Hygain Electronics Corporation

Box 5407-GF, Lincoln, Nebraska 68505 Handles Large Beams And Stacked Arrays With Ease Up to 10 times the mechanical and braking capability of any rotator on the market The ROTO-BRAKE delivers over 4.000 IN LBS of starting and rotating torque, Brake slips at 5,000 IN LBS to prevent damage to parts. Motor and gear train are protected by husky cast aluminum housing. Handsome control unit features sweep pointer over choice of great circle map or compass rose. Select desired position and...

Forward G A Is

IMPEDANCE. 52 ohrr*, RECOMMENDED TRANSMISSION t (NE- RG-8 U MAJCMLM* ELEMENT LENGTH 24' V WIND LOAD tElA StdL SO H0.4J tfa*. APPROX. Shipping * fight U fb* v.j truck FORVtAflD GAIN 5 3db compared to rflterftnee dipole II.Bdb aver isoliopic source . FROlNJT - fO-BACK RATIO 21) dh Mosley Electronics Inc. has developed the Classic 20 to give amateurs a 20 meter singleband beam featuring the Classic Feed System (Pat. No. 3419872). The improved electrical balance, Balanced Capacitive Matching '...

A

Somewhere along the line, in virtually every ham repeater in th world, you'll find a couple of Sentry crystals. Repeater owners and FM ''old-timers don't take chances with frequency they can't afford to. A iot of repeater users depend on a receiver to be on frequency, rock stable ,in the dead of winter or the middle of July. The repeater crowd took a tip from the commercial pros a long Time ago and went the Sentry Route. That's one of the reasons you can depend on your local repeater to be...

Lem

Motorola PNP Germiinium Pcnver 5S Watts 75 RCA PNP G f rm jTi um Po.vtir 7 5 Wans . . 75 Motorola PNP Gern am um G n pi P jrpose PNP Gern anium Geneva' Purpose Tcxjs I M t. PNP Germ3 nig m Power 150 Warn,. Motorola MF 1546 Hrgh ReliohiJttv 90 Win rs Motorola or DelcO Sirnitflr lo 2N1 > 00 40 Watts F air hilcJ NPN SiliiOri General Purpose . , > . . - Moioi-oij PNP Ge'mjniurn Power 35 Wait* . ,

Ant I

This is especially true on the higher frequency bands. In order to revert back to omnidirectional operation, the secondary antenna is disconnected af the transmitter and the transmitter reloaded. The spacings and phasings shown in Figure I are conventional ones welt known by any amateur acquainted with driven, phased antenna arrays. Many amateurs, however, falsely think that there are only a small number of spacing and phasing combinations that provide useful directional...

Atlanta

The Atlanta Radio Club will hold its 44th annual hamfest June 13tli and 14th at the North DeKalb Shopping Center. The main prize is a Swan 500C transceiver with ac supply, along with many others. There will be many contests for the amateurs as well as games and other activities for the ladies. Further information may be obtained from John Fear i , 3384 Peach tree Rd., N.E., Suite 705, Atlanta, Ga., Tel. 261 -4924. nounced that he is managing the QSL end of the DX business for KH6EDY, Kure...

B

For the purpose of explaining these two the necessary factor by which you can is a graph showin The attenuation in dB ft of RG-5 U v.v fs& Kit Sfc siis * i consulting Fig. 1 you see that at 20 0,015 dB ft loss exists at 68UF, However, v.v fs& Kit Sfc siis * i oft his graph, y op shows the effects of frequency change on

Band Remote Control Model

This is our most deluxe model, for the band hopping operator. A control box under the dash permits instant band changing while driving. Covers 10, 15, 20, 40, and 75 with the same patented* electrical and mechanical design as the manual model 45, but with motor drive and remote control. Finest quality construction, nothing has been spared to make this model the very best, and most efficient you can buy. Power rating is 1000 watts P.E.P. 5 foot whip comes with Kwik-On connector. Extra KWIK-ON...

Bti Lkhd

For heavy duty applications juch os MARS, high power RTTY and 5SB, Write for ffee brochure or send 1 00 for rechnicol instruction manual. with daily reports in the U.S. The Public Service Company has a meter-reading microwave link, too. It's quite an elaborate electronic installation. I use 73 for ideas adaptable to our business. Currently, we are very interested in 900 MHz equipment adaptable to UHF television trans* lators. George S. Johnson Sandia Television Corporation (NSL) Surpressing a...

