60
Multiple Recording with a Single Recorder Jack Thornton 61
Tone Transmitter for Radio Control E. L. Safford, Jr. 62
Helicopter Communications on 21/3 Meters Richard A. Girvin 64
The "Souped -Up Viking I" Joseph W. Semkow, W7IIP 66
The "Midgetape" 70
Mac's Radio Service Shop John T. Frye 72
"Over- The -Horizon" Transmission 86
Short- Circuit Protection for Meters P. Koustas 90
"Operation Starling" Milton H. Crothers 96
Harmonic Canceler Amplifier Phillip W. Lee 98
New TV Grants Since Freeze Lift 110
C
wOaVysE,R a PhHeOliTcoOp: terL ofse edAern gleinlees, cAooir- Denver DX Contest Winners 132
sdeincoatneds ittism mianngy bopye ruatsioings wtiwtho -swplaiyt- Radio -TV Service Industry News 138
radio in its heliports and helicopters.
(Ektachrome by Peter J. Sumerjan)
DEPARTMENTS
ZIFF- NG PAé1Y
For the Record The Editor 8 What's New in Radio 102
Presrdant; Spot Radio News 16 Sales Aids 114
Within the Industry 24 Technical Books 116
Vice-Presiderss
New Audio Equipment 78 Manufacturers' Literature 126
COPYRIGHT 1955
(All Rights Reserved)
ZIFF-DAVIS PUBLISHING COMPANY
WILLIAM B. ZIFF (1898 -1953) FOUNDER
Circulation Maná
36
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RADIO & TELEVISION NEWS
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June, 1955
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MODEL TR-11 .?
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6 RADIO & TELEVISION NEWS
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J
June. 1955
7
www.americanradiohistory.com
B Y T H E E D I T O R
RADAR AND NAVIGATIONAL AIDS
NEW, and many times startling, ap- its screen, a picture that reveals
plications for electronics are becom- "fronts" and thunder storms many
ing daily headlines as this industry miles ahead. Dangerous turbulence,
continues its more -than -rapid develop- present in those areas, is bypassed by
ment of color television, communica- the pilot. The device supplies informa-
tions, industrial electronics, and im- tion on the distance and the location
proved navigational aids. of the "weather" as well as the sever-
Radar devices of all shapes and ity or intensity of a storm center.
sizes are finding new applications al- Another application for this compact
most every week. Mobile radar is a device is its ability to scan an area
fast -growing nemesis to the speedster below and ahead of an aircraft to re-
on the highways, and many small com- veal mountain peaks, lakes, ships at
munities as well as the large cities are sea, and cities. This performance is
installing these compact equipments selected by the pilot by simply flick-
in great quantity. The familiar road - ing a switch.
signs, "Policed By Radar," are now One of the major traffic problems of
fact -not an oft -tried fake warning as our ever- expanding commercial air-
many were in the past. lines has, or will soon be licked, by a
A month never passes without an new long -range radar device designed
opportunity to witness or to otherwise to reduce or to end traffic delays by
learn of some development in each of cramming more airplanes into a lim-
these specific fields. But it is unusual ited area without danger to life, limb,
New, Better Way to to find several major developments in or property. This new powerful radar,
Stock, Sell and Service one particular facet of electronics -an- borrowed from the Air Force, is being
nounced simultaneously. tested in the busy New York area. It
PHONO- CARTRIDGE Just a few weeks ago, and within a will provide data that can offset de-
period of a few hours, came the news lays in landings and take -offs.
REPLACEMENTS
of three new electronic devices de- An airplane cruising at 300 mph
For greater protection and conveni- signed to aid aircraft pilots, to elim- (under present regulations) must have
ence, E -V replacement phono -car- inate and sharply reduce traffic delays, 30 clear miles in front and 30 clear
tridges now come in new individual and to provide greater safety to pas- miles to the rear at its altitude for
sealed -in- plastic Blister -Paks- sengers flying the airways. safety. The new radar equipment (of
each with full model identification, A new and compact navigational aid much greater range) is able to show,
interchangeability chart and in- called "Tacan," announced by I. T. d on its screen, all airplanes in a large
structions. This exclusive advance- T., provides an accurate and continu- area. The flight controllers are now
ment in packaging makes it simpler ous bearing of the pilot's position to able to narrow the safe separation to
to carry and sell phono cartridge within one degree. Distance, as well from 3 to 5 miles at any given altitude.
replacements on service calls. as direction of flight relative to a fixed Heretofore, planes were picked up via
ground station, is provided automati- short- range radar when they reached
New E -V Model 47 Dual -Slide
cally and with extreme accuracy. The a point about 30 miles from the air-
Cartridge for 78, 331/4, 45 RPM unit occupies approximately 1000 cubic port and received their landing in-
New idea in replacement phono- cartridges! inches which is several times smaller structions. The long -range radar screen
The dual -slide, dual -needle Model 47 en- than that required to mount previous now shows these aircraft clearly at a
ables you to replace hundreds of different
units. The range of the new system is distance up to 100 miles.
specialized types with a single general-
classified and, as a result, the unit is This development is sure to be wide-
purpose cartridge. List Price: $9.00
identified as a short -range navigation- ly heralded by passengers of some
al aid. "Tacan" is said to provide a 533,000 flights (1954) made by the air-
FREE NEW HANDY distance accuracy of one -fifth mile and lines -many of them "stacked up"
INTERCHANGEABILITY an azimuth bearing accuracy to within waiting to land, or others sitting in a
one degree. parked plane on the ramp cursing heat
GUIDE This new equipment was designed at in the aircraft as it sits under a broil-
Tells at a glance the Federal Telecommunications Lab- ing sun.
e
mxeanct Em -Vo drepl lafcoe-r oratories in Nutley, New Jersey, and, Our own experiences of delays last
every popular crys- according to the announcement, ac- year would be estimated at a total of
tal and ceramic cepted by the U. S. Air Force as well approximately 5 per -cent of total flight
phono- cartridge.
as the Naval Air Corps. The system time. This figures about 5 hours of
yGoeut r iEt -Vno wD isftrroibm- meets the requirements for interserv- delays in 1954 alone. And our expe-
utor or write to ice standardization, it is said. rience, shared by millions, totals to a
Electro- Voice. One of the most common flight haz- lot of wasted time that can be saved
ards of aircraft has been overcome to by the new long -range radar.
a great extent as the result of a new These developments, we think, typi-
airborne radar device which is quite fy the ever -increasing value of elec-
similar to ones used by the military. tronics to our way of life in these
ELECTRO-VOICE, INC. BUCHANAN, MICH. This perfected instrument shows, on United States. O. R.
RADIO & TELEVISION NEWS
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from ALLI E D'S
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ALLIED RADIO CORP., Dept. 1 -F -5
Bargain 8 -Blade Solingen Steel Knife 100 N. Western Ave., Chicago 80, III.
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Address
Junoe, r1d95e5 r from ALLIED RADIO -- CIity _ MIN MO MM MIM =MZI o1n1=e, . MM. .MSOMt a.MtMe. 1== =MI MM. J
9
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