Propagation Products Company

In the interests of making home construction simpler for those readers with anemic junk boxes 73 has gathered together the parts required for building our less complicated projects. These kits are as complete as we can make them, containing good quality parts. Except where the chassis or case is integral to a unit we do not supply it, We will mention when we do supply a case or chassis. We do supply tubes, sockets, condensers, resistors, transformers, connectors, etc. The kits are kept in stock...

Licensing

Even the Directors were hoodwinked to a degree too, though this is their own fault for leaving decisions of this magnitude to the League Officials. One Director wrote to me in confidence that he was opposed to incentive licensing. Rather than go into detail over this aspect of the petition I recommend that you read the two rebuttals to RM-499 that IVe included in this issue. They are both different enough to warrant publication and both make many good points. I am upset over the actual...

New Coaxial Transfer Switch

A DPDT unit internally connected in the de-energi d position, ideal for switching fn and out a power amplifier between an exciter and an antenna. J kw power rating to 500 mc VSWH 1.15 1 to 500 me Isolation fill lib e mc All standard AC and DC coir voltages agitable. DK2-60B with UHF Connectors irs.oo O K 2-60 B-2 C with UHF Connector arid DPDT auxilt-ary contact See your tlenler for catalog sheet or write DK2-60B with UHF Connectors irs.oo O K 2-60 B-2 C with UHF Connector arid DPDT auxilt-ary...

Info

Ease of Operation roller guides between sections assure easy, safe, friction-free raisins and lowering. Strength welded tubular steel sections overlap 3 feet at maximum height for extra s tardiness and strength. Unique R HN raising procedure raises oil sections together uniformly with an equal section overlap at oil heights Versatility designed to support the largest antennae with complete safety and assurance at any height desired Simple Installation install U yourself use either line hase or...

Ohmite Rf Plate Chokes

BRAND NEW 23t each, 4 ffir SL10, 2-1. (early version of Z-50> . W2 uhr P 40 to 120 MC. 25c ea 5 for 1.J0. Z-3. 20 to 40 MC, G long, 39c each, 3 for All orders, except In emergenry or I'm at a hamfest. shipped same day received. For fnu- CnohIK sheet, send self ad-1 ireswiwi stumped envi'lnpo IM.KASlv I'LKASE Include Bliffl-itn for pysiafiB Insurance. Anj txcess reLurned with order. Telephone CAIumet 5-2235 2333 S- Michigon Ave. Chicago 16, lllinofs

Since

We're building our Redline Converters just as fast as we can, but we can possibly get one to you in time to slaughter everyone during the January VHP Sweepstakes. You'll have to take your drubbing from the fetfows who already have their Redlines. There is a possibility that we might be able to get one to you in time for the June VHF contest, unless things get even more hectic than they have al ready. We are building, testing, hounding the devil out of parts suppliers, packing and shipping the...

Transistors Unlimited Company

POST OFFICE BOX 442 GREAT NECK, L I, NEW YORK drive. The heater is designed for 6 or 12 volt operation for mobile operation. Size is small and price is quite reasonable. Tube Division, 230 Duffy, Hicks ville, N. Y. Texas Instruments has a new line of diodes which will have applications for remote tuning, harmonic generators, frequency modulation and frequency control. Capacities range from 22 to 47 m mfd at A volts. Designated XA580-XA589, they will be priced from 7 to 17. Box 5012, Dallas 22,...

Antfnnas Mobile

3- SEP Heliwhip Tuning Without Pruning 18 SP P Dual Antenna System For Mobile A Practical Six Band Ground Plane Simplified 8JK Beam A 2 Band V.H. F, Quad Modification Of The Saturn 6 50 APR Dress Up Home Made Gear 50 APR A Simple Procedure For Makine Ftched Boards SB APR High Efficiency Switching 89 APR Egg Boxes For Parts Storage Tray 102 APR Inexpensive Coax Connector - Adaptor Systun 10 MAY Refiishing Old Power Transformers 16 OCT Whv Fight Ohm's Law 30 OCT A Kit Builders Timer, The Minute...

Sb

I he Heath Company is right in the thick of the heavy current rush to SSB transceivers, their contribution being three one-band models covering 20,40 and 75, The prices of the non-kit transceivers corning out all over the place recently are enough encouragement to get started, finally, in sideband, but what could be more mouth-watering than a picture in a Heath catalog of a sideband transceiver with 200 watts PEP input, and for only 120 Not much. All of which sent me to the order blank in a...

P O

Bill goes on to point out some popular lid-isms such as break-break and gimme a clear channel for a phone patch as proof that we re coming apart at the seams, 1 ie should read some of the Old MarTs stuff in old QSTs. The cry of alarm is as loud today as it was thirty years ago and the little collection of lids go happily on, I dont know where Bill dag up his expert witness for the ham distributors, but we've got one around here who says, Sure, iVe got a few ham customers who can't change a...

Jaffrey

Americas Top Dollar Values in Fully Reconditioned Fully Guaranteed Amateur R amp W TC-120 Transistor supply 500V. 120 watt Central Electronics 20A SSB Exciter amp QT-1 119.00 Central Electronics 20A Rack Mount with QT-1 109.00 Central Electronics 600L linear rack mount 179.00 Central Electronics MM-1 Scope 49.00 CESCO CM-52 SWR Bridge and Indicator 19.00 Clegg 99er 6mtr Tranceiver 99.00 ColHns 75A-1 Receiver amp Speaker 149,00 Collins 75A-4 Receiver amp Speaker 375-00 Collins KWM-2 Tranceiver...

