E

Use a grid dip meter to adjust L4 to 41 MHz, L6 to 25 MHz and L5 to 1.6 MHz for a starter. Tune the be set to a dead spot between be stations near 1.6 MHz. Because of the lack of shielding in this type of be set harmonics of the be set oscillator will be coupled into the 50 MHz converter thru the twisted pair connecting link. With a converter tunning range of 50 to 52 MHz you are bound to get one of those harmonics. By keeping the be set tuned between 1.6 and 1.62 that harmonic should show up...

Info

3U4 Silicon Tuba SI.50 , 5 for 5 66A Silicon Tube .410 , 2 for 18 3U4 Silicon Tuba SI.50 , 5 for 5 66A Silicon Tube .410 , 2 for 18 MICA MTG KIT T036, T03, TOIO, 4 SI ANODIZED T036 INSULATOR . . 5 SI ZENERS I Watt 6 to 200V . ,S0 , 3 2 ZENERS 10 Watt 6 ta 150V 1 , 6 S5 STA BISTOR tip to Ten Watt, 20 for 1 ' TRANSISTORS SCR'S * ZENERS Full Leads Factory Tested & GTD PNPI50 Watt 15 Amp HiPwr T036 Case 2N44I, 442, 277, 278, DS50I Up To 50 VCB0 1 , 7 for 5 2N27S, 443. 74. Up to 80V S2 , 4 for 5...

New Concept In Its Exciting Beam Antenna Program

Any knowledgeable DX'er will tell you the secret is in the antenna. For over a year Henry Radio has provided an exciting beam antenna package program allowing the average amateur to own an efficient, and unbelievably economical antenna package . . . pre-engineered, pre-matched and pre-packaged to suit his pocketbook and requirements. NOW This world famous antenna program moves forward. NOW You can have the antenna of your choice at the same incredible saving. Tristao CZ-337 New concept 40 ft....

Single Band Quads

Model MCQ-10 for 10 meters Model MCQ-15 for 15 meters Model MCQ-20 for 20 meters TRI-BAND QUAD Model MCQ-3B for 10, 15 & 20 meters Designed and Engineered for Superior DX, the new MCQ'S (Mosley Cubical Quads) are rated to 1 kw am and 2 kw P.E.P, SSB. Maximum Front-to-Back and Forward Gain. A Single 52 ohm Line feeds the Quads via a Gamm-a-Match resulting in a low SWR over the full bandwidth. The Square Configuration of the MCQ Series guarantees better performance by providing optimum...

Club Secretaries Note

Club members would do well to get their club secretaries to drop a line to 73 and ask for the special club subscription scheme that we have evolved. This plan not only saves each club member money, it also brings badly needed loot into the club treastlry, if desired. Write Club Finagle, 73 Magazine, Peter Boro Ugh. New Ham Shire 03158. Fig, 1. The Moonbounce Rhombic doesn't require very high towers, the top of it being only 35' in the air. The ends of the antenna are tied to the two end towers...

Q

YOUR TAPE RECORDER IS READY TO TEACH CODE That's right Your tape recorder is ready to help your code study. The CODEMASTER tapes give you professional instruction via your own tape machine. Now generated by digital computer, the CODEMASTER tapes are unsurpassed for timing accuracy. Whether you're just starting, going for your Amateur Extra, or somewhere in between, the CODEMASTER tapes are your best code-learning buy Find your CODEMASTER tape below CM-l For the beginner. A complete course of...

Noise Blanker

Removes interference generated hy auto ignitions, appliances, radars-, and other sources of .1 high energy pulse noise. Spe-citirally designed for VHP opera tor.-s requiring maximum noise suppression for reception of weak DX und scatter signals, Cormcets in the coax between converter and receiver. Ail sclid- srate dcslRU features silicon Field Effect Transistors for reliability and hest cross-modulation characteristics. Specify converter output frequency. Choice of 12-1 , 1110-140. 125-170 VDO...

