Spectacular Transceiver Special

Palo Alto, Calif. No matter how much equipment there is around the ham shack and the experimental laboratory, there always seems to be a need for another audio oscillator for amplifier testing bridge driving, and filter checking* Classical audio source for these purposes is the General Radio Microphone Hummer, which, within its stated limitations, is a most consistent arid satisfactory performer. The writer's instrument, purchased in 1928, finally went to God in...

Call Direct Use Area Code

Butler 1, Missouri 816 679-3127 11240 W. Olympic, Los Angeles. Calif. 213 477-6701 931 N. Euclid, Anaheim, Calif. 714 772-9200 431 E. Green St., Pasadena, Calif. 213 684-0861 6116 N. 27th Ave., Phoenix, Ariz. 602 AM 4-3895 Worlds largest Distributors of Short Wave Receivers The parts listed on the schematic diagram are the ones I used because they happened to be available in the junk box. However, the value of the components used are not too critical, and can easily be substituted if not...

More Lucky Buys

CRT, 600v maximum on deflection plate , flu T Mu-imjt il shield, for abov . or 2AP1 or 2BP1 2.50 Combination oflcr, 9(JliA & 2 mu-metal shield 5.50 CERAMIC MIKK, by American Microphone, push-to-talk switch, 4 conductor curly cord, mounting plate. BRAND NEW 5.00 Curly cord. 5 conductor, I foot, Btretetos to S foot. BRAND NEW 1.29 each, 4 for 4.50 4 mfd, 60 v, dia, long, leads 175 raid, 15 v DC clip type, leads 50 mfd 80 DC. sq * h, GK two on an assembly, easily separated 69t ea., 3...

Sineco Tube Type B

Using a revolutionary filament made from thoriated tungsten-rhenium wire developed by the Rhenium Division of Chase Brass & Copper Company, SINECO tube type 572B is guaranteed to withstand 300g shock loads and operate for more than 2000 hours. Old style thoriated tungsten filament type power triodes exhibit erratic operating lifes from several thousand hours down to only several hundred and have been so fragile they could not be given a shock rating. As the curve below shows, in actual life...

Tennabal

Flat in the amateur bands U.S.A. from 3 to 30 Mcs, Full legal power Fully weather sealed Matches coax to antenna or balanced line, Improves efficiency and rodia tion pattern. Two model*, 1 to 1 or 4 to 1 impedance ratio Size 1V4 QD * 4 Jong. Wt, 4 oz. FUGLE LABS 1835 Watchung Ave., Plainfieitf, NJ. COLLINS MECHANICAL FILTERS F250A-20, 250 Kc Center Freq,, 2 Kc wide at 6 db, 4.3 Kc at 60 db. ideal for SSB. New these filters cost 46.00 each. These are pullouts guaranteed good. Get 'em now. They...

Qll

This voltage and current is maintained with a charging voltage of 14 volts from the alternator. The transformers shown are surplus. There are many similar ones available from the surplus dealers who advertise in 73. A small replacement transformer rated at 350 volts each side of center at 50 ma, 6-3 v at 4 amp and with a 1)5 v primary is used to furnish bias and screen voltages, The 6,3 volt winding becomes the primary and is connected to phase A at the center tap point of this transformer. The...

Equipments

Ferris 32B RF Noise and Field Strength Meter, 16 Kc to 20 Mc. Q-Meter, Boonton I 70A, 30 to 200 Mc. 6R 805C 5ig. Gen, 16Kc to 50 Mc, Exc. Cond. HP 524A 10i Mc. Counter, 6 neon lamp bank readouts and 2 meters John Fluke 101 VAW Meter with 8 Shunts All Equipment FOB and subject to prior

Mission Ham Supplies

16 Moin Street, Riverside 3, Calif. 92501 Attn Bill Hullquist, K6L0S Please Ship me the following enclosed. (Cash orders shipped FREE in contmen QUOTE trade allowance and terms Please send latest HAM flyer, Put me on your mailing list. K ME Call . , Zone . State . (Calif, orders add 4 tax)

Simplified Math For The Hamshack

This is the simplest and easiest to fathom explanation of Ohm's law, square*, roots, powers, frequency meters, logs, slide rules, etc. If our schools ever got wind of this amazing method of undemanding basic math our kids would have a lot fess trouble. 50< CW W6SFM. Anyone can leorn the code. This book, bjMjn expert, lays in a good foundation for later htgh speed CW FREQUENCY MEASURING W0HKF Ever wont to set yourself up to measure frequency righ down to the gnat s eyebrow. An expert...