Ca J

Electronic vernier tuning provides a more precise setting of frequency with or without modulation for the solid state nuvistor oscillator, FM signal generator. Incremental electronic tuning allows the frequency to be adjusted 16 kliz eitiier side of zero center. The unit s automatic level set now sets a red line reference automatically. External modulation and deviation sensitivity of only one volt input provides j full 16 kHz deviation eliminating the need for high powered external signal...

Coax Adapter Vhf to BNC

Many new converters, SWR meters, and other accessories are now coming oul with the newer BNC coax connectors on them. Most hams have been using coax equipped with the PL-259 plug or similar larger size connector. A simple, easily-constructed adapter can be assembled as follows, at a cost of approximately 7 5 cents according to current bargain-counter prices. All that is needed is one PL-259 plug and one UG-1094 U* The latter is the BNC type also known as UG-625, and is the singlehole...

Connection

In contrast to its appearance, this antenna, like a 4-wavelength vertical, develops a vertically polarized radiation signal. It is also interesting to note that this antenna displays exceptionally high Q and for antennas for other hands. General construction details are suitable for all frequencies with sizes of assembly hardware being modified accordingly. Sign if i- cant variations, when they occur, such as with radia's for low frequency units, will be described in detail. The solution o (he...

Converter

144-146 MHi In. 28-30 MHz out or 146-148 MHi with a second crystal A full description of this fantastic converter would fill this page, but you can take our word for it (or those of thousands of satisfied users) that it's the best. The reason is simple we use three RCA dual gate MOSFETs, one bipolar, and 3 diodes in l1 e best circuit ever. Still not convinced Then send for our free catalog and get the full description, plus photos and even the schematic. Can't waitTThen send us a postal money...

Devices

Hot Cjn-ier Dioiirt HP28G0. ,. . , 9W. 12--51Q.OO Matched bv HAL iC't f L MRTL C790Pr MC890P 2X0, 10 S19.50 MC724P ,'iC7B9P MC792P MC72SP Si .05, 10 9.50 Also Avaiiabte MC7B0P, MCS80P. MC767P, MC9760P. OP AMPr SN72709N fDlP 1.75, 7 S10.00 TCROIDS tndiara Gern.i j CF 1U2 Qfi, CF102 Q 1 CF I01-Q2, 50(i CINCH tC ackeii, )4-OIP. 8 ICS 60* HAL DEVICES Atfd Po- u e. end 'or vnpi w Irti Box. 365 LH Urbana, Illinois 61 SO 1 imvitjtact nd h, IjHfFor ALL Amaieur Transmitters Cortip3eie er. Light, Neat....

Dmph

4 -BAND WONAJ CH CUSTOM Hi'Q, HJ-VOtTA rHAPPiO SINGLE T1 THAffEO* JINGLE IRAKSMISSION UNE AllftAY 8,0 DB 23 DB 62 5> 0KWP 3.5Q 3'V31I 176 Lbi. 58'-0 EMPIRICAL- LOG MONARCH CUSTOM 3-r d-lcnd twv'ucxfl Covurog* AMO* 0 V ETE* MC NAfiCH CUSTOM VCNO -BAND AjttAYS 0OM2 2 ELEMENT ROTARY

Electronics

305 Airport Road Oceanside, California 92054 A Subsidiary of Cubic Corporation Here s whyThunderbirds outperform all other tri-banders Thunderbird's Hy-Q traps provide separate traps for each band. Hy-Q traps are electronically tuned at the factory to perform better at any frequency in the band - either phoneor CW. And you can tune Hy-Q' traps, using charts supplied in the manual to substantially outperform any other traps made, Thunderbird's superior construction includes a new, cast aluminum,...

Element Model Tb

Of somewhat lighter construction and shorter boom length, the TB-3 is adequate for many installations. Wind survival rating is 80 mph compared to the 100 mph rating of the TB-3H. Its lighter weight permits easier erection, a lighter weight tower, and lighter duty rotator, all resulting in lower overall cost The same precision tuned, weather proofed traps are used, so power ratrng and reliability are the same as in heavier duty models. Boom length is 14 feet Forward Gain 7.5 db average. Weight...

Element Model

The Swan 4 Element Heavy Duty Triband Beam gives you 4 working elements on each band 10. 15, and 20 meters. A 24-foot boom permits optimum spacing for maximum forward gain and front-to-back ratio. All traps have been precision tuned and weather proofed. The Heavy Duty mechanical design of the TET 4H means that it will easily take winds up to 100 mpht and provide years of reliable service in any kind of climate from the arctic to the tropics, Forward Gain 9db average * Power Rating 2000 watts...

