Heres an easytohandle three band quad made from inexpensive aluminum tubing

As a result of the article in January, 1964 QST indicating that the cubical quad is the top choice among DX'ers, a renewed interest in this proven performer 1ms been generated on the ham bands. Many of you yearn to try the quad and have searched hopefully for a design worth investigation. About the second paragraph of the usual quad article, the words Take it to your friendly neighborhood welder - , leap up from the page to strike you where it hurts. Your neighborhood welder isn't so friendly...

Rear View Of Chassis

Used is a Californio Chassis Company LTC-436. See comments at end of article for some modifications. The chassis and cabinet shown in pictures is a ready made unit by California Chassis Co., Lynwoud, Calif., model LTC436, measures 43T H x 7 W x 9J4 D. Final tank compartment was fabricated from VW' aluminum and measures 4 x x 25b. A perforated cover allows air to escape but shields the rf. The bottom cover is made from Vie aluminum and seals the under side of the chassis to provide a pressurized...

Five Bands Watts

So often when thinking of investing in a mobile rig, the thought occurs that it will have to be a cheap outfit, without many of the excellent features of the home station. Can t afford two rigs like the home station, you say This may be true, but when you have the combination that is designed for the job, the home station can be the mobile station, too, and the changeover simply a matter of moving the transceiver and VFO from the house to the car. The SWAN 400 and its components fit together...

International

Ib no lee dkla. city, okua. 731ds ib no lee dkla. city, okua. 731ds Ive been very surprised at the smallness of the uproar over our adopting the modern hertz for the older term, cycles per second We've only received three letters so far, and two of them end with I lie clever pun, it hertz,1* The tables on this page list the rest of the relevant abbreviations for units from the international system adopted by the NBS, the IEEE, and many U.S. magazines including 73. Most of the changes are minor,...

Tmhsm

Photo courtesy Waters Manufacturing Co* The Waters dummy load -wattmeter is an rf power absorption device with an integral direct reading rf wattmeter. It is rated at 50 watts continuous duty or 1000 watts intermittent over a frequency range of 2 to 230 mc. This commercial dummy toad for 50 ohm lines provides a matched load up to 2,000 mc. be determined by measuring the rate of flow and temperature rise oi the coolant and using the following formula Where P Average power dissipated in gallons...

Info

OUTPUT 550 kc 800 kc 1500 kc 550 kc 800 kc PRICE 19.95 ppd 19.95 ppd 19.95 ppd 19.95 ppd 19.95 ppd 160 M 1600 1,8-2.0 mc 550 kc 24.95 ppd 80 M S00 3,4-4-1 mc 550 kc 24 95 ppd M 750 3.8-4.0 mc 550 kc 24 95 ppd M 400 6.97-7.325 mc 830 kc 24.95 ppd M 200 14,0-14.35 mc 830 kc 24.95 ppd 15 M 150 20.975 22 mc 1500 kc 24.95 ppd Output kits for use with home radios, (state output) 1.25 Watch For New Models Special VHF Model outputs available1 .HERBERT SALCH & CO .Dept. 7, Wdixisboro. Tcxu 7839 TECH...

Repeater

This repeater offers very wide coverage for fixed or mobile. As more stations are moving up into the two meter band, a desire to increase their reliable range has caused many to look toward the repeater as an answer. This is a story of just such a repeater that was built by Air Force MARS people from surplus military and commercial FM equipment, Outmoded FM equipment was used because of the large The transmitting antenna with coax balun as it looks on the 1400 ft, tower also used for KPRC-TV...

Tunaverter

TUNABLE, CALIBRATED solid itate converters fo change your auto and home radios into eitcellenr sensSi ve. sijIgc* five, coMbroted Amateur end VHF receivers 6-1 reduction tuning HF 2 gang fuming VHF* 3 gong tuning1 FH6E 24 conn, coo** 2 WEEK MONEY SACK OFFER BAND Martne Shortwave i WWV time 160 meters 75 meters 3-C & ham, ant. inpvtf

References

Norgrordeti, A Reflectometev for the H-F Band, NRL Reporl 353S 2. L. a McCoy W1ICF, The Hon i match * QST, October 1956 L. G. McCoy, WlICP, The MonimaUh-Mark II ' QST, February 1957 4. A. P. Prescott W8DLD and W. C. Lernen W8WFH, Low-cost RF Wattmeter, GE Ham N ws, May June 1961 5, W. B. Bruene WpTTK, An Inside Fieture of Directional Wattmeters ' QST, April 1959 . DeMaw W1CER, The Varimatcher ' QST, May 7. C. Byler K2HLT, All Band Bahin Coil * GK Ham News, January -February liifiO 8. R. Turrin...

