Master Handbook

OF ELECTRONIC TABLES & FORMULAS by Martin Clifford In the introduction to this book, the author notes that there are a number of ways to solve problems in electronics. The first is to use formulas and to plug in or substitute numerical values As the author states,1 This technique calls for some arithmetic dexterity and quite often, a good working knowledge of algebraic and trigonometric functions, and sometimes a bit of calculus. Aside from the work involved, the use of a formula has the...

All Band Trap Antennas

PRETUNED COMPLETELY ASSEMBLED -ONLY ONE NEAT SMALL ANTENNA FOP UP TO 7 BANDS EXCELLENT FOR CONGESTED HOUSING AREAS - APARTMENTS LIGHT - STRONG - ALMOST INVlSlBLEf KOR ALL MAKES A MODELS OF AMATEUR TRANSCEIVERS - TRANSMITTERS -GUARANTEED FOR 2000 WATTS SSE IOOO WATTS CW INPUT FOR NOVICE AND ALL CLASS AMATEURS COMPLETE AS SHOWN wllh 90 ft. HG59LU52 ohm refdHne. and PL259 connector, Lnsuiniori, 30 ft 300 lb, lest dacron end support*, tenter connect or with bulK ifi lightning arrejter 4i> cl...

Worked All Lynchburg Ladies Award

The Lynchburg Amateur Radio Club announces the availability of a new piece of ''wall paper. This award, the Worked All Lynchburg Ladies Award, may be earned by working three YL members of the Lynchburg Amateur Radio Club. If you think that's difficult, sympathize with Lynchburg area amateurs. They must work five Lynchburg Ladies on modes other than repealer operation. This award is available at no charge. The applicant should submit the usual logbook information and it would be advisable to...

Awards

Managers of this new service Meet Laryl Myers N7BMY who is the General Manager. She is relatively new to amateur radio but is already a dedicated brass-pounder when she finds time. She has an extensive background in filing system management. It took Laryl only two weeks to learn the code and theory for her Technician license and then another two weeks after her ticket arrived to upgrade to General. She has definite goals of attaining 60 wpm on CW and indicates she will be an Extra someday soon...

Maumee Oh

The Toledo Mobile Radio Association, inc., will hold its 26th annual auction and hamfest on Sunday. March 22, 1961, at the Lucas County Recreation Genter, Key Street, Maumee OH. Hours are from 8 00 am to 5 00 pm. The free auction starts at 10 00 am, There will be ample free parking ali day and overnight. Tickets are 2.00 in advance and 3.00 at the door. Flea market tables are available displays are limited to electronics and ham gear. There will be commercial exhibits, refreshments, door...

Vertically

A typical parts layout for the af compressor. The layout is exaggerated, of course, but any similar layout where the input output is kept well separated will suffice. ceiver, as shown in Fig. 4, and insert a few additional stages for clipping, amplification, and filtering Some of the Plessey ICs make this particularly easy to do. he Plessey SL610C is an integrated rf amplifier having a modest voltage gain and a bandwidth up to 140 MHz, The supply voltage can be 6-9 volts, and the...

Fcc

Uld bv able To make (he call, lawfully because then two amateur radio station* * ould be involved So such convoluted rationale underlies the provision of i 79(d) On its face, 5 97.79(d) Hives 111K4 retlon hi an amateur operator la illow a non licensed person (Li , u ihird purly t i engage in communications tiling his Transmitter. under proper r imloiing conditions < ind Supen sion h> the Ik etwee. We concur with the Uff s view 3ha1 thin refers to two-way i ommuniL dtlon*. To chat this would...

Squelchtail Eliminator

Circuit Electronics, llnc,T of Salina, Kansas, is introducing three models of a repeater squelch-tail eliminator called the lltail-chopper. Ail models use temperature-compensated operational amplifiers and digital logic, feature 6-dB SINAD sensitivity, wide temperature range. LED to indicate squelching. and maintain normal hysteresis to 0.1 microvoli. The TG-2100 is a universal module that can be connected to most repeaters to eliminate squelch tails. It has a squelch enable-disable function t*...

Amp

Rf clipping can be added to most SSB transceivers by breaking the i4 c ha in after the SSB filter and adding the stages shown. Fig 5 Extremely simple but high-performance rf clipper circuit shown with a 9-MHz crystal titter adapted to practically any transceiver i-f, although the circuit as shown uses a sideband filter for a typical 9-MHz i-f where the upper-sideband c rystal frequency would be 8998.5 kHz, and the lower sideband crystal frequency would be 9001 5 kHz. The KVC crystal...