Fermanagh Festival

L or the second year running an amateur radio station will be established for Mr* duration and in conjunction with the 1970 Fermanagh Festival. The station, GB3FRE, will be in action at the Townhall Enniskillcn, from Friday, June 19 to Sunday, June 28. At least two fully equipped operating positions will be set up. Operating time, which will be mainly in the evenings, will be spent most of the time on 160, 20, and 15 meters, sideband and CW. (1) To enable hams throughout the world to have a...

Fold Over Kits

Two units are available, both at a List Price of 250.00. The 8 minute unit for light to medium loaded towers the 18 minute unit for heavily loaded towers (generally those where the SOHB mounts to 26 section or where the FOK folding point is between 26 sections). fn operation, the gearmotor and harness simply pivot along the same axis as the Jack screw as it declines from the vertical to approximately 45 and back to vertical the folding segment of the tower can be declined as far as 30 below...

Forward Ca In

3 db pffipa to rtfcftrK f 10.1 ovtr i otroptz joi rcf Now Classic Feed plus Optimum Spacing the Classic Feed System, famed for its phenomenal success in multi-band beams, has been incorporated into two single-band three-element beams for 10 and 15 meters Models CL-10 and CL-15 In addition to the optimum spacing possible, these new Mosley beams offer the maximum gain, increased bandwidth and more efficient performance provided by the better electrical balance Balanced Capacitive Matching ' the...

Hamfest

The Six Meter Club of Chicago, Inc., will hold its 13th annual hamfest in Frankfort, Illinois, on Route 45, one mile north of Route 30, on August 2, 1970. We anticipate that at least 1200 licensed amateurs, members of their families, and others who share an interest in amateur radio will be present. Contributions such as electronic parts, kits, components, books, QSL cards, antennas magazines, instruments, gift certificates, etc Will be gratefully appreciated. All contributors The 16th annual...

High Q high efficiency

WILL YOUR MOBILE ANTENNA PASS THE TAPE MEASURE TEST Try measuring the wire size, coil diameter and coil length of your loading coil. If the figures are not as large as the Swan loading coil, then radiation etfi ciency cannot andl will not be as high. It's as simple as that. A mobile antenna is, of necessity, a compromise. It takes a loading coil to make it fook like a quarter wave vertical. Radiation efficiency is related directly to the Q of the loading coil. Q is a figure of merit which is...

I

F the attitude of some amateurs is lo be credited with any validity, there would seem to be a grossly misunderstood provision of the regulations, or at Least of the FCC interpretations and administration of those regulations, I refer to the rules governing third party traffic. There are cases in which it would be normally assumed thai violation notices would inevitably ensue. Bui there are other instances which pose some doubt, here is an area of ambiguity in the minds of many, although the...

Greater Gain Than The Yagi Array

FOR THE SIZE * REJECTION OF UNDESIRED FREQUENCIES AND NOISE ABOVE AND BELOW BANDPASS RESPONSE The Swan bandpass antenna, developed for use in home television reception, has recently been adapted for the 2 and 6 meter amateur bands. Swan's bandpass antenna has the combined properties of constant impedance match across the entire passband of response, with gain superior to that of an equivalent-sized yagi. he antenna features a very high front-to-back ratio as well as front-to-side in both the X...

I I I I I

Quite different from that of the usual swr meter. I he differences, which are explained later, should be well appreciated. The use of the swr indicator was mainly checked on 40 and 20 meters* The length of twinlead used as the pickup loop was taped to the transmission line. he components shown in Fig.2(A) were compactly assembled in a plastic snap-open box measuring about 2x1x1 in.T which was acquired as the result of some now unknown purchase. However, almost any similar lightweight enclosure...

Oig

Monitors Transmitter's CW Transistorized Kit or Wired Built-in Speaker Low Cost The Model OCM is a combination Code Practice Oscillator and CW Monitor. It monitors your CW sending with a simple (no modification) connection to the keying terminals transmitter, It may be used with any transmitter or transceiver employing negative bias keying. A tone control, as well as volume control, and head phone jack are included on the front paneL Built-in back-to-back diode switching makes it unnecessary...

Ifielddaycontests

The German Amateur Radio Club invites amateurs from all over the world to participate in the German Fieldday-Contests 1970. These contests are mainly for portable operating outside the home, independent of the mains using only batteries or petrol-electric generating sets for power supplies. For complete details contact Norbert Meyer DJ7JC, DARC Fieldday-Manager, POB 1752, D-463 Bochum, Germany. ''Second Sunday in June 1 Third Annual Hamfest of the Foothills R dio Club, Inc., of Greensburg, Pa,,...

