Lgz

A)Antenna checked in a grounded state. B)Antenna checked in a non-grounded state. one at a time. If this affects transmitter loading appreciable (more than five or ten percent change in final plate current) check the unused antenna further by touching a neon bulb to the end of the shorted feed line in the shack. If the bulb lights, it is an indication that the antenna system is absorbing power as a half wave antenna and should be grounded to move the resonant frequency out of the band....

Magazine

Features 6 An Approach to Six-Meier SSB WA1FRJ Using an NCX-3 or other SSB transceiver. 2 d*W2NSD 1 14 IF Notch 4 Leakv Lines por the last word in selectivity for your transceiver. 65 Reliance Check _ _ ., . . 70 Letters 18 Calibrate That Homebrew Dial K9STH 81 Chokes or Coifc Accurate calibrations on any band, S3 Ham Hospitality 20 Slow Scan Color Pictures WA2EMC 97 Keyboards for Keyers Usi addit ve synthesis. 121 Clock Modification 22 A Remote VFO for the HW32A AP2MR T25 Antenna Fishing Split...

Letters

First of all 1 want to tell you how much I support your idea of a magazine that would be for Novices, SWL's and CB'ers. You see, I'm only 12 and havcift quite got my Novice yet (I hope to soon). But I would mainly like to ask you about this I support Barry Goldwaters Senate Joint Resolution 27 as do many others. As you know, this bill would allow immigrant radio amateurs (permanent residence ones) to apply for a W license, Steve Antosh 1524 North Oklahoma Avenue Shawnee, OK 74801 Readers et...

Wpha Global Import Co

With the base vol age zero the collector current of Q3 will also be zero causing RR1 to open- Before proceeding to the dot sequence, I would like to explain the reed relay and my reason for using it. The construction is simple two iron strips, gold plated, held in close pioximity in a glass tube in a vacuum-Surrounding this glass tube is a coil of wireSimple, isn't it (Fig. 3.) When the coil is excited, the contacts act as an armature and close upon becoming...

Out

Since this is the only tube I have found to possess enough transconductance to develop the required voltage at the grid of the driver, The mixer and driver plate coils are tapped to arrive at a better L C ratio and improve efficiency. Tube input capacities are too large at these frequencies to permit coupling directly across a tank circuit and still maintain good voltage gain. For example, the total input capacity to the final amplifier is 60 pf. Figure the size of the tank coil to resonate...

For The Do It Yourself

ADO AUDIO & CABINET & YOU HAVE COMPLETE JUKE-BOX Interesting facts about the MODEL TD-ASM. Complete 80 selection 7 inch disc changer. Supplied with duai diamond stylij lift-out record rack, 30 shielded lead & phono connector, AC cord & plug. SIZE I9W x 17D x 1 (V'H. 117 VAC 40 watts, Slipg, Wt, 1 8 lbs. Here's your chance to give the XYL and kids a really unique Christmas present - a completely automatic, Swiss-made miniature juke box. This amazing 45rpm unit plays 40 (yes 40 )...

Vdc

Complete schematic of sextupier power supply* with excellent results. The value of RIO may have to be changed to drop tlie voltage on the low voltage tap to give the correct amount for your particular brand of transceiver. The light weight, 5 Vi pounds, and good voltage regulation make this type of supply an excellent choice for the modern day, compact SSB transceivers on the ham market today. And the cost isn't too bad. Purchasing all of the parts new, this supply can be duplicated for...

Converter

144-146 MHx In. 28*30 MHz out or 146-148 MHz with a second crystal A full description of this fantastic converter would fill this pa e, but you can take our word for it or those of hundreds of satisfied users) that it's the best. The reason is simple we use three RCA dual Rate MOSFETs, one bipolar, and 3 diodes in the best circuit ever. Still not con vinced Then send for our free catalog and get the full description, plus photos and even the schematic. Can't wait Then send us a postal money...

Wate Rtown

Joe Eschmannt K9MLD 2036 Erie Street J acme Wisconsin 53402 If you are a CW man iike 1 am and have in your possession, as my wife puts it, a rather oversize junk box occupying one bedroom and 50 of the basement, you will appreciate putting these parts to good use. I am an avid 40 meter operator, and while on the air one Saturday morning 1 couldn't help noticing ag gt in the increasing number of automatic keys or keyers. Well, 1 looked at my wallet and then at my rather large junk box and...

T

17,467 57.958 37,668 105,132 48,873 9.520 3.452 88O 281 .000 Reprinted with permission of Radio Amateur Callbook Magazine, from the Fall 1969 issue. Having spent some time getting my feet wet on six meter AM, I developed an urge to join the sidewinders7' down on the low end. According to my way of thinking, a commercial six meter SSB transceiver was out because I did not care to spend so much on one band. The transverter approach was also discarded since I did not want to disturb my low band...

