Absorption Uhf Wavemeters

Hand calibrated from crystal oscillators by K1CLL, Now you can find the 432 and 1296 mc bands. Know the frequency of your cloublers, triplers and oscillators. Don't guess UHF-1 350 to 675 mc 9,75 each UHF-2 600 to 1100 mc AJI four for 35 UHF-3 950 to 1400 mc Far Over Farm, Phone S03-924-3030 Peterborough, N, H* 03458 The Hammarlund HQ-180A . * . designed to meet the needs of the amateur and SWL for < t modern GENERAL COVERAGE communications receiver- Continuous tuning from 540 kc to 30 mc...

Amateur

At the recent International Amateur Radio Club Convention in Geneva, Mr. Dm Schmel-ling of the German FIT Monitoring Service read a paper on amateur frequencies* Alfred Sch dlich DL1XJ, a member of the Editorial Board of IARU Region I Bulletin, who was present, prepared this translation of the papery which was taken frojn the IARU Region I Bulletin for October 1965. A point of major interest in your discussions today is the problem of frequencies especially frequencies for radio amateurs but...

Antennas

Skip Freely, KfiHMS, who did pioneering with past Oscars, is putting ome gears and other mechanism to his 8 ft. dish to compensate for the faraday field. John Chambers. W6NCZ, also a pioneer with past Oscars, has elevation and a f> ft, dish with a probable db gain* Me has made up the 3db loss with gain. There was a thin metal foil stroll made by Andy Dolak, W6VHFf on his teletype machine, and it has ihe names of all thf* participant, giving them the honor of ha itti* their...

Apr

Power Supply RCA 10-D 350 , 500 V. 400 ma, 420 V, 240 ma., 180 V. 240 ma., 180 V. 60 ma., also 12 V., Brand new in crates. Approx. Dynamotor, PE-I03, 6-T2V., 500 V. 160 ma. 8.00 Modulator, RCA Ml 22565, 345-485 watt 40.00 Brush Co 0A1 recording amplifier 8.00 Mark II, B-29 Xmitter Aircraft Torpedo Camera, type 1 15,00 AN merchandise is guaranted to be as represented, When ordering give second & third choice if possible in case your original item is sold. 25 required with COD orders. To avoid...

Avc Line

Three stoge 28 mc if amplifier. CIO, CI 2, C15 and CI 6 are .01 Mf. The complete 1215 mc tunable transistor superhet receiver. The rf components are at top, the if in the middle and audio at the bottom. security because of a possible open or short of the IX circuit when used with different cables or inputs. The second and third stages do not need rf chokes. Lfi feeds the diode* a Sylvania 1N295, which demodulates the signa' and also furnishes AVE voltage- A word here about YC for...

Broadband Ferrte Balun

Completely Weatherproof 1 1 or 4 1 Ratio (specify) Mounting for Beam or Dipole Nearly perfect characteristics are obtained fay the use of low loss ferrite material and special winding techniques. The transformer is completely encapsulated in plastic to assure freedom from moisture or shock damage. Model 601 is designed for a 1 1 ratio (50 ohms unbalanced to 50 ohms balanced) and the Model 601A is available for applications requiring a 4 1 ratio (50-200 ohms or 75-300 ohms)....

Dlq

250TL 19.45 VR92 . 9 11 388A . 3 31 41GB IG.ftn 450TL 43.00 BIS 9. II . 1.75 VOLT-TABfl 900Watt Speed Control 115VAC S4.50 ft. 2 for 9_ B66A Xfmr 2.5V I0A lOKv tnsi 9 < S> Ballentlno 300 AC Lab Mtr. 54 < Sd) Choke 4Hy 0.5A 27fJ 40 2 G JiVARIACS'1 L N 0-rS5v 7,5A Jf5 VARfACS L N 0-I55V 3A 119 TWO B66Aps & Fll, Xfmr 16 SILICON TUBE REPLACEMENTS UNIVERSAL tL 3 IS HSORmt ieOOfnv S2 9 95 l900Rms 2800lnv 9 (ft. 2 f5 5Kv Rmi * l .4Kv Inv

Coil Mounting

It's buift on a piece of copper clod bakelite with shields between each of the three stages. This is the heart of the amplifier, I like the 6 32 internal threaded paper coii forms because they are small and only cost a few cents apiece. There must of course be some method of tuning the stages, whether by making CI a trimmer or by adjusting the powered iron core in LI. The kilter takes up less room and costs less. A drop of wax will keep the core from turning after...

Company

213 East Grand Avenue South San FVancisco, California 94080 (a) 1 h American amateur bands in effcc* when the international Radiotelegraph conference met in Washing-toil in J 92 7. I500-2000 3500-4000 7000-8000 14,000-16,000 2 S .000-30,000 56,000-64,000 400,000-401,000 (b) The international amateur bands set by the Washing loo international conference and made effective worldwide on January I, 1715-2000 5 500-4000 7000-7300 14,000 14,400 2 St000 30T000 56.000-60,000 out for no message handling...

Corner Frequency

The output signal-to-uoise ratio is always lower than that of the input Noise figures of amplifiers are therefore always greater than 1. It is convenient to speak of noise figures in terms erf decibels (db) because of certain mathematical relationships. The noise figure in decibels is a power relationship equalling 10 Iog1(l NF. A perfect noise figure of I is equal to 0 db. Let us now consider adding a preamplifier to a receiving system. Using the information from the last paragraph, we know...

Dc Ac

Series and shunt rectification, Left. Fig. 2. Step-up by LC resonance, Right, Fig, 4, Voltage doubler bras supply. of the resistor in these tests appeared to be somewhat critical, voltage dropping as the resistance was either increased or decreased in value. For higher voltages, a choke should be used. Fig. 2 shows how this works. he choke and (he input capacitor form a series-resonant circuit so far as the uc source is concerned, if their values bear the proper relation to each...

Electrolytics

Dual 35 mfd 450V Metal Can Octal Plug-in, 5 1 .00 li)0 17.50 150 mfd 250V Octal Plug-in 4 51,00, 70 mfd J 50V Cardboard, Axial leads 1 dia. x 2 7,51.00. Multiple 60 mfd 175V, 60 mfd 150V, 20 mfd 25V Cardboard 1 dia. x 3 6. LOO. 1000 mfd, 52V 85C. x x 2Vi Rectangular Compression Trimmers, 2-18 mmf, 10 51.00 Hand es, Nickel Plated Brass, 6 centers, l-Ve hand clearance 5U9 value ,40 pair. National Velvet Vernier Dials 4rr 5-1 ratio, Puilouts All equipment subject to prior sale. F.O,B.