Inc

Dept. 8. 925 Sherwood Drive Lake Bluft, 111 60044 two classes of license for Jordanians, a Class B and a C lass A, Both would require five words per minute code speed, with the Class B permitting restricted power operating in the C V bands on 80-40-15- (K plus phone on the VHFs. The B i cense would be similar to our Novice in difficulty and the A would be more like our General I also proposed a special visitors license good for ten days and a license for aliens resident in Jordan, both...

Info

Shipfjing Weight (opp'< 5 + ItrtJ 5t*HDJ *C CMTHL CDMULF ImtlH 4 imtPLO* AW 5t*HDJ *C CMTHL CDMULF ImtlH 4 imtPLO* AW OTHER EXTRA-HEAW-DUTY ROTATQR-SELS YNM ND1CA I OR SYSTEMS AVAILA& LE. PftTenledi aluri Fed In vwted-Vee* 2KWP and 4KWP Anlenni Kill Simple io > el up, hi-ptrformanc* anlenna terns Kiif include talented ancapsblilad i'oad-Sjn ta-lun. 200 ft an Unna wir*. ifiSulfllon n< 3 CQmp tit io-il'uCNOni rCI c eGtrnj Mens 40 cr flOM Inveded-Vee Of Fan-Dipolo 40 B0 Metei l efled'V e...

Join The Fraternity

HAVE THE BEST SIGNAL-USE A HUSTLER OR TWO You get top slgnai reports consistent contacts. That's why Hustler is the number one choice And only Hustler has 50 ohm nominal base impedance, quick hand change, broad band width, adjustable tip rod resonators, and exclusive 90 vertical plane and 360 horizontal swivei tip over mast with years of proven performance RM-IOS 10 METER RES. RM-15S 15 METER RES. RM-205 20 METER RES+ RM-40S 40 METER RES* RM.75S 75 METER RES. 2 KW PER. Model HF-62 for cowl or...

Jt Hookup Aire Around Lj

A space problem an installation problem a budget problem an applications problem or simply a problem of where to buy Your one-stop solution is ANTENNAS, INC. Exclusively specialists in radiating systems, complete systems or any component part. Arrays complete or in kit form, quads, yagis, dipole assemblies, verticals fixed or mobile, towers, masts rotors, guy and control cable, transmission line, coax relays and switches, connectors and adaptors, test gear, technical publications, corrosion...

Jt Qmc Element Array So Gmic Element Array

S 9 95 2M3C 3 ELEMENT ARRAY 15 95 2M6C 6 ELEMENT ARRAY 23,50 2M3l< ELfMENT AWAY J46 30 2M 1520C 15 ELEMENT ARRAY S10.75 OD-2M -RDcUt Vertical Drpolt J15.95 OD *-6M Rod-sP VflfiJcal 0 poU 49.95 10M309C 3 ELEMENT ARRAY 9 .0Q 10M5 2C 5 ELEMENT ARRAY 519.95 OD-IOM RxK if Wtlitci Dlp-lr S64.93 15M312C 3 ELEMENT ARRAY S25.95 OD-I5M RocVot V wHcnl< D pote

Khvk

What s wrong wifh this picture The piiot lamp has been installed immediately below the tuning capacitor. The glowing lamp looks great when the vfo is in use, but the heat of the lamp does interesting things to Ihe frequency of operation. De t C. V ininger WB6JNI 7400 Tiptoe Lane San Jose CA 95129 De t C. V ininger WB6JNI 7400 Tiptoe Lane San Jose CA 95129 he hypothesis of antenna reciprocity hat is, a good transmitting antenna is a good receiving antenna is only conditionally true. A tuned...

KWP

50 * 314 1* 3 .50 *39-3 50, 3-as-3 50 r 3 Til-BAND MONARCH CUSTOM Hi-O, Hi-VOLTAGE TRAPPED SINGLE TRANSMISSION LINE ARRAYS 129B.O TB5CM 10-15-20Mit< r 1-4AND 1448.00 T& 6EM 10-15-20 M*t r TCI -BAND DUO-BAND WON AUCH CUSTOM Hi-Q, Mi-VOLTAGE TiAiwo* single transmission line arrays

L

Theoretically, this method of feed should be less efficient than the shunt-fed method. This may be true for the long haul, poor conditions, DX work however, no significant difference could be detected between the two antennas under normal operating conditions. One of I he advantages of I lie DDRR is EVr' fi * r --RfjJjB. pi EmIUU J its high-Q characteristics, which greatly reduce noise and help to minimize interference. Unfortunately, these characteristics limit the band coverage of a...