Omnic

With new coverage and new features to make it better than ever All 9 HF Bands. From 160 through 10 meters, including the new 10, 18 and 24.5 MHz bands. Coverage you can live with for years and years, 3-Mode, 2-Range Offset Tuning. Offset the receiver section or the transmitter section or the entire transceiver In 2 ranges 500 Hz or 4 kHz. For complete flexibility in fine tuning, a DX work, or net operations. Seven Response Curves, Four for SSB. three for CW....

Benjamin Michael Industries Hour Clock

What can one say about a clock, you ask Plenty, if it's this quartz-crystal controlled twenty-four-hour clock from BMI. How many times have you agonized over the conversion of local time to UTC Well, maybe you're smarter than II am, bul 1 always have a problem going from Eastern Standard or Eastern Daylight to UTC. t'll admit it is a bit simpler before noon, but in the afternoon Ugh Enter Benjamin Michael Industries with their little liquid-crystal-display ciock, tt sits quietly on the table...

The Flexi Flane Antenna

This scrawny ducky will boost your HT's signal Do you have a 2-rneter handie-talkie Where and when do vou use it If you're like me, you probably imd your> elf with unit in hand in a variety of circumstances. Vou may be chatting across a hamfest on 52 trying to make a drs tant repeater from a mountainous site you have arduously attained, or coordinating a civil-defense drill What do you use for an antenna For general toting and flea-market work, the flexible rubber ducky makes a fine antenna,...

Info

COVER Talk to the world through your 2-meter handie-talkie Metroplex, the New York City metropolitan area's most sophisticated system of inter-linked repeaters, has over 400 members, including 50 overseas amateur radio operators Metroplex was conceived in January, 1978T by K2KLN and W82MGB To establish repeaters on all allocated FCC frequencies use ail available modes provide 24-hour emergency communications and provide a forum for east coast and worldwide amateur radio operators, via a 2-me1er...

Uu

Y1 Statek 16.000-kHz crystal, type SX 1V (available from S1-S16 Two 16-pjn DIP switches or 16 toggle switches or four BCD thumbwheel switches S17 SPST switch B1 9-V transistor radio battery PC boards are available from the author, tinned and drilled on G-10 epoxy, for 15.00 postpaid- We Want to DEAL Call Us We'll Do It Your Way. NOTE SEND S1.00 FOR OUR CURRENT CATALOG OF NEW AND RECONDITIONED EQUIPMENT. * ALSO WE PERIODICALLY PUBLISH A IST OF UNSERVICED EQUIPMENT AT GREAT SAVINGS

Conley Radio Supply

Billings, Montana 59101 John Edwards KI2U 78-56 86th Street Glendale NY 11385 What are hams really like Have youh like many of us. ever pondered this question What is it that draws people into amateur radio rather than, say, stamp collecting This month, we're setting aside the usual crossword, acrostic, matching, and other puzzles, and replacing them with something dif* ferent. Something, we hope, that will be just as enjoyable as any puzzle to complete. What follows is a poll a...

Corrections

There are two errors in The Sweet Sounding Probe1* (July, 1980. p 84), First, output capacitor C6 is drawn with its polarity reversed. Second, there should be a connection indicated at the four-way crossover point of pin8 of the 555, the left-hand lead of R6Pthe + 12 V tine from the regulator, and the line which eventually leads to pin D. Howard Batie W7BBX 12002 Cheviot Drive Hemdon VA 22070 Readers interested in contacting the author of Super Duper for Field Day (November, 1980), p. 114,...

Revision

L1 r '> not tnctuOf1 SQ kGf twitches or 2708 ROM Wdt rrta e opp-n rr me iransTorrtiiir .Ift mc'jfiling uiiaa and iZsui , wir inexpensive jiris. FTM schematic oi cesngrt. Pnmary 17VAC SEC*1 15VAC j SA S C 2 T5 VAC 5A SEC BVAC f 2 5A Q5 iMALL SiNGLI HYBRtDlfe AND COMPONENTS F1TON A 2 x 3 PC BOARD INCLUDED) RUNSON 12 VDC GREAT F( > R ANY PROJECT THAT N11. D5AN INEXPENSIVE AMP i ESS THAN 3iJv THD495WAT1& COMPATIBLE WlTiH SE-Oi SOUND KIT AV3-S910 PRGGfiAMMABLE SOUND GENERATOR Tiiv Is .1 -10...