Info

Of insertion loss in the passband according to Collins' handbook on SSB. Typical shape factor (ratio of bandwidth at 6 db down to that at 60 db down) is 2.2, the closest approach to the ideal 1.0 factor yet realized to date- A typical circuit for use oi this fitter taken from the Collins 32S-1 appears in Kig* 5. Note that in this case the filter is used between two if stages, rather than directly at the output of a balanced modulator. A receiver circuit using the mechanical filter (from the...

Dollar Poly

MICRO-T TRANSISTOR, like TMT-1613. 4 2N35 TRANSISTORS, npa, by'SylvanU* TO 2 . 4 MlCROhh TRANSISTORS, 2N13 1 16, rf 4 CK721 TRANSISTORS, aluminum caftti . . 85 WATT 2N424 PLANAR, siUcon, TO-53 npnt. J 65 WATT 2N1212 PLANAR, drift, lOmc, npn Ht U 1 CONTROLLED SCR SWITCH, Transitron, T018, 1 AMP 1000 voltH RECTIFIERS, axial, lestds. 2 2N721 PNP PLANAR, 2 Tri M f T0 18 3 2N735 NPN MESA, 5 0 0MW. 13 5MC. T -1S . 2- CLAIREX PHOTO ELECTRIC CEU, CL 07 . 1 500MC TRANS'TRS, 2N96 , mesas, pnp, TO I S 10...

A F Lmverter

Fig. 17 Block diagram of circuit of Fig. 16 identifying component functions The same basic circuit was adopted by W9DYV for the 10A exciter. He moved the operating frequency to 9 Mc and added a mixer, thus eliminating the need for realignment with every QSY, Ie also added a number of operating conveniences such as VOX but those are apart from this discussion. The next change of any significance in phasing exciters was introduction of Heath's SB-10 transmitter adapter, designed to accept the rf...

Of Selectronix Filters

WE ADMIT that our photography will never set in dustrial standards, but our filters already have. The heavily overcrowded bands with which today's amateur is confronted has brought about the development of two hiqhty specialized audio filters by Seiectromx Company, Thev are the CLF-401 for CW and the SLF-401 for SSB. The characteristics of these filters have set new industrial standords in several respects Thev have cut-off skirts from six to sixty db, m less than 200 cos. The bandwidth of the...

Ny

Polyphase has developed a new line of 55 standard types of air wound coils for many ham and industrial uses in transmitters, receivers and other equipment. The Polycoils feature special ttfD section supports for minimum power absorption for lower losses and higher O. They are available in lengths up to 10, diameters from W to 3, and pitches from 4 TP to 24 TPL Special larger Polycoils and variable Polycoils with ratings to 15 KW are also available. Write for bulletin CP1001, Polyphase...

A F Amplifier

Ssb Phasing Network

Fig. 1 5 Little Feller audio phasing network Fig. 1 5 Little Feller audio phasing network been reprinted in recent editions of the ARRL Mobile Manual, I he filter, if amplifier, balanced modulator output, and receiving mixer output circuits are shown in Fig. 9, while Fig. 10 is a simplified block diagram of the rig showing how the changeover from transmit to 'receive is accomplished by merely switching B + from one set of tubes to another without disturbing signal-carrying connections except at...

Wau Purpose Balun

- . with built-in lightning arrester center hang-up hook for inverted vees, doublets, etc-, eliminates center insulater broadband 3 to 32 Mc. rated 3 Kw, P.E.P. Two models 1 to 1 Model goes from 50 or 75 ohm UNBALANCED coax, to 50 or 75 ohm BALANCED beam or antenna 1 to 4 model goes from 50 to 75 ohm UNBALANCED coax to 200 or 300 ohm BALANCED load. Also Designed for Quads and Beams W2AU Super Fiberglass Quad 99.95 W2AU Korean Bamboo Quad 54.95 UNADILLA RADIATION PRODUCTS Unadilla N.Y.

Cushcraft

5QUALO a wave, horizontally polarized, omnidirectional antenna. Outstanding all around performance is achieved through a 360 pattern with no deep nulls. The square shape allows full electrical length in compact dimensions. Direct 52 ohm Reddi Match feed provides ease of tuning and broad band coverage- The 6 meter Squalos are completely universal for mounting anywhere. They are packaged with rubber suction cups for car top mounting and a horizontal center support for mast or tower mounting. The...