Life

NEW HAMPSHIRE 03458 805 East 20th Avenue Vancouver 10, BC lien there is some standing wave on u feeder, the actual reading on your directional coupler doesn't really mean very much unless you keep adjusting the forward power ior full-scale deflection before reading the scale on vswr. Generally speaking, you won't go far wrong if you concentrate on tuning your antenna or transmatch for minimum re* fleeted power, but sometimes you may find the forward power has...

M

If you want a stable, simple vfo for 80 and 40 with full bandspread on both bands and possible 20 meter usage with bandspread on about 2 3 of the dial, read on. This is basically the rig from GE Ham Tips of March-April 1959 without the complicated inductance and capacitance switching which is used there to get full bandspread on all bands. This unit starts at 160 then doubles in the phie circuit to come out on 80, Switch SI (Fig. 1) cuts out and inserts t 3 in order to give full bandspread when...

Mark Ii

hile in college this past school year yy we designed the Little Wonder antenna described in 73 Magazine of May 1964. This article brought a flood of mail from amateurs all over the world. Moving from the college dorm back to my perma- iii 73 Magazine, August i 969. he reader will quickly note the simplicity of tile 1 Little Wonder, The Little Wonder Mark II has the same simplicity, but two added charms (1) its appearance is more attractive with its scant 7 ft stature and nent home the Little...

Meter

Just uncovered a batch of the famous ARC-3 revrs & xmtrs with all tubes. Range 100-156 mc, 8 xtl channels. Cheap way to get on 2 meters, CD nets, MARS nets, etc. With conversion details- Rcvr 15, Xmtr 15 where a wide frequency response may be needed, a special fctphase inverter circuit may be used to generate two signals of equal amplitude bul opposite phase. These signals may then be fed individually to the two halves of a push-pull amplifier, and the two outputs from that push-pull stage...

Military Electronics

24 PAGES, c tum med niLh Guv't Surplus Electronic Gear - the Biegest Bargain Buys Ln America It wilt pay you to SEND 25c For your copy -Refunded with your Eirai order.___ BC-645 TRANSCEIVER ih lubua. 43G Lis & cJO Mc, Easily tdepU-d for 2 way voice or codn on Ham, Mobile, Television Experiments, and Citizen Bands, With tubes, leas power Uiply , nc in faclLry carton. BRAND NEW SPECIAL PACKAGE OFFER BC-645 Transceiver, Dynamotor and all accessories, Including in Limiting, Llif Antmna...

Modulating Jgnal

This oversimplified schematic of a tetrode balanced modulator is intended to show only the operating principle. A J arrangements for tuning the grid circuit, supplying grid bias, and bypassing the screens have been omitted. Carrier input applied to the terminals labeled IN goes to the two control grids in push-pull, and balances itself out so that none emerges in the parallel-connected plate circuit, tVheji modulating signal is applied to the screens, also in push-pull, the circuit's...

Ne W Tr On Ics Corp

15800 commerce park drive, brook park, ohio 44142 advised by my lawyers that ou goons don't ever proofr T Insist thet you print ev should be boiled in oil ov I am a prospective Grade II (5 wpm) ham (expecting mv license). Maximum power allowed is 25 watts in the 14000 to 14350 kllz amateur band. In our country, ham equipment is not available tor sale. However, 1 have managed to procure one junk Hall i era fters SX-28 which is in working condition. I hope I shall be able to rig up a 25 watt...

New

Mm wlih moN M t*r mert color FuNy < ftjcribei h long with dwi 500 kitt lor leito hi'fi. color TV. dtfctionic Uf( rt3. em -t*t mplifitrt, mil ur itdio. mtrmi ifluejlmnti. CB. Horn a hc& br mm covpon of fitt Hulh Cgmpjfif, Hf nro> *. fcirbor MicNfin 41 fitnton Htjbaf. Micnifin 49022 Q f ndoiid ii 1______ *M dar pnen FOB iKtO'v. Prtcts t ipKiriutions sirbjtct to chan mth jt notice

NEW Heathkif SB

-- -- New all solid-state Linear Master Oscillator gives -102 specifications receiver section seoiiiiviiy shorter warm-up, greater stability, increased dial mi.c *cl1,fort. da f - rt For SSB operation, SSB eleetivily 2*1 kHi minimum or 6 dB down, linearity . New receiver circuitry delivers 0-35 5 kHz mQjfjmum ot 60 dB dowr nomino shape facfor 6 6Q uV sensitivity 180 watt PEP SSB input - 170 de cw Selectivity (With optional CW filter S0A-3O1 -2 installed) watt CW input 80-10 M coverage USBT LSB...