Noise With Signal

Fig. 1 Comparison of conventional AM and SSB for equal carrier strength, showing power spectrum of transmitted signal, signal envelope as transmitted, waveform recovered at receiver, and noise accompanying received signal. A comparison of the power distribution in the signals produced at the transmitter, recovered at the receiver, and the final signal-to-noise ratio appears in Fig. 1. The top pair of illustrations in Fig. I shows the power spectrum for AM, at left, and SSB, at right, drawn for...

Kuaw

Anthony Sperduti WB2MPZ 4740 Newton Road Hamburg NY 14075 I have been operating the Swan 350 Transceiver for a year and a half and outside of a few bugs and minor breakdowns, think that it is a very versatile and dependable rig. Bui 1 missed having Vox, a crystal calibrator and selective sidebands. Swan did make the TCU Transmitter Central Unit for the Swan 240 Tri Band 80-40-20 Transceiver. The TCU includes these goodies plus j built-in speaker, but unfortunately does not have a side-band...

Band Watt

This photo should be compared with Fig.3 to get an idea of the layout. Top view of the chassis. This photo should be compared with Fig.3 to get an idea of the layout. assumption involved here is that since PTT or VOX operation is involved, the carrier will be applied .with modulation in which case 100 modulation the efficiency will be about the same as with SSB, There is something to be said for these low cost TV sweep tubes in AB1 linear operation. 6I46B's could have...

Miniature Af Generator

Thanks to transistors and printed circuits you can hold- this complete Jab in one hand. Not long ago this would have been a whole shelf fui of test equipment, 455 khz generator for aligning if's, 400 hz generator for audio circuits. Plus a normal VOM and R amp C substitution. Field Strength meter for tuning transmitters. Everything in one small box Model SE-400 Mini-Lab ONLY 25.00 Mtni-AF Generator for the laboratory or ham work bench. 10 to 100,000 hz in four bands sine or square wave. World's...

Apollo TV Radio

The television camera used on the lunar surface during Apollo 11 and also on the Apollo manned flights prior to Apollo 10, was a black and white monochrome RCA slow-scan camera with a 320 line horizontal, 10 frame per second vertical format, fhe color television camera used in the Command Module of Apollo 1 1 and Apollo 10 was a three-color wheel Westinghouse camera with a commercial format of 5 25 lines and 30 frames per second. The three colors are transmitted sequentially, recorded at the...

Info

Using equation 5, Vb is determined, Vb Vbe IcR The 0.6 volts came from the fact that the transistor is silicon, and Vbe is 0.6. Now that we have Vb, RI can be found in equation 9. R1 Rb .g K 2 f3V v Sts 6.85 K p _ Rl Vb 6.85KX2.63 volts 0 v Vcc - Vb 22.5 - 2.63 volts yiK Well, there you are. The values can now be applied to Fig, 1 and we have an amplifier. However, you may have some trouble finding all the precise resistor values aL your neighborhood electronics store. I picked the closest...

United Radio Company

56-A FERRY STREET NEWARK, NEW JERSEY 07105 RG 196 AU 50 ohm Tefton coe gt c ol cable Outiide diameter 080 RF loss 29 db par foot at 400 Mh . Sifver plated lading and conductor. Uku for internal che n wiring, amennn coupling, RF coupling between nag , etc. Random length from 35 foot to 150 foot Colors black, red, brown, bkje. tfrey. orange, Regular price' 234 per foot. Our price 4 per foot 3.00 per 100ft 456 Khz ceramic filters type SF -455-A. These filter wilt help to sharpen the wiectFvity of...

After Modifications

Circuit board modifications, of 150 khz without any noticeable degradation in the signal strength. Apart from the flexibility of being able to work split frequency or transceive, the remote vfo makes it possible to use the whole band from 14.00 to 14.35 mhz as against the 150 khz allowed by the HW32A. It might be necessary to re-calibrate the FIW32A vfo by decreasing the vfo trimmer CI318 capacitance a little. Even if it is not done, the capacitance introduced by the remote vfo does not...

Broadband Coverage

Drumeller, W5 JJ 5824 N.W. 58th Street The matter of just how well a transmission line transfers power from a radio transmitter to a load, when that load is not matched to the transmission line, has been debated for many years. Few people feel certain that they know just what occurs. The amazing part of it is that very few radio amateurs have ta en the trouble to set up a carefully controlled experiment to determine empirically the facts of the situation. To settle this question, I...

