Band

Bill Turner WAQABl Five Chestnut Court St. Peters MO 63376 Early February has been most unusual, There have been multiple E openings in many areas. Openings of this type and frequency are not normally expected until the beginning of the summer E season. The band has been open at least eight times during the first twelve days of the month. Areas heard include Maryland (WA3PNQJ to Florida and Louisiana (WA5UUD) in the south andl west to New Mexico (W5TDZI and Arizona (WA7FP0). I had a nice QSO...

Sral

Two inquiries well over a month apart were made to the address the I.A.R.U. supplied as the authorities for reciprocal licensing matters. No reply was ever received, Perhaps the inquiry has to be made in French In any case, it does not matter much as there are no known 2 meter repeaters in operation n France. For those who would like to try their luck in contacting the telecommunications authorities, the address is Direction des Services Radio Electriques 5 Rue Froidevaux Paris 14, France The...

Dx Representatives

BCN Agencies Pty, Ltd. 178 Coilins Street Melbourne 3(300, Victoria Australia The Wireless institute of Australia 478 Victoria Parade P.O. Box 36 Carlos Rohden Caixa Posal 5004 Sao Paulo, S.P. Brasi Jim Coote 56, Dinsdale Avenue Kings Estate Wallsend Radio Society of Great Britain 35 Doughty Street London WC1N 2AE, England Short Wave Magazine 55 Victoria Street London, SW1, England Irish Radio Transmitters Society 9 Wellington Street, Dun Laioghaire, Eire Sun Electron Corporation 15-20...

Waller Electronics Test Equipment Sales

Box 9913, Chevy Chase, Md. 20015 The ' TESCO-PAO has no tuned coils to go off frequency, no tuning necessary or even there it's all in one Black Box LC. ready to go. The TESCQ-PAD has a 1 second hold-up for your transmitter, complete P.T.T, operation, available with dual audio output levels, 12 or 16 tone combinations. (Add 100 for 16 tone version) ( 2.00 m -m - m msm m mi -v (Add 1-00 for postage and handling.) NOW BRUTE FORCE IN A 12V BENCH SUPPLY - THE WALLER 60 AMP 12 VOLT SUPPLY A...

Power Supply

Parts ICXt QX and RX which are not shown in Fig. 3 were added for additional switching. These parts are not required for the standard scanner. Some parts on the schematic are not on this board due to the use of a non-standard IC1. Q3 was mounted sideways in a field replacement of a defective transistor. Interconnecting wiring is on the bottom of the pc board. Here is the completed scanning adaptor as it appears mounted next to its dual voltage power supply. See Fig. 6 for...

Communications Corp

213 775-6284 639 North Marine Avenue. Wilmington. California 90744 The RCA insulated and protected dualgate metallic oxide semiconductor field effect transistor type 40841 is quite a device. I don't work for RCA but I am quite fond of their products as you can gather. This device has up to 32 dB gain as an rt amplifier at 44 MHz and is useful up to 500 MHz without neutralization. It also features a low noise figure. In the courst of using them in the rf and mixer stages of a two meter FM...

Getting Rich In Amateur Radio

Outside of going on commercial DXpeditions or publishing lucrative ham radio magazines, the main way to make amateur radio pay off is by getting into the manufacturing end. Before you make that down payment on a new yacht, you will have to decide what marvelous product you are going to make and be back ordered on for the next few years. Five kilowatt linear amplifiers might be a good item, except that the CBers would take all you could possibly afford to make and you wouldn't be able to even...

Us Amateur

3.500- 3.775 7.000- 7.150 14.000 14.200 21.000 21.250 28.000-23,500 50,000 50.100 3.775 7 150 14.200 21*250 38,500 50.100 3.500- 3.775 7.000- 7.150 14.000 14.200 21.000 21.250 28.000-23,500 50,000 50.100 3.525- 3.775 7,025 7.150 1 4,025 14.200 21.025 21,250 28.000-23.500 50.000-50,100 3.525- 3.775 7.025- 7.150 14.025 14.200 21.025 21.250 28.000-23.500 3.700- 3.750 7.100- 7.150 21J 00 21.200 28.100 28.200 3.775 7 150 14.200 21*250 38,500 50.100 4.000 7,300 14.350 21.450 29.700 54.000 3.800-...