North Dakota

Tt is the morning of Independence Day, Xund Lindbergh Field is socked in -closed. Poised on the San Diego runways are 92 planes all with lady pilots ready to take to the air for the 23rd Annual Powder Puff Derby The destination is Dulles Airport, Washington. D.C., over a prescribed 2500-mile route with designated checkpoints and stopovers. Amateur'radio's problem Relay to race officials, on both coasts, arrivals and departures of all 92 planes at every one of the nine checkpoints along the...

Ok

Is designed to allow the CW operator to transmit morse code with a MINIMUM of hand motion. No other keyer exceeds the DK-1 in this respect. Code speeds from 7 to 60 WPM with correct inter-letter and inter-word spacings Mercury reed relay for transmitter keying and receiver muting input for manual key Keying monitor with built-in speaker 18 integrated circuits, 12 transistors, 5 diodes These examples illustrate the minimum hand motion required. The dot and dash keys may be closed or released in...

Oppins

Fig, 5, Assembly technique for DDRR ground plane radials for 20 and 40 meter antennas, Ai V.SuW TJ0E FORMEE 1HT0 r-Q THE PLA E ASSEwflL* e'ii i -4'THUCf * H> -Ot-E FOF RADIALS CVCNLY e'ii i -4'THUCf * H> -Ot-E FOF RADIALS CVCNLY T BUTT COtiME TOP * S43CU FfL.EE) HO FiT SlSG

Per Pound

Not at oil That t about what you will pay whether you buy a box of parts or fully assembled, rugged, heavy duty BTI LK-2000. Extra weight means extra dependability, plus Adequate back-up power * Good harmonic suppression - Operating convenience * Eimac 3-1000Z ALC * Fast acting overload protection * 80 through 10 meters Prestige styling * cooling, even on a continuous use basis. maximum legal amateur input . , . SSB, CW, RITT, Price . . . . 79500

Pje X

Y. 3- N.Y. VVor* mor Q X with ttie ngnt aniennn or vour location 3SJew < < oo* fu slop stet Instructions i 1 76 pages. 200 i lluit ral ion* I for building every typ* sntenrj long ir , d. oitii v gn, ifBP etc Flui mjny ot flfs not (Jeicritjird efse r'icrt lo 1. cosi rmfifaiure IfOm to er e Tv jrtrerir.Ji in of c tip ms J in visibly' arteo naiL t indoA sill jniennai 0 mfticr t> e3rr.> vertncai tjojmi Novit Band DXh mjoy, many other Secrets qi tun* Up of boih...

Preamps

S21.95 ppci. to 300 MHz. 25.95 ppd. NEW FOR 1970 The above models now have rf gain control. Available from 5 MHt to 4S0 MHz. Bandwidth is approximately 3 of frequency, Voltage gain 30 to 40 OB depending on frequency, Two Duof Gate MOSFET amplifier stages with each having a tuned Input and tuned output. Each Dual Gate MOSFET is actuafly an integrated cascode circuit thus giving you 2 cascode circuits equivalent to 4 Modes, Exceptionally low noise (2.5 DB at i75MHr)< greatly reduced...

Qoelch

The new VANGUARD FMFM50 is not just another frequency converter but a complete FM receiver with outstanding performance. Check the following features and see why it's the best, Collins IIF filter for separating those closely spaced stations you hear together on other sets* Double conversion to eliminate interference from image frequencies* Dual Gate MOSFET RF stage for low noise, .2 uv. sensitivity, and minimum cross modulation* Automatic squelch for eliminating noise* Self-contained speaker*...

Qrpwajbn

64 Ground Support for the Powder Puff Derby W7ZC 73 Coax Adapter VHF to 74 The SJy 80 Three Unrelated Installing the Swan 250-C Noise Silencer Measuring Rf Output Useful Cable Clamps 83 -Wave Top-Loaded Mobile 86 11 Element 2 Meter Circular 9 dB forward gain. 92 The For 10, 15, & 20 meters. 97 73 Tests the Grundig Satellite Receiver.-.- Tunes in CW, SSBf FM, and everything 104 De-RF Your 105 Getting Your Extra Class License Part XVII 117 Special Antenna Catalog Section For your reference...

R

We have in stock over six million crystals which include types CR1A AR, FT243, FT241, MC7, FT249, HC6 U, HC13 U, etc. Send 104 for our 1970 catalog with oscillator circuits, listing thousands of frequencies in stock for immediate delivery. (Add lOtf per crystal to above prices for shipment 1st class mail 15 each for air mail.) Special Quantity Prices to Jobbers and Dealers 2+00B Cryitil 0fl4 Ft. Mytri, Fit. SMI

Radiation

Two-eJement antenna spaced J4A and fed 90 out of phase (AJ automaiicaNy becomes spaced 180 out-of-phase array (B) on second harmonic Frequency without changing feediine lengthsl other antenna the secondary antenna. Figure 1(A) shows the antennas separated by A, The transmission line to the secondary antenna is chosen so that it is V4K longer or shorter than that going io the main trap antenna, depending on the direction in which the main radiation is desired. Fed in this manner (90 or...