Electronics

LUBBOCK, TEXAS 79401 Case can id for tools, stontg i lunch elc, M tdi' of rugged poly pro pylene. * Dual Heat Soldering Gun Accessories Plastic Case ' Gun has 2 trigger positions. Switches low 100-watt or high 14m-wiiU heat. Tip heats instantly. Sputlighr. AUo included plasttc utility cast*, 3 sol-define tips tip wrench, soldering aid Selects any one of three inputs may be cascaded Uses standard SO-239 (UHF series) connectors Negligible insertion loss and leakage Sturdy...

Freql

(3) The audio ahead of the RT converter. 1 his article will discuss each area. Your particular receiver may be ideal in one or more of these areas. You should be able to judge from the following discussion whether vou will benefit from some modi ft cat ions in your receiving set-up* As in any communications system, the bandwidth of the if amplifier should be no greater than necessary to pass the spectrum of the signal you want to copy. Fig, 1 illustrates the spectrum of an FSK signal xisiug 850...

Ham

ATV RESEARCH chalk nges lnyoni1 to r-f you on TV nwne sconcuhicjjIly fhfln tvc con Here's why We furni- i you wtih onty the hard-tC'iinJ tOniporiEnli and eosyto-undcrstand pion& . You supply the an-d-dfJ fesistars, capacity and' hardware from your junkho*. In fhis manna* Wftctitaljy every-on tun aifurd to ga TV* and fiQVi fun doing it Build 0 live TV camera chetjpe ihtpn ever befare Strokes 5 3utic crreuil lo fare. hy hundred f of cbni utt(ir& all over the eounrry, EXPERIENCE THE FUM of...

Ham Rtty

RTTY is growing very fast Even the ARRL has accepted it and is now broadcasting bulletins in teletype. This book is the most complete one on the subject. It's written for the beginner as well as the expert and contains pictures and descriptions of all the popular machines, where to get them, how much, etc. 2.00 The nautically nice Robinsons are blue w ter sailors, From Penobscot Bay in summer to the Bahamas in winter, Robbie (W2EYY) and XYL Etsa cruise the Atlantic in their 56-foot ketch...

Hauicrafters Srigg Ac Dc

Supplies mounting rack HAUICRAFTERS SR-500 AC supply-demo HEATH HW 12 HP-13 supply SBE33 with AC DC supply SBE SB34 SWAN 120 DRAKE 2B calibrator speaker DRAKE 2B ealibrator Q speaker HAUICRAFTERS SKY BUDDY li HAUICRAFTERS 553 HAUICRAFTERS SX 62A HAUICRAFTERS SX101 Matk 3A HALLICRAFTZRS S 108 HAUICRAFTERS SX-115 HALUC FTERS SX-I40 HAUICRAFTERS SR-3000*new HAMMARVUND IHCM29X speaker HAMMARLUND H0170A HARVEY WEU.S R92 NATIONAL NC-98 NATIONAL NC-125 speaker SSB EXCITERS HAUICRAFTERS HT-32...

Evw

Buy these certificates to dress up your shock. Be proud of the effort it took to earn the money to be able to afford them. The Certificate Haters Certificate is available to any ham with 1 who submits a signed statement that he has never heen awarded any other certificates and that he will hate any that he happens to get in the future. Th e Worked Almost All States Certificate is available to hams who have proof of contact with 49 states. It lakes almost as much effort to work 49 as 50. Why...

Ygh

R 2 9245 Palar Relay i 255A 35 2 for 19 W.E. Socket for 255A RoTayt 32.50 Toroids SSMhy New Peka l ft, 6 5 6.3VCT I5.5A 4 9.3VCT ft 2A S4 2 19 200KC Fraq Std Xtolf 2 ft, 2 3 Printed Ckt Bd New Blank 9x12 1 Vlfxon 5A Reset Ckt Breokor tl B S5 2K to RK Headsets Good Us d 3 2 5 Xtal Blanks Asst Typos 12 for 1 BamlswUeh Ceramle 500W 2P GPos S3 2 for 5 1> Hy-305Nta Choke Cased S3 2 5 7-Vt Hy-400Ma Choko Cased 7 2 SI 250M fcl 450 Wv Loettytlo 4 SSB 8 Cnflir OH tOMTd...

Info

Me Lloeirirt Tamil Me C.rBtnd HIM PhJStli Ar' * muiUHft Ertflfi UJtlHM fj . 1 JC Affi t iMf Md fttfrl t l V h Jj WHha - r- I E Pjrit- 5 The VHF Antenna Handbook it your camplct guidt to VHF and UttF antennas. This outstanding book ii by Jim Kyle K5JKX, one of the outstanding technical authori in the electronic field- The VHF Antenna Handbook covers complete theory end 11 practical details far ettfy type at VHF and UNF an henna A Special feature ti the commertiil an Tenno catalog auction If...

Interference

Improvement in interference by increasing if selectivity. Fig. 1. Spectrum of 850 cps shift FSK signal Fig, 2. Improvement in interference by increasing if selectivity. Fig. 3. Product detector circuits that con easily be adapted to most communications signed for AM signals 6-10 kc wide. If you are using one of these for RTTY you should definitely take steps to improve the situation. To illustrate how effective using the correct if bandwidth is, take a look at Fig. 2. Here a receiver...

J

Fig. 4r Connecting the adapter to a transceiver. then tune up the BFO and check your audio circuits. Lf these operate properly, go back to the input of the second i) transformer (T2) and, after inserting the two following crystals, tune up the transformer. You can then set your oscillator to the exact center frequency between the two crystals and touch up your EKO coil slug. Now move the generator back to the input grid (G2) of the first 6BE6 and, after disabling the oscillator section by...

John Meshna Jr

Synchronous clock motor driving a gear train to produce one revolution 8 hours with analog output by means of a precision 10K pot. Reset with another built in 115 V 60 Cycle motor. May be taken apart for the 2 motors, one a precision motor driving a gear train and the second motor 60 cycle induction 115 volt I've been reading A*G.W, Cameron's book on Interstellar Communication. Very interesting. They have such complete proof that interstellar travel is impossible ami that radio communication is...