Articles Coming Up In

K1CLL 150 watt Compactron two meter linear W2DXH Zener diodes the complete story K3LNZ Negative cycle loading for you WA6PZR Amateur microwave propagation K6MIO Illumination and parabolic design K6RIL Transistor VFO for VHF or HF SSB W60SA Improved multiplier for 144, 432 and 1296 W1JJL Novice transistor transmitter

Telrex Laboratories

--- With These New Extra-Performance Features Kit SB-301, Amateur Band Receiver, less speaker, - RTTY position on mode switch SB-301 is a fully capable RTTY receiver 15 to 15.5 MHz coverage for WWV reception * Built-in switch-selected ANL Frontpanel switching for control of 6 and Z meter plug-in converters enables complete 80 through 2 meter amateur band coverage * Improved product detector and audio circuitry * Simplified assembly procedure through sub-pack packaging and assembly techniques...

Lafayette Catalog

LAFAYETTE Radio ELECTRONICS Dept. 73 6 P.0, Box 10 Syosset, LJ NX 11791 Send me the FREE 1967 Lafayette Catalog 670 7 from World's Hi Fl amp Electronics Center A battery-operated portable or fixed transceiver Most hams would like to have a completely portable transceiver. Some want to be prepared for emergencies. Some like to mountain -top. Some just like the idea of having a completely independent rig to carry around for special events or picnics. The Lafayette IIA-650 is perfect for these...

O

Fig. h Block diagram of the simple six and two meter bond-switching transmitter with 60 watts output. This article covers he rf section only. The power supply and modulation is left up to the builder. i lie circuit is a simple but very effective design using llie following tube lineup A 6CL6 oscillator VI uses crystals in the 8-9 or 24-27 MHz range and the plate tunes from 23.5 to 27 MHz. Next a 6CL6 multiplier Y-2 either doubles to 50 MHz or triples to 72 MHz. The plate is tuned to 72 MHz on 2...

Clip Make Prom

First, make the antenna as high as the law and your normal travel route permit. Also, mount it up on the back deck of the car where it is out in the clear. You can probably add two feet or so to the regular base section and still not exceed the height limit Up goes the radiation resistance and up goes the efficiency. Now perhaps the efficiency becomes 3 to 5 . The center loading coil has moved up, but that hasn't done any harm-perhaps helped a little. To match the antenna to your 52 ohm feed...

Rrx

AGC to three receivers with a minimum of butchery and without adding tog much to their internal crowding. In one oi them the BFO tube was also used to run the S-meter on phone by adding a couple of transistors seventy-cent transistors, my favorite brand I got a separate S-meter amp with no new socket holes and no extra power drain. I'm happy I did it, in all three cases, The circuit diagram Fig. i shows the AGC, MGC, audio and S-meter circuits of the receiver that had die most done to it. If...

Jgo

Fig. h Left Arrangement of driven elements when using single feedline. Note boom above point where arms cross. Dimensions are AD 1 BD Fig. h Left Arrangement of driven elements when using single feedline. Note boom above point where arms cross. Dimensions are AD 1 BD 8'4, CD 6'2, E 17'8, F V9f G 8'7, Right Exploded view of TV mast clamps used to secure center section of boom and stand-aff insufator to tubing. 8'4, CD 6'2, E 17'8, F V9f G 8'7, Right Exploded view of TV mast clamps used to secure...

Medium Power Load With Heat Dissipating Fins

Construction of broad band coaxial dum my loads. The tapered resistance element of these loads insures that they will provide a matched load up to several thousand megacycles, the stub is short-circuited, it will present an infinite impedance to the balanced voltage. For unbalance voltages, however, the quarter-wave stub is open-circuited at its end so that the points on the dual line at which the stub is attached are short-circuited for unbalanced currents. Therefore, there will be...

Improved Gamma Match

Prior to constructing my homebrew tri-band quad I had concluded I rom on-the-air discussions that a gamma match was a mighty good investment but was somewhat complicated due to problems in waterproofing the large air-gap gamma capacitors. After giving the matter considerable thought, the following relatively simple approach was developed and has been used very successfully at this QTH. Bill Orr's Quad Handbook gives dimensions for gamma rod spacing and length however, in iieu of air-gap...