Radio Amateur

B. 925 Sherwood Drive Lake Bluff, III. 60044 With nothing more to go on than a note in Gu DX bulletin to the effect that King Hussein of Jordan had been heard on the bands fighting off tremendous piles of QitM, 1 sent a cable to him asking if he could use some help for a few days to beat down the multitudes. With Radio Today just being started and the tight U.S. economy making its pinch felt all too clearly on 73, I wasn't really too enthusiastic about my proposal. On the other hand, the...

Send

30, count 'em 30, stupendous tremendous (more handbooks than magazines) fascinating enormous devastating incredibly enervating back issues of 73 Yes-,.yes yes here is a golden opportunity to blow your mind on 30 back issues of 73. You send us 6 in negotiable securities cash or check and we will send you an unbelievable miscellany of thirty different (all different) back issues, alt from the 1960-1966 era. These are all rare collectors items. Every one could likely be worth a fortune to you. Who...

Signal

No suckout or loss is noted on either receiver, regardless of what band either receiver may be tuned to. In fact, no difference in S-rneter reading or audio level can be detected from the antenna straight into the receiver or through the toroid. One caution If two different makes of receivers are tied together, some loss may be noted, i lis occurs because of the differences between the two input circuits of the receivers, and it can be corrected by varying the turns ratio of...

Single Band Model

For maximum radiation efficiency, our single band design is the best. If you're a one band operator, or don't change bands very often, this is the model for you. Heavy duty construction is of the highest possible quality. Stainless steel whip has Kwik-on connector for easy removal. Each coil has a similar Kwik-on connector, also for easy removal and stowage. Power rating is 2000 watts P.E.P. Heavy duty base sections of various lengths permit choice of deck or bumper mounting. , Top section, 5...

Spring Brings Hash Of Ham Tragedies

In Costa Mesa, California, 20-year-old Laurence Bandiera (call not known) was electrocuted when the antenna he was erecting fell against a high-power line. Policemen who were called to the scene said thai band era's neighbor, Merrit (iirgis, was helping with the antenna when it began to topple, Bandiera, tiirgis tolil police, tried to hold the antenna as it fell against the wires. Attempts to revive Bandiera were futile. Word-of-mouth reports from sales personnel at Radio Products Sales Co, in...

Supports

TrnnTTrTrrcrira i i i m imi u m i i ' I. . ' 11 w The modification consists of adding a thumbscrew drive for slower, smoother tuning. First, solder the plunger rods to a brass plate. To this solder a vertical support topped off with a hex net 4-40 or 6-32 is all right. Fashion three supports with holes high enough to pass a threaded rod parallel to the base. Solder a hex nut to a 4 in. threaded rod as shown. 1 bread it through the plunger nut, then align the supports and fasten them to the...

This One Will

AND IT INCLUDES A PANASONIC PORTABLE CASSETTE RECORDER Practice receiving with pre-recorded cassettes Practice sending with the built in code practice oscillator By recording your own sending, you will be able to spot flaws and errors that would ordinarily be overlooked When it is not being used for code practice, the recorder may still be used around the shack and for genera entertainment purposes The system comes complete with a 1 hour pre-recorded cassette (specify speed), a 1 hour blank...

To Try For Your General Class Ticket

STUDY INSTRUCTION LEADING to GENERAL ADVANCE and AMATEUR EXTRA LICENSE different way in the controlled rectifier, in general, though, a gassy tube must be replaced. When a tube does go gassy, it usually lets you know immediately by glowing bright blue. This blue glow is produced by the gas ionizing under the impact of the electron stream, and is the most obvious visual indication of gassiness. However, not all tubes which show a blue glow are gassy. If the glow is only at the inside of the...

Twx

As this view of the unil with its cover removed shows, the vfo can be attractively packaged within a very small volume. Power is furnished to the unit from the transmitter, If no external power11 connector is provided on the transmitter chassis, it can normally be installed with little effort, As this view of the unil with its cover removed shows, the vfo can be attractively packaged within a very small volume. Power is furnished to the unit from the transmitter, If no external power11...

Um

And they provided a reliable and almost continuous flow of intelligence in a 12-station relay back and forth across the U.S. Time was when the word relay was synonymous with amateur radio. Today> there is little or no relaying being done except on established traffic nets. Another facet of old-time ham radio has all but vanished the requirement for total accuracy in the passing of information from one station to another. All thinking people know what happens to word-of-mouth messages...