Special Low Price Only

A fortunate purchase allows us to offer these hiRh in-iced computor grade transistors at such ridiculously ow prices. All are mounted on printed circuit hoards along with assorted components such as resistors, capacitors and a host of other surprises. You pay only for the traiisistors, other parts arc FREE BUY 100 FOR S4.00 or 1000 FOR S35.00 PREPAID NOW TAKE ADVANTAGE Of THIS SPEOAL PRICE SEND YOUR ORDERS TO ALCD LAWRENCE, MASS, if Price 2 per 25 words for non-commercial acU 5 per 25 wards for...

Hyeque Antennafeedline

3-in-1 raided ntastic ntf-metal fitting provide c amp rix feeder connection, heavy copper leads to elements antenna center support. Hye-Que I Connector fits standard PL259. Reinforced, weather protected, ultra-efficient. At your ham stare, or 2.95 ppd, Companion Insulators, 2 for 99e ppdT Includes complete instructions. BUDWIG MFG. CO., P.O, Box 97, Ramona,Calif.92065 As J write Hi is. Dick YA4A W4UTE is at Hie mike operating VA8A Dick is the SSU man nn this trip, and i am CW iVAMIL We arc just...

Iw

From Fig. 2 it can be seen that the lead from the screen of the final to the relay has been removed- It is also necessary to change the screen bypass capacitors from .01 to .001 for AM operation. In the class C position the balanced modulator is unbalanced by the top hall of the switch. The other half of the switch allows the relay to be energized during transmit time, The screen now gets its power through a 40K dropping resistor, I his will cause the screen voltage to be about 130 volts. With...

Tz Ty

A VHF RF amplifier using the 2N3564 is shown in Fig. 3. At 200 mc it has a gain of 4 to IT db. for the best noise figure it should be operated with a collector voltage and current of 6 volts and about 1 milliampere, or for the best gain at 10 volts and about 8 milliamperes. This transistor is a good oscillator up to 1000 mc and has been used in experimental UHF ' V converters. Transistor types 2N3641 and 2N3642 are also useful in ham applications. The 2 N3641 is used as a 400-mi Hi watt-output...

Setting New Standards Ik Sound

Wc cover our bel with a lifetime yuar-amee. If any 6 9 or 71 y ever tails Just send it to us. We'll repair n at nominal cost. But if there's even a him thai our workmanship or materials weren't up to par, the repair is on the house even 30 years fiom no s Fait enough For many years I've had to travel a lot. During ibis time, I've operated mobile with commercial anc home-brew equipment in the 150 watt range and with good results. But I kept wondering how it would he to run a full gallon in the...

International Frequency Meters

Equip your lab or service bench with the finest Discover new operating convenience. FM-5000 FREQUENCY METER 25 MC to 470 MC The FM 5000 is a beat frequency measuring device incorporating a transistor counter circuit, low RF output for receiver checking, transmitter keying circuit, audio oscillator, self contained batteries, plug-in oscillators with heating circuits covering frequencies from 100 kc to 60 mc Stability .00025 to -j-95 .0005 50 to - 100T, .001 32 to 120 F. A separate oscillator...

Tristao Towers

Featuring ADD-A SECTION Design Tristao . , the pioneer name in tower design and monufacfure. Here is the tower line fhat is premium quality, yef realistically priced and designed to enable you to keep adding sections as you grow, A Tristao Tower is a lifetime investment from your very First section. Besides engineered quality, all towefs feature channel lacing and are hot dipped galvanized inside and out. They meet all building code requirement Motorized models available. Write for FREE...

O

-RATED intermittent brief-talk, mobile the new Amperex 8637, a life, radiation-cooled, beam- the new Amperex 8637, a life, radiation-cooled, beam- -RATED intermittent brief-talk, mobile transmitter service, It delivers 72 watts from less than 3 watts drive power under PTTS conditions. Its quality is strictly in keeping mperex standards of excellence and yet it is only a fraction of the size of conventional tubes and costs amplifier, oscillator and frequency-multiplier in communications...

Electronic Research Associates Power Supply

Input IIB VAC 60 cys Output 25.2 VIX U 1 amp, eize , Input 115 V fa 60 ey. Output 135 V 75 nui- size I 2 x 13 164 PRTCE 5 shpt. wt. 5 AERIAL WIRE Reel contains approximately t S feet of pnos-phor broriMe, no. Iii standard. ths tiiat antenna wire. Has KJilvani rd elijis on ends. Brand New, PRICE 150 or 4 for 5.00 sbpt. 3 S-6313 RDZ POWER SUPPLY D.C. power supply mfg. for WARS or RD2 receiver. Input 11 Vi 50 ti0 ry. Output i00 W 200 ma well Altered thru two ti hy 200 ma choke and two 10 mf,...