K

Fig. 5, Schematic for audio mark-space filter. can demonstrate erv dramatically how the filter can allow perfect copy even with heavy interference. Looking back at Fig, 1 we can see that the FSK energy is concentrated about the mark and space frequencies. The filter to be described lias response curve as shown in Fig* 4. Note that (lie response is down over 20 db halfway between mark and space. Thus, we can have a CW signal at 2500 cps nearly 300 times as strong as our RTTY signal and still get...

Pdp

PURPOSE PNP TRANSISTOR terminals, or at a high impedance point such as the earphone jack. The major consideration involved in the organization of these circuits into a complete unit is impedance matching* The receiver output impedance must match the filter input impedance the filter output impedance (usually the same as its input impedance) must match the audio amplifier input impedance the amplifier output impedance must match the trigger input impedance the detector output...

Kjkx

Gregory Urbana, III. Its well known that crystals supply probably the cheapest and easiest method of fairly accurate (and stable) oscillator control. Most of us have used them as transmitter control at one time or another. And most of the better high frequency receivers use crystals extensively as local oscillator control. But how many of the hams reading this have fallen into the same questionable habit as I trusting their crystals, I'm not implying that crystals aren't...

Kkz

Built-in universal power supply Both 12V DC and 117V AC merely by using proper line cord provided. NO INVERTERS NEEDED, Expanded frequency coverage . , , 250 kc on all bands, MARS and out-of-band DX coverage. Receiver DELTA tuning . , . gives tunable range of several kc either side of transmitter frequency. No Panel switch selects upper or low f sideband without frequency shift Built-in loudspeaker Terminals for external speaker. J

Liberty Electronics Wants To Buy For Cash

Most any type or quantity Receiving, transmitting, special purpose, magnetrons, klystrons We will make yoti an immediate otter in cash. Surplus communication and test equipment AN GRC-3, 4, 5, 6, 7, 8, 10, 19, 26, 27, 46, VRG-12 AN PRG-8, 9, 10, 25 Test equipment with ARM, SG, URM, UPM, USM, and TS prefixes Communications AN TRIM, 24, 35, 36 Receivers AN APR-9, 13, 14, R-388A, R-274, R-390A, R-391, etc. Indicators ID-250, 251, 337, 257A etc. Aircraft AN ARC-27, 34, 38, 44, 52, 55, 57, 73, 84 AN...

Liuiih Ii

< .rp Ji h i. - i . < .rp Ji h i. - i . Fig. K Schematic diagram of the OI31 AR automatic selector mechanism, lor turns ihe receiver tuning drive and tlie contact arms until the contact arm bridges the gap (E) between the disk segments, both relays are then closed, removing voltage from the motor and the drive stops at the preset position. Turning the remote switch to another position will start the tuning cycle again. For operation from a 12 volt dc source, the relays in the C-131 AR unit...

Mixer

Crystal Decade Frequency Generator. Conv ponents are chosen to include the 80 m amateur band in the generator range. Fig. 3. Crystal Decade Frequency Generator. Conv ponents are chosen to include the 80 m amateur band in the generator range. peaked near 425 kc and the other near 475 kc. All other adjustments are for maximum output. It would be wise to calibrate at least roughly, the tuning dial of C3, to avoid selection of an undesired output frequency. This may be easily done by...

Mobile Or Fixed Station

POWER AND PERFORMANCE, INCLUDES BUILT-IN SPEAKER AND GIMBAL MOUNT E-Z TUNING WfTH BANDPASS EXCITER DE-StGN JUST PEAK OUTPUT FOR SMALL QSY. Illuminated VFO dial with 2 kc calibration. High impedance mic, input with push to-talk operation, Combination S-Meter Output indicator. Smooth vernier (12 1 slow and 2 1 fast) VFO 300 Watts PEP SSB input, covering 3.3-4.0 and 7.1 -7.3 mcs. LSB SO arid 40 meters). A pair of proven 6HF5 finaf tubf s, Separate, relay switched, tuned RF receiving stage, Vi uv,...

N

Lost and it is even harder for the audio oscillator to follow the signal. The addition of a dc filter in front of the relay makes a bad situation worse, since it hies to even out the difference in amplitude between the signal and the noise. As the code speed increases, these deteriorating effects cause mote and more trouble. What is needed is an electronic switch to replace the relay. In particular, we want a switch with an adjustable turn-on voltage we would also like the switch to produce a...

Ncl

Entire equipment LC.ATS. rated for full 1000 watt average, 2000 watt peak input output tubes and alt RF components rated for C.C.S. operation. Power input and efficiency identical on all bands- 80 through 10 meters. _ Completely self-contained, including power supply, in desktop cabinet (dimensions only 7 H 16 W, 12 D). ____ Adjustable passive grtd input and use of high power ceramic tetrodes in final permits drive to full output with exciters delivering as little as 20 watts or as much as 200...

New Parts

Transformer, 230 V, Pri., 3150 V.D,C 500 ma,, 2625 V.D.C. 600 mo. appro*. 100 lbs 5 29.00 National 4 gang Var. Cond., Min. 15 mmf. max. 225 mmf(J with P.W, drive & dial, boxed 12.00 Blower, Rotron, Series 320-AS, 11 5 V. AC 8-00 Dual Choke, 5.03 HY. 600 mo., 3.48 HY. 600 ma. 5.00 Auto. Transf. 115-120 V. & 208-230 V. 10 Amp. 5.00 FiL Transf5.63 V, CT. 14 5 Amp., 5.35 V. CT. 13 Fit Transf. 6.4 V-6.6 Amp, 6.1 V-3.5 Amp. 5.00 Choke, 10 Hy. at 110 ma + 1*50 Capacitors, 4 Mfd, 10 KV. 7.00 .5...

New York

Singles 3.50 to 6 Doubles 5 to 9 V rite, Wire or Rhone for Reservationi iO WEST 47th STREET 2 Slocks from Rockefeller Center Here's another clever idea from Amperex. It's a heat sink for manufacturers of solid state phonographs, etc. The interesting thing is that the sink is slightly bowed so that it s easy to insert TO-1 transistors in it, but tightening the sink to a chassis straightens it out and clamps the transistors very firmly for excellent heat dissipation and low thermal resistance, It...

O

In this formula, it is seen that Noise Figure INK) is a ratio of the input signal-to-noise ratio (Si Nj) and the output signal-to-noise ratio (S,. TJ. Pretty confusing Not really, ii one considers that a high signal-to-noise ratio is what is most wanted. In an ideal amplifier with no noise, the input signal and noise would be amplified the same amount, and the signal-to-noise ratios would be the same. (Sf N, SJNJ. The noise figure would be I (0 db not I db). Because the amplifier is not...