Two Meters

MOTOROLA V53AAB - ONE OF A KIND - indoor cabinet contains 60 watt 2 frequency transmitter, heavy duty bJower for cooting of final and driver stages, receiver fully shielded for repeater use, line terminational panei with 2 freq. relay, AC power supply for 60 watt transmitter & receiver, metering panel, smgte tone decoder, 30 watt transmitter and AC supply. Add crystals and be an the air with your own repeater. The first check or money order will take this foi only 350,00 MOTOROLA L53GAB 60...

Ic Ic

On the NEW IC-22 . you'll get. . . 22 Channel Unit for just 289.00 . 5 channels supplied . large buili-in speaker . separate light indicators on squelch break & Xmitl . quick release mobile mount included . green back lighting on front panel super compact - , . 23 32,,X6,,X8, i,, 4,5 lbs, . matching regulated, filtered ac supply available. Cross channel interference is virtually eliminated with 5 helical resonators in the RF amplifier coupled with 2 Lf* filters to virtually eliminate...

Vdc Power

Use as power pak for mobile riff & many Hiim com )o neuts, other electronic projects. Size B Va tall x 4 w i d e overall x. 2 . Shipped dry, must he filled before use. + Compact Needs only Electrolytic 'HAM' UHF 400 MC HIGH POWER ill TRANSISTORS By RCA or eqnal 2N36S2, NPN. 23 watts, 3 am TO-60 t'aspj with stud mtg VCEV max 65. SN7403 Jga SN7404 g*B SN740S Sin SN7406 SN7407 SN7438 .51 5 5N7*40 .25 0 SN7441 1.30 SN7442 1 13 f SN7443 1.21 I SN7444 1.21 I SN7445 1.50 SN7454 .25 0 SN74S5 .25...

The Rca Cmu Fm Transceiver

The RCA CMU 15 450 transceiver is one of the most common rigs available recently from the commercial surplus market, and is probably the best buy. They are commonly available for less than 20 complete, and their reliability and stability are superior to other rigs of similar age. However, retired equipment is generally not found in good condition, and will require service as well as alignment. To the amateur with limited experience and test equipment, getting one of these monsters to work on...

Integrated Circuit Sockets

16-Pin, dual in line . . ,SO S TO 5, a or IP pm amp . . . GUARANTEED FACrOttY tC amp Tt 531 Hi blew rate op-amp TO S - 532 Micro power 741 lt TO-5 gt 533 Micro power 709 TO-S 537 Precision 741 TO-5 . 540 70W pwr driver amp TO'SJ . S 0 Precision 723 voltage reg, DIP SSS Timer 2 uSeconds to 1-hr A 556 5 Times faster than 741C 558 Dual 741 mini DIP I 1 560 Phase Fock loops DIP , Li 561 Phase lock loops DIP S62 Phase loch loops PIP 565 Phase Jock loops A - - 0 566 Function generator lAJ 567 Tone...

Cei Standard Time Receiver

Group had been looking for an easy way to have time announcements on the repeater. We wanted an automatic unit that would announce local time. However, the only unit we could find was a receiver with a built in recording that would announce the time when a button was depressed. The unit cost a staggering Si50 and it was subject to error should power fail. A quick telephone call to Hamtronics in Trevose, Penn. gained us the new Caringella STR-1. It s a three channel solid state receiver for 5,...

Aid

The need for better tuneup aids for CH radios has been well documented by W2NSD I, See 73 Feb. gt 73, pages 5 and 6. Well, FELLOW AMATEURS, I must admit lo holding out on you, just a bit. I have been in possession of an excellent circuit for such a need for about seven years. I recently updated it with a more modern transistor and a Printed Circuit Board, A comment here, to explain that 1 also hold a First Class Radiotelephone License, and on occasion repair CB radios. Also remember that no...

Repeater Tome Panel

ALPHA announces its new R CP 780 multi-frequency repeater tone panel for use on community repeater systems, shared base station New from Radio Shack is The Realistic Phone Patch at a price which brings this useful accessory within the reach of any ham's budget. The Phone Patch is priced at 19.95 and comes complete with 15 foot telephone leads, three foot transmitter lead and installation instructions. It features a built-in VU meter, gain control and locking push-totalk bar. It is available at...