Home Brew XBand Wavemeter

indispensable test gear for microwave mavens The need to know the operating frequency of an amateur signal in the X-band assignment can be met with an adjustable cavity wavemeter and a detector. The cavity can be adjusted so that it accepts a small amount of power from the transmitter, and the detector, which is coupled loosely to the cavity, sees' this energy and converts it to a small current that will operate a micro-ammeter, which serves as a resonance indicator. have some sort of dial...

A M

RepJace coils with lossless linear loading 2. Fold back and symmetrically place linear loading for mechanical strength and balance, 3. Extend element to 1 4 wave on 15M. Fold back and decouple tip wiih C2 4. Extend Tip for 20M Tuning of 15and2GM is independent enough heat-sink area to dissipate the heat produced in nor mal operation. We never pushed the finals hard enough during any of our tests to cycle the ther mal shutdown device. Operating the 707 is a pleasant and rewarding experience....

Waveguide

Cavity wavemeter circuit diagram. one-turn link to the tank coil In the microwave coiv figuration we will use, this is simply a small hole in the F-plane wall of the waveguide The diameter ot the hole determines how much coupling there is to the tank circuit, which, in our case, is the cavity. The diameter of the hole controls coupling and many other factors. It must be placed carefully so that the match to the transmission line will not be upset. Now, let us examine the construction of...

TR Behind Bars

One day while evaluating various LED bargraph displays at the workplace. my thoughts momentarily turned to ham radio ' Hey ' I thought This bar graph would make a terrific cuitry, be made to fit I was sure it could, ds t have had the meter out of the TR-7400 to replace the lamp bulb The only questions remain- Photo A Completed un t readv for installation, Voie the two-board construction Photo A Completed un t readv for installation, Voie the two-board construction mg wore 1 What is tht drtve...

No

2 Presetiable Speeds, Instant Recall Standard Letters Numbers, Punctuation S199.95 129.95 9995 S129.95 79.95 S139.95 MT-1P portable version of MT-1 with batteries- charger, earphone ME-1 2000 character pfug-in memory expansion for MM-1 AC-1 600 Ma. 12 Volt wall adaptor for MM-1 with ME-1 A02 350 Ma. 12 Volt wall adaptor for all AEA keyer and trainer products except MM-1 w ME-1 DC-1 Cigarette lighter cord for all AEA keyers and trainers except MT-1 P MT-1 K Factory conversion of MT-1 to KT-1

Suh

Consider the battery charger cireuit shown in I ig. 1, Two outputs are provided to charge two 6-voltr 5-Ah batteries at a time. One of these outputs can be left disconnected if only one battery needs to be charged The two 12-vo t transformers step down the line voltage to the proper battery charging voltage Note the alternate primary connection for 220-volt operation. Diodes D1 and D2 change the ac to dc for battery charging. Resistors R1 and R2 limit current for proper fast-charging. Lamp L1...

Mfj Shortwave Converter

Car Radio Shortwave Converter

I have always enjoyed listening to the shortwave broadcast bands. The BBC, Voice of America, Deutsche Welle, Radio Moscow in very small doses , and countless others provide commercial-free programming of a very high quality. A lot of hams woutd like to spend more time listening, but they Just can't seem to find the time. When it comes down to a choice between operating the ham station and listening to shortwave broadcasts, the ham station always wins A few years ago, I...

Fivemode Keyboard

A five-mode sending terminal introduced by Curtis Electro Devices offers Keyboard origina tion of Morse, ASCII, and Baudot codes in addition to being a paddle Keyer, code practice generator, and contest memory unit. Called the KB-4900, this unit blends the power of a microprocessor with the ease of analog controls and indicators. Features include a 256-key sending buffer and a 256-key soft-sectored message memory with up to four callups, The two-key locKout and fully debounced keyboard offers...

Lp

Had another ham who Knows the ropes to help. I have listened to the iocal repeater till I am somewhat blue, but no one ever gives out their phone number and of course i do no dare give a caM, since the laws here are very strict about that. Second, t am looking for a simpie circuit which wilt help us in a Bible competition a question and answer type of pro gram. The requirements would be as follows One button per each team member. Three teams, 4-6 members per team When a team members button is...