Vhf Ham Radio Handbook

Amateur Radio Operators Be the 1st in your area to make use of the many VHF-UHF techniques revealed in this new book. Even If you've already taken steps to oscape the crowded lower frequency bands, you'll find much helpful information and many exciting projects which will whet your appetite to so further. Explains the differences between VHF and lower frequency gear propagation phenomena, including tropospheric propagation, effect of the aurora, sporadic E-layer steip, and 6-uieter moon-bou.net...

Subscribers

We want to mate absolutely sure that no one is using our 73 mailing list. We do not rent this list out as do other magazines, If your address label from 73 is distinctive and you find that you are getting any mail addressed, rn the same distinctive way please let us know immediately and send us the envelope or wrapper that you received so we can take appropriate action. Your help in this will be very much appreciated. First Army MARS operators show visitors inside oj van packed with military...

U S Crystals

Refltetometer SWR Bridge w Meter, 30-1000IBC. EX 8.SO BC733F lGS-nDmc Converts to Satellite Recvi EX S.75 TSI019 APM72A 9 Meters 3UP1-CK.T Tests APG30 EX 37.50 T465 ALT7 200W Xmittr lGS-352mc w 2 Gltll's EX 13.50 T-JfiS Schematic pn. X.00 .Complete Manual pp G.50 Test Ximttr Becvr Control Box with Speaker ____EX 6.75 R443 ARNoD S Omc Becvr 11 Tubes 3 Cavities ____EX 4.75 Jones 2 o. 574.23 Micromatch Doubler Coupler ____EX IS.50 C3I86 APS3SB Control Ros with Meter EX 4.50 CIS A.B.C. Type 12...

Xt I

432mhz Uhf Power Transistor Amplifier

Sonoma, Ca. 95476 Frank C. Jones W6AJF 850 Donner Ave. Sonoma, Ca. 95476 The four different 432 MHz amplifiers, shown in the photograph and in the circuit diagrams, were built up on small strips of copper plated plastic board. The purpose was to run a series of tests on different kinds of FET units which might work on 432 MHz. The field effect transistors have come down in price and the three types tested all sold for approximately one dollar each. The three...

Line Tunaverters

Tunable plus Crystal controlled selectable with switch solid state . W converters to change radios into excellent, -t tt - 1 stnsJtivt, selective. THE BEST CALIBRATED 4 1 TUNING Bill DRIFT FREE CRYSTAL CONTROL ruu gt COMPLETE INTERCHANGEABLE CRYSTALS WITHIN BAND 9 volt battery powered. - year guarantee un parts Includes coax, mount amp amp tabor. screws. Size 2 lt 2X3t aX4 4 Inches. New FET transistor oscll- American Made with Anter- Models for AM amp FM Tunable amp Crystal BAND MDDEL COVERS...

Power Source

Fig. 6 Several typical applications of bypass capacitors for separation of ac and dc signals are shown here. At A, the long leads necessary to reach the key contacts in a cathode-keyed CW transmitter are isolated from the rf circuit by a choke, and the rf circuit completed by the bypass. At B, the bypass acts to keep the screen grid at the same rf voltage as the cathode by providing an ac short-circuit, while leaving dc voltage at its normal higher potential. At C, bypasses at each stage...

Vanguard Labs

196-23 Jamaica Ave., Hollis, NY 11423 The TEKRAD Mark V antenna has an enormous capture area compared to quads and yagi antennas . . . really pulls in the weak ones, and you work what you hear Missing DX off the side of the beam The Mark V is omnidirectional so you know where the band is open at any time. Windstorms worry you The Mark V is impervious to wind and will stay up while the quad is going through the neighbor's roof. Like to work all bands Sure you do, and the Mark V will instantly...

Leger Laboratories

Groton 5treet, East Pepperell, Moss. 01437 Phone 617-433-6771 Care and Feeding of a Ham Club III Carole Allen W5NQQ 308 Karen Drive Lafayette, La. 70501 Who needs help with a party, you ask Sure, anybody can have one, but it takes planning if everyone is going to have fun, be it a ball, banquet, or barbecue. The social side of radio clubbing means anything from coffee and cake after the business session to a full scale affair at a ritzy restaurant. Most hams like food, and there's no doubt that...