April Mcmlxxiii

Last February radio and television shows were interrupted with a terse announcement that a plane had crashed into an Alameda CA apartment house. Details were so sketchy as to be non-existent. By 11 p.m. the news reported a Navy jet had screamed into a three-story building with the possibility that none of the occupants had escapedthat dozens may have perished. Alert to the possible need by the American National Red Cross for emergency communications was Charlie Weber WA6RPK, a member of 'The...

L

For the photo enthusiast, electronic industry, people cooler, etc. Brand new assembly made by HOWARD Industries, 3 fans per panel, 115 volt 60 cycle. Each fan good for 100 cfm and have blade guards both sides of each fan. To reverse flow of air, mount panel backwards. All brand new, ready to use. Silver gray panel finish. Standard 19 inch panel, 5 1 4 inches high, S12 per panel of 3 fans or 2 panels of 6 fans for only 20. Ship wgt 7 lbs per panel, Surplus from DELMONICO RADfO Co. Made for...

Or Thru Your Favorjte Distributor

Crystal change and 1 was talking to K4YMB through the Huntsville repeater. After a short chat, i took a couple of deep breaths from the oxygen cannisler and switched to 16-76, Fortunately there wasn't too much activity, and 1 was able to hear WA90RC in Chicago with a full quieting signal. When I tried to call in, however, I keyed up a multitude of stronger 16-76 repeaters. 52 simplex proved rewarding with contacts to South Carolina, West Virginia, Tennessee and Canada made with ease. After...

Revisited

I made a modification to the International Signal 100 mW rig that will be of interest lo anyone who has one and would like to improve the power output. Several members of the Naval Postgraduate School Radio Club have made this modification and no one has experienced any trouble. The problem of the final blowing out at high voltage levels was the thing that got me to looking for a replacement thai would stand more dissipation and get greater power out with the drive available from the board....

Even Segment Indicator

Scan-Inhibit line to manually select a channel. The channels are scanned when no ground is on the Inhibit line. Many methods are available for reading out the received frequency. In all cases the BCD format must be decoded to the desired output, in Fig, 3a, a BCD to seven segment decoder-driver operates a Numitron or similar seven segment readout device. This will indicate zero th rough seven. A BCD to Nixie decoder-driver could drive a Nixie tube to read one through eight. Alternately a BCD to...

Meter Aircraft Monitor

R 74S TRC-47 single channel AM crystal con trolled 110V 60CPS, pwr supply amp speaker built In, squelch, r-f gain, dual conversion modern design. Size 19' W x 5H x 14D for rack rntg Supplied with schematic amp hookup info. No conversion required, Exl condition 70-100Mc. Single channel. 50 W. output. 110 V, 60 cycle. New and like new. R-19 TRC1 Receiver 49.50 T-14 TRC-1 Transmitter 49.50 FREE schematics. Convertible to 6 or 2 meters, 190-550KC Q-5f r Good Condition Recvr 14,95 or like New...

Transceiver

Well I see thai good old summertime is around the corner, this means there will be some changes in the bands, and best of all the WX will be right to get your antennas right I t had a very FB looking 4 element, tn band quad, ail put together, boom, elements and all It was just tied down to the bottom of my 150 ft. tower, just high enough to clear the ground, I was trying to get it put on top of my tower and winter WX and a lot of rain and wind stopped me and then it turned cold and winter was...

Part Ii

2n5590 Circuits

Figures 2 and 3 depict the two forms of the I network input resistance less than output resistance and input resistance greater output resistance, respectively. And Fig. 4 depicts the pi network. None of the equations governing these networks are overly complicated. Nevertheless, using them to design the input and output lank circuits of a practical rf amplifier does require quite a few calculations of little interest to readers not ma thmaticaiiy inclined. For con-ventence therelore, we have...

Cod

Rca Valve Amateur Transmitter Schematic

M U PlujUI liiMirancc special O hli r-r ftilli lliyt m-vi .-,11'in all lt hipni i1s wil be F.fMJ. dc l naU tt, via Kjrol iila. f r 1 S your cIkVh pK l h w arEr i itdkidr tdti piTi , h nd ijig and iLiumirt, Missonti RESJ l K-NTS add Hd is . P O. BOX 773 COLUMBIA. MISSOURI 65701 TWKP10-760A PHONE 314 443 3673 COM TR ON Model 960A DC Mobile Unit New as-is. Complete 129.00 This unit is all solid state except the driver and final output tubes which are instant heating. Unit is 150MHz Front Mount...