Of Amateur Radio Membership Application

, 5 enclosed for one year membership in the IoAR. 7 enclosed for foAR membership and one year of 73. I am a Charter member and desire to have my membership continuous. Institute of Amateur Radio Peterborough, N.H. 03458 Carol Allen K9AMD W5NQQ 155 Karen Drive Lafayette, Louisiana Did you ever work it iiero on the ham bands You probably have and didn't even know it , l or I he airwaves are full of signals from folks who have earned their tickets in spite oi illnesses, accidents, and birth...

Of Parabolic

For serious amateur moonhounee experimental work, one must have an antenna that provides a very narrow beamwidth plus adequate gain. The ultimate array for the EME circuit on frequencies of 70 cm or above is the parabolic. With an aperture of just 10-15 wavelengths at the operating frequency, a beamwidth of 4 or better can be readily achieved. Below 70 cm the size of the parabolic required to allow its capabilities to be fully employed is the limiting factor for the average amateur. Unless...

Ok

Have Y2 4FZ 5 4,4Zr Z or 156 feet- This is the depth of the parabolic reflector. The other corresponding points along the reflector are found employing the same procedure. Now, or a check on our calculations, let's see if our Depth (Zr) corresponds with the formula focal length j. Substituting the known values, we have 4 iOO 24.96 or 4 4,007 (close enoughl). Before you buy QSL cards from anyone Write for FREEfc1966 CATALOG & SAMPLES. TopP Fast Delivery & Low Wholesale Prices. HAM...

On

The pursuit of single-signal cw reception has generally lead to the use of highly selective if and af filters. Unfortunately, the use ol sharp filters inevitably results in severe signal distortion, since the shortest rise time a signal may have in order to pass undistorted through a filter is equal to the reciprocal of the filter bandwidth. Because the maximum rise time of a signal at 455 kc is about 10 microseconds, a filter that would pass it without distortion would have to have a bandwidth...

Order Today

MISSION HAM SUPPLIES 3316 Main Street, Riverside, Calif. SHIP ONE STONER RT-1 CONVERTER QUOTE trade allowance and terms. Q Please send latest HAM flyer. Put me an your mailing list, (Cash orders shipped FREE in continental U. S.) Bill Hoisington Kl CLL Peterborough, N,H, This article is the third part of the UHF transistor siiperhet receiver series that started in the December 73. The first article deScribed the mixer and the second the oscillator, This one takes care of the if strip, audio...

Out

To measure loss exactly, determine the amount bv which the peak misses zero, and also the fl at voltage'1 just as in measuring S V t. Then calculate the corresponding ratio A This is the square of the fraction of voltage lost in a one-way trip up the line, since your measurements were made on a round-trip basis. Hut since power varies as the square of voltage. It is also directly the fraction of power lost in the line on a one-way trip, and can give you the loss in db. To convert this power...

Parametric Amplifiers

This book, the first on parametric am bamt is written for the average amateur sample language how they work, how to for the various UHF bands, and how to Parametrics have helped UHF move into but don't forget that the first working pfjfter was built by W1FZJ and worked Order this book direct, 2.00 postpaid, or parts distributor. pfifiers for the and explains in build your own tune them up, the space age, parametric am-on si* meters from your local F. D, Whitmore W2AAA 223 W. Holly Ave. Pitman,...

Personal Individual Service Guaranteed

Jim Kyle K5JKX Oklahoma City, Oklahoma J 236 NE 44th Street Daring the past decade, literally scores of devices for checking out SWR, antenna impedance, and related items have been described in the amateur press. They include bridges, directional couplers, and other exotic hardware. But one of the simplest and most useful devices has apparently been overlooked during all this time The device (a technique, really) we're talking about will (1) give you a direct visual picture of your SWR curve,...

Peter W Dahl Co

Minneapolis, Minnesota 55414 Curl up this winter with 20 assorted fascinating back ssues of 73. They'll keep your mind, imagination and soldering iron warm through the cold nghts+ Our choice (but an excellent one, of course) at this low price, 20 for 55, Eight fabulous back issues of our choice for a puny 2, Indfv-dual back issues are SCk apiece except all of 1960, February, March and April 1961, and June and November 1962, which are January 1961 and December 1962 aren't...

Power Source For Rt Is Controlled By Exciter

Owners of SBEf SB2-LA linears have money in the bank (This 1000-watt n e.p input beatity costs only 24.95 cents-per-watt, half the cost of other l KW p.e.p. linear amplifiers.) (This 1000-watt n e.p input beatity costs only 24.95 cents-per-watt, half the cost of other l KW p.e.p. linear amplifiers.) wives of owners of SBE linears are often pleased (at the small equipment size and uncluttered appearance . . particularly so this winter when the OM moves the shack into her nice living room.) and...

Q Iqi Output

Squaring circuit with no hysteresis. Above, Fig, 5- Emitter follower. stage of the Schmitt trigger is saturated by any signal above the turn-on threshold. This means that the Schmitt trigger's output voltage is rectangular-ideal for controlling the audio oscillator, as a source of either unblocking or anode supply voltage. The turn-on threshold is set through cathode biasing. By using a variable bias control, the input voltage required to I rigger the circuit can be adjusted,...

Radio Amateur

Chicago, 1 60639 Bottom view of the transmitter section of the Astro Ten. Bottom view of the transmitter section of the Astro Ten. With Ql> and Q3 removed, and a milli-Smmeter 111 series with the collector of Q5 (see schematic) apply power and press the transmit button Qr> should draw between 200 ma and 350 ma, I il is far outside this range check Q and Qr> . Now interrupt power (go back to receive), replace Qu Q2 and Q f> aPP'> milliameter as shown to...

Radio Amateurs Great Circle Chart

OF THE WORLD -lrom e center ot ttie or six major U S. cities-. Boston W ington, D.C., Miam', Seattle, San nan Cisco & LOS Angeles. postpajd 1 00 UNITED STATES MAP All 50 States with call areas, prefixes. OX and tune zones FCC frequency alocatmn hart Plus interesting Information on all 50 Stales, full color, 29 X 17 postpaid 50i WORLD ATLAS-Only Atlas compiled for amateurs. Palar projection s.x contents, pref.es on each country color, 16 pages postpato Complete reference library of maps-sej...