T No On Amitron T Core

Lower like W1DTY, A 3N128 MOSFET circuit had a slight edge in smaller drift but an order of magnitude greater sensitivity to changes of B versus frequency note double ft regulation in the original article . Caution must he observed during handling and an rf diode is required for class C bias. N channel JFET's tried were Silieonx E103 and Motorola MPF 103 thru 105, the latter being finally chosen. Good load isolation is provided by a FET buffer whose gate series resistor value is varied to...

Prestel Field Strength Meter

Frequency Range 40 to 230 and 470 to 860 Megahertz. Calibrated outword from 10 to 50,000 Microvolts. Nothing makes it easier to properly and speedily find the correct place to install TV, FM and Communication Antennas. You can measure and hear the signals with this 41 2 volt battery economically powered unit. There h nothing else like itt WIRE, WRITE, PHONE COLLECT WE PAY FREIGHT ON ALL PURCHASES 548 Broadway, New York, New York 10012, Phone 212-925-6000 World's BEST BUYS GOV'T. SURPLUS M...

More Johnson Variables

A w, 5 h, is i 114 for Vi shafts. 8 LBS. NEW 4 31.00 9.50 ea. 100-110 2.7 lo l .fl ir, miniature. 3 16 sloMed shaft ____ 4 3.25 79c ea. BEST SELLERS, VERY LUCKY FINDS. LIMITED SUPPLY RF Switch. 2 t ivk. 3 position, 2 pole CERAMIC, double break. I. deck shorting. 1 deck non-shoninc. d a. G lone -r 1 for shaft. I KW-K 3 I-BS . NEW. . 85 KC IF Late type Hl-Q, ceramic form. For lillA. NEW S3 KC IF Older type. hnkeilte form, More METERS. 0-5V DC 0-1 T O MA, basic movement, with Internal 500CI ohro...

ROHN

Meter Omnidirectional Antenna

Box Z000, Peoria, 111., U.S.A. 61601 Phone 309-637-8416 TWX 309-697-1488 310 Quincy Street, Reno, Nevada 89502 P.O.Box 6537, Birmingham, Ala. 35217 Phone 205-841-1789 ROHN, as the largest tower manufacturer in the United States, provides outstanding commercial quality equipment for amateurs. We're best known Robert M. Brown W9HBF 561 I Midciaugh Ave. Downers Grove, IN. 605i5 VHF mobileers claim t's the greatest if you know what you're doing. This article outlines...

Space Electronics

II Summit Ave,, East Paierson, N.J. 07407, 201 791-5050 II Summit Ave,, East Paierson, N.J. 07407, 201 791-5050 RTTV GEAR FOR SALE. List issued monthly, 88 or 44 MHy torroids 5 for 1.50 postpaid. Elliott Buchanan amp Associates, Inc., 1067 Mandana Blvd., Oakland, California 94610. 300G V 3jiF brand new GE Pyronal oil capacitors S3 each. Can mail. 3-lbs each shipping wt., FOB, P. Wandelt, RD 1, Unadilla, New York 1384S. WANTED Military, commercial, surplus Airborne, ground, transmitters,...

Kt-92 Schematics

Lafayette Kt92

Campbell W4KAE 316 Mariemont Drive Lexington, Ky. 40505 Ralph W. Campbell W4KAE 316 Mariemont Drive Lexington, Ky. 40505 AMhTRON HF BEAD CEMENT WITH CLEAR NAIL POLISH, ETC LU2 ARE BIFILAR WOJHD ON TOflOtO CORE IAMI-TRON T-57-I0 - EACH WINDING CONSISTS OF 1 NO. 6 WIRES IN PAHALLEL Fig. 1. Diagram showing all parts and connections. AMhTRON HF BEAD CEMENT WITH CLEAR NAIL POLISH, ETC LU2 ARE BIFILAR WOJHD ON TOflOtO CORE IAMI-TRON T-57-I0 - EACH WINDING CONSISTS OF 1 NO. 6 WIRES IN...