Mc Dual Conversion

Selectivity 6 db 17 KC Sensitivity I micro volt or less for 12 dU s. n ratio. Freq. Stab .0015 from 30 to I.F. Frequencies 9.5 Mc amp 455 KC 6AK5 RF Amplifier 6AK5 High Freq. Mixer 6BA6 Hitfh IF Amplifier 6AU6 Low Freq. Oscillator 6ALF6 Low Frequency Mixer 6AU6 1st Low IF Amplifier 6AU8 2nd Low IF Amplifier 6AU6 First Limiter 6A176 Second Limiter 6AL5 Discriminator Diode 12AX7 Squelch amp Audio AntpL 12AT7 Noise amp Audio Ampi. 6V6CT Audio Output Efii, 12AT7 High Freq. OscTBf Complete with...

Specification Profile

Frequency Coverage 80 through 10 M eight 500 kc, seg ments . Fixed tuned WWV at 10,0 and 15.0 MC 5.0-5,5 NIC auxiliary WWV 5.0 MC . Two general coverage 500 kc segments Selectivity 5 kc. 2,5 kcy0.35 kc. Stability Less than 500 cps warmup drift typically in fess than 5 rninj less than 100 cps thereafter including low to high line variation Sensitivity Vz or better, for 10 db S N on 10 M with LFP and Image Rejection Greater than 60 db Cross Modulation Example Receiving a 10 w signal with 2.5 kc....

University Model Mm Speaker

Completely waterproofed actually submergence-proof speaker. 6 dia.t 16 ohm voice coil, 15 watts. Double-re-entrant type with a built-in, hermetically sealed, permanent -magnet gt dynamic driver unit, Freq. response 300-6000 cps. Wonderful for boats or any outdoor use. Regular price is 43.50. TS-1 53 i AP FIELD STRENGTH METER, Designed to indicate the relative field strength amp freqs of the radiation of transmitters operating within the range of 62 to 72,5 Mcs. May also be used to indicate...

Saxton Products

We also make all sorts of wire products twinlead, coax, open line, etc Send for our catalog b-24 and sec. shielded and adjustable, liey are designed for printed circuit applications and can be tuned from either the top or bottom of the coil is square x high. Fourteen different coils are available, 1.5 uh to 60 mh, 5917 S. Main St., Los Angeles 3 Cah Clegg Laboratories Model 372 low pass filter is designed to work with 52 ohm input and output and give attenuation of less than 0.3 db from dc to...

Cityzonestate

TEL 722-6311 AREA CODE 201 VHF ers, particularly those with the Heath Two Vrs, or those who will be getting Twooers soon and that should cover the field fairly well , should look into the modification kit being offered by Lawrence Engineering, 36 Lawrence Road, Ilamden IS, Conn, I he Twoer transmitter does a fine job, and the only problems fellows find with the unit is the receiver, which, though quite sensitive, blocks easily when too many stations come on the band. Strong...

Plugin Coils

Each plug-in coil has its own dial calibration. jiviiiifthie In four models 8PDT, ti lt DPDT, 3PGT, m Transfer, jiviiiifthie In four models 8PDT, ti lt DPDT, 3PGT, m Transfer, Compression Amplifier Phone Patch iiiiii Tapt Hrmrih-r Patch. Compression Amplifier Phone Patch iiiiii Tapt Hrmrih-r Patch.

FIGURE

Variation in Reflection Factor Over Perfectly-Conducting Ground. operation of an antenna is affected by ground. The proximity of earth to the antenna will modify, to a great extent, t ie directive properties of that antenna. The usual graphic presentation showing the reflection of rf energy from the ground to aid or oppose radiation in a given direction is shown in Fig. 1, The effect of this reflection is often expressed as a factor and normally appears in graphic form as shown in Fig. 2. The...

Surplus Conversions

Transistorised Dynamic Mike Adaptor Like New RAX Use OI Surplus Plug-in Cans In Amateur Construction More Selectivity For The RT-91 ARC-2 Converting The Surplus Antenna Relay TRANSCEIVER A Comparative Survey Ol Transceivers More Selectivity For The RT-91 ARC-S Economical Mobile Transceiver Construction

Master Order Blank

73 Subscriptions Name_ _ _ _____ Call_ 1 yr 4.00__Address___________________ 2 yr 7.00 _____ . City__Zone_ State__Zip.___ 3 yr 10,00- ______Parts Kits Bookshop One year subscriptions LIFE 50.00________ gt page 88 page 90 Sup 2_ New sub._____ Model No, ATV Jl. _ loAR 1_ Renewal sub_______ loAR Membership 1 yr 1__ Start with_____73 Products page 89 _______ Badge. Red_, Black__ page 88 First name _Call_ 1. HOWSIT going to come out Subscribe and see. IF, convenor, switch, audio, HF V1 F PNP, amp...

Wretched Kpmm

One of the big problems at hamfests and club meetings is to have everyone plainly enough marked with their first name and call. All sorts of stickers and pieces of cardboard have been tried, plus little cards which can be typed up and stuck in holders . . . all have the same problem they are hard to read from any distance. The best answers to date are these engraved laminated plastic name badges which can be read by Cousin Weakeyes from seventeen paces. You are in luck. We've arranged to make...

Comaire Lm-6n2c

The LM-6N2 line matchers eliminate the need for inefficient coaxial type transmission lines feeding the VNF system. With the LM-6N2, LOW LOSS balanced feeders can be employed. This will increase transmitter and receiver efficiency by SEVERAL DECIBELS in most installations. Low loss twin line of the open wire or UHF ribbon type, can now be used without the necessity of troublesome baluns and trick matching devices. The LM-6N2 match boxes will work well with any balanced line in the 200-450 ohm...