Bibliography

References for additional information on SSB Single-Sideband Communications Handbook, Harry D. Hooton W6YTH, published by Howard W. Sams Co., Indianapolis, 1962. Fundamentals of Single Side Band, Collins Radio Company, publication 597 0331 00, 1959 may be difficult to obtain but contains extensive discussion of SSB principles, linear amplifier design, and mixer considerations aimed principally at commercial users . Single Sideband for the Radio Amateur, Publication No, 20 of The Radio Amateur's...

Free Phasing Harness

Phasing Harness

Glen Zook K9STH 5 8 3 Brentwood Lane Richardson TX 75080 Whenever a new piece of homebrew gear is finished, it is often necessary to give a degree of reliability and resettability. However, the necessary laboratory equipment is not available to the majority of amateurs. Thus, makeshift methods are often attempted with a makeshift result. Although a simple method of achieving reliable calibration is available, many amateurs are not aware of it, or have forgotten how to use the method. Older...

Current Used Gear List

Ameco CMA all band converter 160 thru 2. Less crystals Collins 32V2 transmitter Collins 62S1 6 amp 2 meter trnsvrtr Collins 75A2A with both 3 amp 6 kc filters amp matching speaker Collins 75S 1 Rcvr. w wts rjtn. tuning Drake 2A with matching speaker Eico 752 DC mobile power suppty Hallicrafters HT30 SSB AM CW xmtr. Hallicrafters HT32 SSB AM CW xmtr. Hallicrafters SR42 meter transceiver Harnmarfund HG170A-VHF all bands 160 thru 2 Heath HW12 75 meter transceiver Heath HP13 DC mobile supply Heath...

Vac Input

CI to 3--01uf 200V Capacitor C4 .1uf 200V Capacitor C5-02uf 100V Capacitor D1-MPT28, 3 Layer Diode Motorola D2 MAC2-4, 200V Triac Motorola Fl-10 Amp Fuse L1-NE51H Neon Lamp and Socket R1-56K, 1 2 Watt 10 Resistor R2-150K Pot, Lint Taper, 1 2 Watt R3-4.7K, 1 2 Watt 10 SWt-SPST Switch, 10A Misc.-Line Cord, Terminal Strip and Chassis, Fig, 1. Electronic Vanac schematic. CI to 3--01uf 200V Capacitor C4 .1uf 200V Capacitor C5-02uf 100V Capacitor D1-MPT28, 3 Layer...

Tunaverter S

Tunaverter

EASY Installation and 100 American made dependability Crystal 8r Tunable V the fhp of a switch It s getting TWO converters for the pr ce of ONE Extra Sensitivity SeE ciivity with unique 3 gang tuning capacitor It is signal peaker on crystal control Changeable Crystals tor Versatility amp Usability, Change channels al will Never obsolete1 SauRlch built in for NOISE FREE monitoring 2 WEEK MONE Y BA CK GUAR AN TEE 12 volt powered 1 year guarantee Includes coax, mount Size 2 V'x3V'x4 V 6 t Gang...

Part II

Aelectronic

Richard Zach WB2AEB 33 Pike Place RFD 4 MahopacNY 10541 As stated earlier, 75 of all FM activity is operated from the mobile. Fortunately, mobile equipment is easiest to come by and is less expensive than a base station. Again, when you purchase these units, they come with all accessories transmitter, receiver, power supply, control head, speaker, mike and cables. Most two-meter rigs have to be converted from the adjacent 150-174 mhz Business Band down to the high end of 146 mhz. All this...

Sb

Lynch W4MNW 113 Robinhood Avenue Titusville, FL 32780 When the time came to purchase a SSB transceiver, the SB-33 was chosen. It is compact, solid state and the price had just been reduced when the new SB-34 was released. After several months of operating it was decided lo try to improve the performance and increase the flexibility of the transceiver. The first item added was a 100 khz calibrator, shown in Fig. 1. The crystal oscillator was taken from an earlier GE transistor manual, but...

Dual Gate Mosfet

To 300 MHz, 23.95 ppd. to 400 MHz. 27.95 ppd, to 450 MHz, 31 95 ppd. AvailabU from S MHi, to 450 MHi. Bandwidth it approximately 3 of frequency. Voltage oaln 30 to 40 DB depending on frequency, Two Dual Gat MOSFET amplifier stages with each having a tuned Input and tuned output. Each Dual Gate MOSFET Is actually an integrated cascode circuit thus giving you 2 caicode circuits equivalent to 4 triodes. Exceptionally low noise 2.5 DB at l75MHi. t great-fy reduced cross modulation and 0 timet the...