Raytheon Company

Scl San Francisco, California 54030 Export ultl Raytheon international Salet & Services, leiiflgton 73, Mawachusetts U.S.A, Ron Gunn WA6KLL 358 Albatross Ave. Livermore, California Home brew phasing type generation of SSli signals has numerous advantages over filtering. First, the frequency is determined by the builder, not the manufacturer of some filter. Second, it is cheaper to build. Third, sidebands are selectable without changing carrier oscillator frequency. The...

Rcvr

Ken Sessions K6MVH 4861 Ramona Place Ontario, California Drawing by K3SUK Ken Sessions K6MVH 4861 Ramona Place Ontario, California Drawing by K3SUK Probably the most important task a 6-meter man will encounter is that of convincing irate neighbors that channel 2 interference is due to inadequacies in his TV set. When faced with a TVT problem, the amateur must convey a considerable amount of information to his neighbor in a fairly short time. For this communication to be effective (and...

S

10 TRANSISTOR E L ECTROLYTICS lOmf to SOOmfS 50 COILS I CHOKES, if, rf, nm, osc, A 35 TWO WATTERS, WX Inri A.R., loo . . O 75 HALF WATTERS, mt iiwl A.B., 5 too . , 60 Hi-Q RESISTORS, 1 . 1.2W, IT* A 5 tf values 10 PHONO PLUG A JACK SETS, tuner f amps , . S MAGNETIC WEED SWITCH, sealed 30 H + YELLOW * MYLAR CONDENSERS, asstd va AO CERAMIC CONDENSERS, discs, npo+s, to ,05 40 *TfNYTl RESISTORS, 1 lOVV, 5 iv ----S JO TRANSISTOR SOCKETS for imp-npn transistors J 40 WORLD'S SMALLEST COND,( to ,05 mf...

Scope

Chopper circuit necessary far AC coupled Fig. 2. Chopper circuit necessary far AC coupled have no problems at all here. If not, hook up a chopper as shown in Fig, 2 to give you a zero-reference line. Now any DC output from the probe will appear to the scope) to be AC square-waves, at the frequency at which the chopper operates. If a code buzzer is used, this frequency will be around 1 kc, and since the sweep rate is so much lower, the scope trace will approximate a pair of straight...

Send For Rohn Tower Handbook

ONLY 100 postpaid (special to readers of this magazine). Nearest Hource of supply sent on request. Repre-sentntives world-wide to serve you. Write today to I > JlO> > . V. L-. M U J J. M I 'World's i nrgi'sr EXi I.US1VE Manufacturer of Towers d signant, engineers, and installers of complete ommiiriicQt on tower systems. course. Here we not only have to contend with foreign broadcast stations, but our own umpteen kilowatted VOA are staked out every few kc through a good part of I he l)and...

Ssb Twins

Features The SX-146 is an amateur bond receiver of advanced design, employing o singte conversion signal path and pre-mixed oscillator chain to assure high order frequency stability and freedom from adjacent channel cross modulation products. This new breed of receiver employs a high frequency quartz crystal filter and has provisions for the user installation of two more crystal filters. While shipped from the factory for amateur band coverage only by conncction of auxiliary oscillators, the...

Subscribe To

Name year 4 2 years 7 Address yeors 10 New subscription City Extension of sub . , , State < . v., i - - Zip Code . loAR far one year and 73 for one year 7 , 73 Magazine, Peterborough, N. H. 03458 Roy Pofenberg W4WKM 3 6 Stratford Avenue Fairfax, Virginio 1 he t> pical aircraft Command Set installation used a remote control station located for convenient operation b> the pilot or, in some cases, another crew member. The receiver and transmitter were fitted into whatever space was available...

T

10 PNP SWITCHING TRANSISTORS, no test fisat 010 NPN SWITCHING TRANSISTORS, no test asst.J If PNP TRANSISTORS, (K722t2NM,l 07 no test 1 5 NPN TRANSISTORS, 2X3 Ii 1T0. -140, no test S 30 TRANSISTORS, rf(1ft iw i uac-ii*.TOS no S 10 FAMOUS CK722 TRANSISTORS, n te 5 2N107 TRANS' RS, hy C.K, r> np, pop* audio pak S f 2 40W NPN SILICON MESA 2N104B t 2N CM8 4 2N21 3 TRANSISTORS, mixfr-ronv, T 22 . , . 10 MICROD ODE STABfSTORS, t-po& y, silicon -5 3 2N706 500MW, 30QMC NPN PLANAR, TO J l . j 3...

T M

High Power Capability Capable of maximum legal limit on SSB. Widest Bandwidth Better than ever . . . maintains minimum SWR over phone portion of 40, 20, 15, and 10, 60 KC wide at 2 to 1 SWR on 75 meters. Low SWR 1.1 to 1 or better at resonance no special matching required. Proper Base Impedance Nominal 52 ohms at resonance no magic lengths of feed line or matching devices required. Low Frequency Drift Frequency drift from heat held to absolute minimum. Here s 413 reasons for exceptional...

Tcu

THERE'S A WORLD OF OPPORTUNITY FOR THE MAN WITH AN FCC LICENSE THERE'S A WORLD OF OPPORTUNITY FOR THE MAN WITH AN FCC LICENSE All it takes is a few spare hours a week and NRi*s FCC License Course to open the way to increased opportunities in Communications, With an FCC License, you're ready to operate, service and instal transmitting equipment used in aviation, broadcasting, marine, mobile and Citizens-Band communications. What does it t jkt Men with absolutely no training or experience in...

Te T Ron

Value of these two condensers slightly. This probably will not he necessary however. The four crystals are rather common on the surplus market and are obtainable for a very modest price. They come in FT241 type holders and are marked in channel numbers. The ones used for this filter are marked channel 41 and 321 (two each ' which are for the narrow passband. The second if transformer between the two crystal filters is identical with the first. Here again it may be necessary to pad the windings...

Test Equipment

URM-26B, brand now, Signal Generator __________ 295.00 URM-25D, Sig. Gen. used, good condition 325.00 Measurements Corp., 80R, Sig. Gen 450.00 Tektronix Scopes, 51 I -AD 175.00 5I3-D ____________225,00 Freq. Meter, Navy LM type, brand new in original packing case, wilh Orig. Calib. hook________75.00 Freq. Meter, same as above but used, good Cond. 49.00 URM-26 Sig. Gen., used, good condition 175.00 Scopes, Dumont 224A 29.00 241 49.00 303 Scope, Eico zr460, D.C to 10 M,C. for color or black &...