Yaesu Ft Hf Transceiver

Yaesu 7070m

Checked any equipment prices lately When it comes to equipment, hams have never been able to get so much quality and performance lor so little money. The new Yaesu FT-707 HF transceiver Is a good exampie. It offers features and performance equal or superior to top-dollar rigs of a few years ago. Today1 the FT-707 is one of Yaesu's least expensive rigs, it says a lot for the state of the art when a relatively inexpensive transceiver offers the features this new Yaesu does. Let's take a good took...

No Duplexer

JOIN THE FUN ON 10M FM This new phase of Amateur Radio fs growing every day and is one of the most exciting new modes of operation in years 10M FM COMBINES ALL OF THE BENEFITS OF VHF FM OPERATION WITH H F LOW BAND11 OPERATION Le.P the quiet, noise free QSOs of 2M FM except better ground wave range, with less mobile fading and flutter due to hills and trees, etc. Plus occasional Skip contacts ail over the country and around the world .with all of the clarity, solidness'1 and ease of cross-town...

A MHz Repeater

Any experimenter who has ever pondered the potential of the new license-free 49-MHz band can't help but see freedoms from regulations to experiment here that are denied in ham radio. For instance, a transmitter operating here isn't required to identify by callsigns, nor ts it limited to any particular emission. While most hams might not consider this a handicap, an experimenter who requires a radio transmission of short range, as in the case of telemetry, can avoid a lot of inconvenience and...

Signal Generator

AN URM-25D ponaiite generator covers range in fl sands Output 0 to sQQK u-V into 50 ohms. Modulation OWo. 1 400 or 10QU ttz 1 MhzcaH-Draof 9 tvbes Requite H5 VAC 50-1000 Hi UVixl4 J 1044 lbs. sh wt Used. repa dijie w outpul 125. CJiackei 195. ACCESSORIES available only with purchase of sel CX-1363 m lt 630 dapter S6 MH-1487 rnoped-em aospler S6. SM 35 nienna stm iaior S5. ZH-22Z 5 1 atterrualor 5. C HUA it i S6. MANUAL, partial repro 10. SIGNAL GENERATORS, used-eperatitmallv checked HP-606A 50...

Ir

A practical circuit using the SL1 amp 26C is shown in Fig. 2, In addition to the resistor capacitors mentioned prevtously, several other capacitors are used for rf bypassing A balanced input is shown, although a single-ended input can be used at the sacrifice of some of the control range. In general, it is better to use a small input transformer of the transistor-interstage type. These transformers are inexpensive, and a 500 50k0hm type will suffice for most high-impedance microphones, while a...

Top Trades Given

If you have clean, unmodified with manual, Atlas, Collins, Drake, Icom, Hammarlund, Hallicrafter Kenwood, National, Swan, Tempo, Ten-Tec, Yaesu, and also will trade il you have clean military receivers, R-220 URR, R-388 URR, R-389 URR, 51 -4, Racal, Watkins-Johnson, late model Avionic and test equipment. We offer new factory boxed equipment by Collins, Draice, I com. Swan, Tempo, Ten-Tec plus all lines of accessories and antennas. We stand behind our 28 years of fair trades with all our amateur...

Test Equipment

ftF AMO OIGITAL TEST EQUIPMENT YOU CAM BUILD-BK104J - Rt burst lunch n square ave generalors, variable length pulse generators - tQG kHi marker, i-l and rt sweep generators, audio osc, af rf signai iniecior, 146 MHz synthesizer, digital readouts lor counters, several counters, pruscater, microwave irteler, etc. 252 pages. 15.95.r VOL, COMPONENT TESTERS LB7359 - how 10 builcf translsloi testers J8 , diode testers 3Jt re tesier s 3 , voltmeters and VTVMs 9t, ohmmeters deferent kinds ,...

M

Anutvur rijijjpirwni mviJi A iitimrds i OI gt L s A t prjrt Am W btrv. A ICUf A trnrrtrifii rrp if fMti- 2317 V ai gt ct Jackson RcLStn Antonio. TX L _ 512 734 7703_ 35w 2m FM AMPLIFIER KIT MODEL 335-K 3 IN - 35 OUT 2 IN - 30 OUT 1 IN 15 OUT COR CLASS C 4 5 A AT 13.6VDC BNC CONNECTORS ASK ABOUT OUR 2648 NORTH ARAGON AVE DAYTON, OHIO 45420 , 513 296 1411 '