Q N

2n5591 Amp

1.5 cm long C1 to 4-40 pF ARCO 403 C2 - 7-100 pF I ARCO 423 RFCt - 2 T no. IB, 0,7 cm I.D., plus ferrite bead RFC2 - 3T inside 6 hole 200 MHz ferrite bead Fi'gr, Fu J size PC board Jayoui copper side for the 6 watt amplifier, happened to he in my junk box . The other change is the transistor, Q2. It is a Motorola 2N3925 which I chose for several reasons 1 It isn't too expensive 5,35 in single quantities , 2 It is easy to mount and work with, and 3 It can put out 6 to 7 watts with 1.4 1.6 watts...

Appendix Equations

Output resistance of an rf power amplifier Where Ro output resistance in ohms. Vcc dc collector voltage. Vmin minimum instantaneous collector voltage. And Po power output in watts. Vmin is approximately 2 volts for most rf power transistors. It is often ignored in routine calculations, L network equations A Input resistance less than output Xc Routi Rin Rout - Rin 2 B Input resistance greater than output Pi network equations Xcin Rin Q 8 Rout Rin Rout Q2 1 - Kin Rout 9 XI Qx Rin Rin x Rout Xc2...

Superex Headphones

Imow you too can get automatic accurate time announcements from your repeater. The WA1KGO repeater A new low priced set at sieitiu headphones is being offered to the ham market by Superex. For 19 95 you can forget those heavy uncomfortable cans and sit beneath something with a designed-in comfort factor. Although the frequency response of stereo phones isn't by a long shot tailored for voice communications, most modern receivers have bandwidth filters and shaped audio sections that limit audio...

Oiode

Circuit with automatic reset Fig. 1. Basic circuit of the lightning detector. Figure 2 shows an improved version which automatically resets itself after a while. The SCR works as before, but when the relay closes 12V is applied to the top of the capacitor, which then slowly discharges through he I OK resistor and the base of the transistor. The transistor is across the SCR and lets lie SCR release immediately after the lightning stroke is over. The relay stays pulled in for a short time...

Cw Filter

A CW filter is on the market that is hard to resist if you need help in the selectivity department, MFJ has a setectabie, 80, 110, 180 Hz bandwidth audio filter that utilizes four op amps 2-duaf 741's in a modern design performance package. It will work with any voltage from 6 to 30V and does not require an internal connection to your receiver. Packaged with the unit was a very complete set of instructions that makes sure you know exactly what you have just purchased, how it works and a number...

Low Pass Filter

Box 494, Stare College MS 39762 CLEANING SHACK W General Elec trie IVIA E 36 w 4 frequency deck. Independent T amp R frequencies, with 3 sets crystals and spare vib, P lt S. 125. Aerotron 6n1QG MA Amplifier, 3 15 watts in - 80 to 110 out. With spare 5894 tube new , 75. Hammar und FM-50a with 34 94 and 94 94 cry stats ac dc P,S, 25 watts out for only S50. All items are in good working shape, Rob, WB2ATX 201 224 9659. U WTEDj OLD RADIO TRANSCRIPTION DISCS. Any size or speed. Send list and...

Tempo

The CL-146 offers operation on the 146 MHz amateur band. The price includes a microphone, power cord, mounting bracket and one pair of crystals, A full line of accessories is also available, 12 channe capability 13 watts or a power saving 3 watts All solid state, 12 VDC 144 to 148 MHz any two MHz without retuning Supplied with one pair of crystals RF output meter, S-meter, receiver detector meter Provisions for external oscillator Monitor feature Audio output at front panel Internal speaker The...

Phil Mont Goes Fm

The Phif-Mont club, one of the larger in the country, is going FM, starting on 147.03 simplex and installing a Standard repeater for 147-63-03 later on. This should give quite a boost to FM in Philadelphia. When your repeater receives its new WR call, the second thing that you should do after changing the identifier is fill out the above form and mail it to 73. This will enable us to keep our repeater listing current and accurate- It will also make sure that the FM world doesn't forget you ,...