UHF

Five modefs required to cover this range. Available in 4 I impedance ratio at slightly higher c ieeted end may be grounded and the other end may be connected to a balanced load and be effectively decoupled from lie grounded end. Although this discussion lias assumed the use of regular transmission lines, the two lines can be wound into a coil, either air-wound or ferrite cored. The inductances formed by these windings act as chokes and tend to further isolate the balanced end from the grounded...

W

Although the circuit shows the heaters wired for 12 V operation the builder may do as he Voltages required are as follows 6 V at 5 Amps or 12 V at 2.5 amps and 300 V at 100 mA for exciter section and 500 to 800 volts at 200 mA and - 130 V bias for final Originally the final was wired for self bias but for mobile operation proved to be troublesome and fixed bias tor protection was added later. As shown in pictures the controls are marked with the proper positions for both bands as this...

Hf Voltmeter

Fig. 14, Measuring the balance of the balance to unbalance converter. If the balun is providing an exactly bafanced output, there will be no indication on the voltmeter. mutely 14 mc while retaining the required bandwidth under load conditions. The chiel item of concern in the performance of a balun is the amount of balance that exists on the balanced output line. Tins may be determined by measuring the voltages from each of the balanced conductors to ground. Many high-frequency VTVM s are...

United Transformer Co

DIVISION OF TRW INC. 150 VARICK STRBET. NEW YORK. N Y. 10013 Jack Morgan W0RA Advertising Manager Our cover this month is by Sidney Wtihs of Bennington, N.H, Sid is a well-known artist who specializes in still lifes of objects associated with Old New England he has won a number of gold medals at N,E. Art Shows,

Johnson Kw Matchbox

Tvi Filter Connection

Hand, it is possible to employ filters that have a cutoff frequency at 53 nic i iese filters don't have as much attenuation on channel 2 as do those with a cutoff frequency of 4o mc, but they will eliminate many cases of television interference. However, since the cutoff frequency is so close to the operating frequency, elective low pass filters for six meters will not handle a full kilowatt with realistically sized components moist are limited to approximately 200 watts. Although low pass...

Delta Mark Ten Capacitive Discharge Ignition System

Enjoy dramatically improved acceleration eliminate plug fouling and the effects of point bounce. Get better gas mileage and instant starts. Installs in ten minutes utilizing original coiL Utterly reliable and fully warranted. Not to be confused with earlier 'transistor ignition systems.M Postage Paid gt St vd check with order fo . . Broadway at Jefferson Fort Wayne, indiana 46802

Magazine

Dummy Load Gentec

The Gentec dummy antennas are hermetically iealed nanreactive loads designed for use from jc to 250 mc. The Model 525 on the left will dissipate 250 watts ICAS the hrgher power Model 310U on the right will handle 1000 watts ICAS, oads are furnished with type t'HF oonnec-ors, but the model 510 is available with either UHF, X, or BNC fittings. For low rower applications, the Gentec model 507 50 ohms and 707 70 ohms exhibit an WR of less than 1.05 1 from dc to over 250 mc and have a continuous...

Take the VT out of VTVM with the transistor that behaves like a tube

SHiconix assumes no rL'spuiisibiliiy for ciicurls shown,, nor docs 1 represent or warrant that t ey do not infringe any pjtents. SHiconix assumes no rL'spuiisibiliiy for ciicurls shown,, nor docs 1 represent or warrant that t ey do not infringe any pjtents. 'he voltage divider on the left works with both in the middle circuit, the matched FET pair means no re-zeroing with temperature changes. If you're willing to re-zero try the one on the right. Either circuit with a 100 a meter gives a full...

Barker And Williamson 590g Antenna Switch

Barker Williamson Balun

Th e position set ctofi switch qow-key dkt8-3 two position selectop swItch aa 550A-2 DOW'KET 0 78-2 WATERS pc Fig. 5. Switch contact arrangements o commercial coaxial switches. Fig, 6, A typical coaxial switching arrangement, with ail the coaxial switching requirements of a ham station being accomplished with coaxial switches. This arrangement is much handier than screwing and unscrewing fittings every time you want to change o cable. Several Barker and Williamson coaxial switches. Clockwise...