Transistorized Converters

New series 300 with VHF-UHF transistors, crystal-controlled oscillator, tuned R.F. stage and low noise mixer. One microvolt sensitivity, More than SO high quality parts carefully assembled and tested. Measure only 3 x VAT x Choice of I Input freq. and 1 output freq, between .6 and 160 mc V*. Operate at 12 volts DC 4-5 ma. All above converters are supplied with Motorola type connectors, For two SG-2.S9 connectors instead, add 75c. Kuvistor converters available from 10. Circuit modules and...

Two Categories To Choose From

Standard Duty Guyed in HeigfiU of 37 - 54 - 88 - 105 ond 122 feet Heavy Duty Self Supporting and Guyed in Heights of 37 - 54 feei (SS) 71 38 feet guyed) Ease of Operation roll if guides between sections aKSUie easy, safe, friction-free raising and lowering. Strength welded tubular steel sections overlap 3 feet at maximum heifihi for extra sturdiness and strength. Unique R HN raising procedure raises all sections together uniformly with an equiit section overlap ar oil heights Versatility...

Two Way Radio Engineers

1100 Tremont Street, Boston 20, Massachusetts Model S-1T-A D.C to 200 KC, 3 11*x5x7 Ship, wt, 1New 5169.75 Our price 49,50 Model S-U-A ac. to 180 KC, 3 1 2x6x7 Ship, wt. 17 New 282,75 Our price 89.50 Model S-1 5-A Dual Screen 1-W* x 3 1 2*Wx7 5ERVOSCOPES MULTIPLE SIGNAL GENERATORS These units feature a calibrated phase shifter and built-in Electronic Sweep, They produce sinusoidal, modulated sinusoidal carrier frequency and square wave pottems. Used with Scope, can provide gain and phase iead...

U R

M lea Condsr .009 ft 2500V 4 SI SnooperfMjie Tubo V *5 ft. 2 19 Mini-Fon r l2Vae 60Cyi 2 8 15 4X150 Ceromh Laktal S 1.35 2 2 Ll Filter 50Am 250VAC HO ft, 2 116 DC 3 j Meter RD BOOMo 4 Battery Charier B4I2V Charflu up to 5Amp Appr vod H avy Duty O*-ttfn with KUion CJrtnlt Br okor. Operates 220 or 119VAC ft Tran tormor All Input Hfv 90Cyi VCT g 250Mot 6V 9A 5A 3A S6. 2 Sro 400V D C Supply ft 200M A 4 SHIeen Roet i Filters ST9 Line Filter 4.5A Line FHter 5A ft

Versatile Miniature Transformer

Same as used in W2EWL SS3 Rig-March, 1956 GST. Three sets of CT windings for a combination of impedances 600 ohms, 5200 ohms, 22000 ohms. By using center-taps the impedances are quartered). The ideal transformer fci a SSB transmitter. Other uses interstage, transistor, high impedance choke, line to grid or plate, ctc. Size only 2 h, x Wr tf. x W' d- New and fully shielded. Model TX 62 complete 75 W phone A CW transmitter has bu'iMri power suppty and modutator. Tunes easj y by adjusting final...

Volt Batterv

Block diogram of the complete UHF receiver. base voltage flexible and 10 k for R9 allows the diode a stiff control of that voltage. This circuit works fine as is with AYC control ot the second stage only, ( use a 1 ma meter in the collector supply for an S meter, shunted down with just enough resistance to read near 1 ma with not signal, I would suggest a good large meter with correct swing damping and possible a jack and plug, it you intend to use it for much antenna work with the...

Volts

UA*fi TLUNS LIB - 12 TURNS L2 - 2 TURNS LS * 2 TLWS the input is another of these stages (shown at L3i> RFC and CI are not needed. A low impedance cable or link should be connected to A and B while testing or tlie stage may oscillate. It won't take off in the final if strip, The base bias is shown as adjustable. This is to set the gain and current at the correct point, but fixed resistors are used in the final circuit. As a general rule, you can use 5 k from base to ground and about 33 k from...

Vswr

All this time we've been talking about the use of the sweep technique for a specific application with a specific value of impedance, 75 ohms. What about other impedance values If they're fairly close to 75, you can use an impedance-matching pad for terminating the sweep generator, his is a T-pad designed to see 75-ohm impedance on one side, and whatever impedance you desire on the other To perform its job properly, such a pad must have a certain minimum loss, and the greater the separation...

Wbegz

Ben Raju VU2NR B-22 Nanak Pur New Delhi, India We, in India, have no manufactured amateur equipment in the market of the quality required for SSB operation. Our Government does not allow import of non-productive machinery, which covers most of our ham gear. Besides most of us do not have necessary finances to buy it off the market either. Yet our ambitions are high. We want to keep up u ith guys in the other parts of the world, I he only way to do it, is the hard way. We home-brew our...

We Want To

Surplus Aircraft Radio & Test Equipment W& will pay cash or trade you whatever you need for the following items Test Equipt. Signal Generators. Measurements Corp, Models 65 B Boonton Radio Co. Modeis 232A, 235A. Hewlett-Packard Co. Models 60BO, 61 2A, 624C Military Models, 5G-1 A, SG-2, SG-13, SG-66A, MD 83A, TS-510A. Aircraft Navigation & Communication Equip . ARC-34, ARC-38, ARC 52, ARt 73, AFtN-14, ARN-59, ARN-73, ID-249A, ID-250A, ID-2SIA, ID-351A, ID-387. We also wont late type...

Wehu

Age even while operating transceiver Input and Output Cables furnished with all supplies. r 7 Order Through Your Dealer. For Additional Information Write S a I r- It. - J r I Jim Kyle K5JKX 1236 NE 44th Street Oklahoma City, Oklahoma Need some negative bias voltage lor that new rig Or maybe you're building an auxiliary power supply for one of the popular SSB transceivers such as the Swan, which requires negative-volt age output as well as the positive variety. Now (if course there are dozens of...