M F M

Working with high gain FET's on 2 meters can be a problem unless you know what to expect KlCLL provides rood working knowledge. plain Englisii. With reasonable bypassing, no self oscillation will occur at 147 MHz, and tuning will be good and straightforward. However several small peculiarities were noted, one happening when C2 was operated quite a way from the 147 resonance ponit, a click being heard. Note that I like to measure, look, and listen to what goes on when Fm working on a new...

Info

21 Low Cost FM Deviation Meier W9HD Lest you deviate from the path of righteousness. 27 Taming Those Hot 500 MHz FETS for 2m FM K1CLL 31 Two More Two Meter Amplifiers . . . . WB4DBB 35 Mini Repeater Control System - Part I WA0ZHT 1 This is the mini the ma gt ti js a whole book, 51 Getting Your Repeater Licensed W2NSD 1 55 Low Temperature Techniques for Radio Amateurs W1GNZ 59 Choosing Your FM 63 Europe on 2 Meters a Day W2EEY 73 Scanning Adapter for FM Transceivers WA4WTX 79 The RCA CMU 15 FM...

Gregory Electronics Corp

The FM Used Equipment People 243 Route 46, Saddle Brook, N. J. 07662 14 case less accessories amp ovens 6 12 volts, 30 watts, vibrator power supply Accessories available for each of above units Just Arrived General electric Message Mates High Band G.E. PROGRESS LINE STRIPS physically complete, but sold on an as-is basis only less vibrator_J20__ __S20__ __S20 less vibrator__ 25__ __ 25__ Jess final tubes 18 25 25 30 12 Note MA E42 wide band_____ 14 Progress Line Case, consisting of front basket...

Zed Bllcsky

1701 East-Wesi Highway, Apt. 205 Silver Spring MD 20910 This month I have been taking a look al some foreign ham magazines. These, like Radio Communication from England and Break In from New Zealand, are the foreign amateur radio societies' equivalent of the ARRL publication QST. The sections that make the most interesting reading are the advertise ments, especially when the text is in a strange language. It seems that the Japanese are marketing their wares all over the world. There are plenty...

Repeater Council Speaks

It ihas been reliably reported that at a recent meettng of a statewide repeater council the repeater groups represented agreed unanimously to keep their repeaters on the air should the FCC deadline of June 30th pass without the new call letters being issued. The identifier would be turned off, but the repeaters would continue. Perhaps it is about time the Commission started reacting reasonably to the needs of amateur radio and stopped 'ts dictatorial stance. I predict that the pressures will...

Heathkit Electronic Centers

ARIZ, Phoenix, 2727 w Indian School Rd. CALIF. Anaheim, 330 E Ball Rd , Ii Cerrito, GOM Potrero Ave . Los An elev 2309 S- Flower St Pomonit 1SS5 Orangt Grove Ave. N. Redwood City. 2001 Midd'efie'd Rd Sin Qit a U Me . 8363 Center Dr. woodland Hills 22504 Ventura Blvd. COLO. Denver 5940 W 3 th Ave., CONN. Hartford A onJh 395 W Main St Rte 44 FLA. M.imj Hiafeah , 4705 W. 16th Ave . CA. Allanta, 5285 RoswalJ Rd- ILL. Chicaio, 3462-66 w Devon Ave. Downer Grove, 224 Ogden Aye. I NO, Indianapolis, 21...

Henry K A

Cool and Easy Max Legal Power SSB, CW RTTY or SSTV through commercial ratings 3.5 to 30 MHz Continuous duty Silver plated PI L plate tank DC relays ALC Built in SWR bridge Out put power 2 KW min. in commercial service amateur linear amplifier available anywhere in the world at any price for only S1080-.the henry 3k-a .the LINEAR FOR the CX-7a . You wilt never know how little it costs to own THE incomparable CX-7A or Henry 3K-A until YOU write or phone us and let us know the trade in deal YOU...

Qsl Bureau

5200 Parum Ava,, Richmond CA USA 94S04 THE ONLY QSL BUREAU to handle eii of VOtir QSLs to anywhttr next door, the next state, the next county, the whoie world. Juit bundle them up please arrange alphabetically and send them to ui with payment of 5i amp o Til I s w lt tie tt Ahlji T r m m i r a 6 s wiictiatil Transmit 6 fetppve channels 2 mtier 1r jnitflnvcr PO Box BOO Biscayne AnnoK Miami Florida 331 52