Works Gwp On Metres

INDOORS ZL4G A's JOYSTICK got him 569 on 3.5 mo from G5WF on 21st February, 1965 at 0S50 GMT. AJan had worked VE7BIY on 3,5 mcs at 559 and also logged 59 countries on 14 m cs by that date, including LU1HBS and 9M4LP. Testimonials continue to pour n read W70F's fantastic resultsf Partridge operate a rigid, 100 Money Back Guarantee if you're not completely satisfied This ticket will bring you the new brochures by return of mail

World Radio Cabs

MOST COMPLETE CATALOG FOR HAMS AND CBers EVER COMPILED ILLUSTRATIONS COM- I PLETE SPECIFICATIONS ACCESSORIES CURRENT ft LOW PRICES EASY TERMS WRL THE LARGEST Ar MOST PERSONALIZED RA- DIO SUPPLY HOUSE IN THE WORLD BUY ANYTHING ON OUR EASY PURCHASE CREDIT I PLAN SELECTED BEST BUYS ON I - RADIOS, RECORDERS, ETC. SPECIAL PURCHASES FOR I ELECTRONIC BUILDERS 35 EMPLOYED HAMS TO AS-1 SIST YOU WITH YOUR AMA-

Eja

Example showing how 3900 kc is generated. Fig. 2. Example showing how 3900 kc is generated. If your dealer is temporarily out of stock or does not carry Texas Crystals, send us his name along with your order. Minimum order, check or CO.D. is 5.00. Add 5f per crystal for postage, 101 for air math outstanding as evidenced by use in numerous government space projects where there's no compromise with quality, reliability or accuracy. For commercial two-way, ham operation or special...

Zero

See text for explana tion. example just cited and sweep from 100 to 400 mo, At 100 mc, the total line length from point X to load and back to point X is wavelength. When the signal reflects at the load, its phase is shifted 180 degrees, and the half wavelength out-and-back which it must travel adds another half wavelength or 180 degrees to its phase delay. The result is that Er*n and Ef n are in phase, and the voltage at point X is at its peak. When the sweep...

News From The Institute Of Amateur Radio

David Middelton W7ZC, Secretary The success of any group activity depends upon i s membership and leadership IoAR is hound to succeed if a sufficiently large number ol amateurs will accept the Institute's concepts and il' the> will join, work for and with IoAR and support its ideals and ideas. Membership is recruited from the ranks ol all who have a bonafide respect for and sincere interest in amateur radio. IoAR must have a large membership and is seeking them in the vast...

Y

Advised by my lawyers that don't you ever proofread y have no other recourse but should be tarred and feath In response to the article in the November issue of 73 tfLovers Lane by Marianne Lattak, 1 must say that it drew many similarities with a few escapades in hamming here at WA0JHH. When my lovely YL saw the article, she sweetiy told me, told you so, Since then I've learned to keep the rig at home when 1 date. Tom Holland WA0JHE1 Minneapolis, Minnesota Re QST for August, p. 64, Bill Orr's...

Gil

Get your FETs now , clip this coupon, send with check or money order, and be the first in your block to fool with FETs SIUC0N1X INCORPORATED, Ij40 West Evelyn Ave,, Sunnyvale, Calif. 940S6 Enclosed is J For ore U1I0 FET and data 2 for one U112 FET and data 275 for both FETs and data (Caltf. residents add 4 , Sc, or lie safes tax) Get your FETs now , clip this coupon, send with check or money order, and be the first in your block to fool with FETs lion West Fve yn Ave Sunnyvale, Calif 1086...

R E Goodheart Co

Sox 1220-A, Beverly Hills, Collf. 90213 Phone Area 213, tffiee 272-5707t messages 275- 347 IMPE0ANCE BRIDGE Consists of a Weston Electric 14B Rheostat Bridge, Western Electric 2A Fixed Inductor, and a Leeds & Nortbrup Brooks Type Inductometer, Like new condition with manual. JIM.IIU RDR RECEIVER 225 390mc with 1 LSvAC power supply. TCS-13 TRANSMITTER .S- 2wt. Voice or CW, tuneable or Xtaf controlled. Used good. W-JJ SCR-522 100- 156mc Receiver-Transmitter with RA 62 l lbvAO COLLINS PIO, Low...

A M Ph A R L A Mph A R O L Am

And this is the way in which it is done. Five days after the full Moon, five things are to be taken, and they are five stones, each from a place where no sun is to be seen. Then the magician, taking his hat and his shoes in his hands, goes Uj a place where there are high winds, and he calls in a loud voice, st> that the genie may lu ar him. And he calls upon him in these names, **Ampkat Rolat Mphar, Olaml'1 a it is written in the square. I can't help having a strong feeling that a lot of what...

Ac S

Meter, BC-638A, 100 155 mc 19.00 Sig. Gem, M28, 15-26 M.C. & 180-235 mc________24.00 Sig. Gen., 1-130-A, 100-155 M.C 18.00 Wavemeter Osc. 1030, 145-235 M.C 18.00 R C L Scaler, model 3, Mark 13 25.00 Berkeley 1600, counting rate computer 45.00 B.C. 652A Receiver, 2-3.5 & 3.5-6 M.C 15.00 TA-I2 Xmilter, M0, 80, 40, 20 Mtr, 100 watt with M5V. A.C, Power Supply 65.00 B.C. 733-D Receiver 108 110 M.C 18-00 ARC-5 Transmitter for 2 Freq. Shift Adapter, RCA CFA 45 Dual Diversify TBS Xmilter,...

The Astro

Allan Schechner W3YZC Ellis Hersh W3IXL 2466 77th Avenue Philadelphia, Pa, Here's a ten meter mobile transceiver that is small, efficient, inexpensive and rather easy to build. Spare evenings over a three week period were all it took to get it going. Its one watt power level has been sufficient to enable the authors to hold QSO's around the Philadelphia area. The design approach was to make the rig as simple as possible so that the average ham could i et involved with RF transistor circuitry....

Aks

Ffcnltr, nclLi lP p - taEt avg. i it 1 Ib, r VeJ. i.et 3Q flay * RECEIVERS. K5JKX. If you wont to build a receiver or to really understand your receiver, this is the book for you. If covers every aspect of receiving In author Kyles usual thorough manner. 2.00 SIMPLIFIED MATH FOR THE HAMSHACK K8LF1 -Thi* ie the Amplest and easiest to fathom explanation of Ohm's Law, squares, foots, powers, frequency m-ters, logs, slide rules, etc. IF our sdicjots ever got wind of this omaiing method of...

Tubes

Denys Fredrickson W0BMW 3923 East Funston Wichita, Kansas The GDO is one of the most versatile pieces ol test equipment available. Yet there are manv hams who don't know how or when to use one. The writer will try to describe and explain some of its various functions. The GDO is basically a variable high frequency oscillator with a frequency range of approximate ) 550 kc to 250 Mc. It may also be used as a diode detector or wave meter, i he GDO gets its name from the fact that a meter measures...

The Roland Company

NE W YORK,N,Y, 1002 0 As I write this information, lime being 12 30, the Titan JC was a iccess, The Oscar 4 should be in the proper orbit ami ejected now The amateur i ateJlite should have been mined on by 12,08 PST iime+ It is ejected (hat it will be f jrrted over Fquador. The frequencies lfrted in the Sentinel were the ones that ttr iwtc going iri but Ft ill Or t Oscar headquarters) thans d them lo input 144 J OK output center fre< i. 431,972 + 10kc- beacon Ireq,...

Sf Power Supply

Gene Brizendine W4ATE LLS, Army Missile Command Huntsville, Alabama Crystal controlled output at any frequency is possible with this simple frequency-generating system The virtues of crystal control are equally appreciated by the scientist who has had to constantly correct the frequency of an expensive self-excited microwave generator or by the radio amateur who has patiently followed a single-sideband signal, wandering jauntily through the spectrum, in addition to the self-excited oscillators...

Ageradi Electronics Co

Hempstead, NY 11550 Phone 516-1V.-9-0808 Trie writer Model L'1 frequency shift converter designed for two-tone AM or FM with Limiter operation available by switch. Solid fUte ratio corrector compensates lor fading signals. Tc mit amp copying on Mark or Space only. Selector mahnet de loop supply built-in with bias supply and octal socket for optional polar relay to key transmitter. 6W6 keyer tube. Plugin discriminator far 850 cyde or other .shifts. Cathode ray or dual eye...

Hie New Mosley

Two N ew Antennas Customized For 6 amp 10 uiPLOMAT-io di-io Meter Operation ____In creasing numbers of hams are enjoying 10 meters, the up-and coming DX band , , the band for round tables , local emergency nets Mosley s NEW Diplomat-10 for this progress ve bond is a rugged 5 8 wave omi directional vertical antenna rated for 1000 watts features a gain of 3,4 db. over one quarter wave ground plane and 5-9 db. compared to isotropic source, The easy-to-mount, compact features of this antenna make...

Miscellaneous

Power Supply Chassis, 3000 V.CT 300 ma----S 24.00 B.C 433 G Radio Compass Receiver, new 19.00 F.M. Police amp Fire Band Receivers Specify Freq. low or high bond, 1 J5V.AC Crystal Cont 35.00 Teletype 11 tube Receiver, 115 V. A C 18.00 Amplifier chassis, G.E. 6 tube, 25 watt 12.00 A rc.-l, Transmitter Receiver, 2 Mtr. 24.00 Ameco P.S. 3 supply, 600 V. 150 ma., 300V 100 ma 12 V. - 3 Amp. or 6.3 4 Amp. 25.00 Megger, Assoc. Research 218, Portable 15.00 Freq. Meter, 906 D, 150-225 M.C 9.00 OAP...

Superex Ham Headphones

Fall comfort even after many enjoyable hours of continuous use. Superb comfort even for eyeglass wearers. Crisp, distortionless reproduction and high sensitivity allows you to single out that weak signal and hard to reach station, 600 ohms impedance, completely adjustable head harness, PRECISION PLANETARY VERNIER for exceptionally fine tuning Stperb craftsmanship by Jackson Bros, of England. Ball bearing drive. VV dia. Shaft long 6 1 ratio. Vv FB for fine tuning. Easily adaptable to any shaft....

Plug

John Schmid WA6PGA Star Route Uaioma Rood Lompac, California 93436 If you are one of those happy SB-33 or SB-34 owners, chances are that you have regretted, at one time or another, the no-OW feature of your rig. If, on the other hand, you are contemplating the purchase of this little rig, but yon are hesitating because of that same feature hesitate no more The SHE transceiver model 33 can be put to CW use very easily. Less than one evening's work will do it. The Same probably applies to the...

Tristao Towers

Featuring kDD-ASECTION Design Tristao , . , the pioneer name in tower design and manufacture Here is the tower fine that is premium quality, yet realistically priced and designed to enable you to keep adding sections as you grow. A Trisfao Tower is a lifetime investment from your very first section. Besides engineered quality, al towers feature channel lacing and are hot dipped galvanized inside and out. They meet all building code requirements. Motorized models aval lable. Write for FREE...

Sams

Second-Class Radiotelephone license Handbook. New 3rd edition complete study course Tor elements I. II and III of the latest FCC exams. Helps you earn I the License you need for communications and two-way radio work. Order QAN-2, only 3.95 First-Class Radiotelephone License Handbook, By Edward Ar NolL Completely Revised and Updated. Contains questions and answers based on Element IV of the FCC exam ail the information you need to qualify for a 1st Class License, Also provides the essential...

Pulse Generator And Polar Relay Test

Generates perfect 22 in ill second 60 wpm element pulses lor adjusting radroteletypewnter transmitter keyefs, receiving converters, repeaters, etc. for ibto bias. Tests static and dynamic performance and permits precise adjustment of any 215 or 255-type polar relay having ten pin or eight pin two-row, or octal or nova bases. No internal power required. Operates from any loop supply, jectifrer or B battery, capable of supplying 115 lo 130 volts DC at 25 ma. Will mount in standard 19 inch rack...

Mh

This is the schematic of the transmitter described in this article. input into two separate outputs differing in phase by 90 These two outputs are as individual as the two channels of a good stereo system, B amp W rates their unit at 90 1.5 over the audio range of 300 to 3000 cycles per second. The 500 ohm AUDIO PHASING pot across the input to the network will end up adjusted off center by a ratio of 5 to 7, Don't worry, this is he way it is designed to...

Tristao Tower Co

415 E, 5th St. - Hanford, California Richard Van Wickle W TKA 643 Aurora Avenue Santa Barbara, California here are probably many small vibrator power supplies relegated to gathering dust on shelves due to the popularity of transistor mobile supplies. Well, dust off those vibrapacks because here's a way to get more output from them, thanks to silicon rectifiers and the use of a bridge rectifier circuit. Our vibrator supply shown in Fig. 1, rated by the manufacturer at 300 volts at 100 ma,...

Vanguard Labs

Hollts, N.Y. 11423 Back in the October 1964 issue of 73 Magazine, you may have noticed a small ad inserted on page 86 announcing the attempted unloading of mountainside premises somewhere in New Hampshire, complete with a considerable selection of antennas, Within that tempting array, your eye may just have skipped over the fact that it included, and quote, Hy-Gain Tri-Bander for 0-15-10M. Even if you did happen to notice the peculiar specs on that antenna, almost certainly...