Vanguard Labs

The faults were reflected in the readings observed on the indicator unit a situation which would not occur with a fairly long transmission line. Some of tiie faults created were observed on the indicator unit as even a slight improvement in swr as when metal foil was wrapped around portions of the transmission line or antenna to simulate dielectric condition change. But, the foil probably acted in some manner to improve matching conditions, such as a stub would. The important...

W Au

BIG SIGNALS DON'T JUST HAPPEN GIVE YOUR ANTENNA A BREAK Comes in 2 models. 1 1 matches 50 or 75 ohm unbalanced (coax line) to 50 or 75 ohm balanced load. 4 1 model matches 50 or 75 ohm unbalanced (coax line) to 200 or 300 ohm balanced toad. AVAILABLE AT ALL LEADING DEALERS. IF NOT, ORDER DIRECT 1. HANDLES FULL KW INPUT THEN SOME Broad Banded 3 ro 40 Mc. 2. HELPS TVI PROBLEMS By Reducing Coax Line Radiation. 3. NOW ALL STAINLESS STEEL HARDWARE. S0239 Double Silver Plated. A. IMPROVES F B RATIO...

Waffj

73 Magazine is pubtished monthly by 73< Inc., Pine St, Peterborough, New Hampshire 03158. Subscription rate 12.00 for three years, 6.00 for one year* Second Class Postage paid at Peterborought New Hampshire, and at additional mailing offices. Printed at Pontiact Illinois, U.S.A. Entire contents copyright 1970 by 73t Inc., Peterborought New Hampshire 03458, Winner Flown to K7UGA Residence by Helicopter Over the past seven or eight years, John Bjichanan, a Tucson ham YH1 -KM radio operator, has...

Wazha

Wetolte* Lapel Bar- 1.50 Metolfe* Tie Clip-52.25 it receives without concern to whether or not it was sent by a member. Doesn't that seem reasonable. James M. Szot WB2VVZ 423 Lord Street Dunkirk NY 14048 It certainly does seem reasonable. Bui have you any particular reason for believing the ARRL reads all the mail it receives wiihoui concern to whether or not it was sent by a member I have proof positive, in case after case, that this is simply not the way it really is. And why do you equate...

Woodside Research Co

BOX 276, YARDLEY, PA. 19067 PHONE 215-493-5850 Snoopy on Louise White's Mooney Super 21 might have had a rough ride, but pilot Louise looks cool and relaxed after arrival at Dulles a ihough ihundersrorms plagued the last half of the race route. K7UGA Harmonic. -AH hail the happy winner of the 1969 Powder Puff Derby.as Congressman Bairy Goldvsater. Jr. hands her the trophy at the awaids banquet held at Alamort Twin Bridges Hotel, Virginia, The race is open to all qualified women pilots flying...

World

Put my name in ypur eternal file and send me the I enclose 10 and agree to pay S8.80 each month for the next 5 months. I enclose S50 cash. Don't forget to send my free Deluxe atlas (U.S. only). I am a Stuntman .1 am test pilot J am a bomb disposal man Other I already subscribe, and hereby extend till death usiio part. I am not already a subscriber .Other Send to 73 Magazine, Peterborough, N. H. 03458 with an external nylon sleeve this was to prevent irregularities in...

World Qsl Bureau

5200 Panama Ave., Richmond CA USA 94804 PLAN KWe forward your QSLs (pleas f arrange alphabetically ) to or within USA, Canada And Mexico for 34 each and to all other places in world for 44 each, PLAN 2. You use our special Joe form and st-nd us a copy. We supply QSL-make out QSL-deliver QSL, al for fttj e.ich. 2538 ACQ.-COST METER FOR S75 AN URM-79 IFR-4 U in Transit Case) 100 khz to 20 mhz, 7 bands, each 50,000 dial di . +001 3ccur(( .0001 stabil. Measures & Emirs, Builr n AC sply, scope...

Banquet

On Saturday, October 10, 1970, the Radio Association ot Erie will be holding its annual dinner banquet. This is our 25th year of serving the ham and community, having been founded in 1945. A part of oui program features the giving away ol door prizes which are donated by local stores, as well as various gear from manufacturers and distributors. The Radio Association of Erie would be honored to have coin-panics represented at our dinner and V3GV would be happy to distribute I he literature and...

Herbert W Gordon Company

The model FE20 Hi-Lo multimeter checks conductivity of transistors, diodes, and rectifiers with a flip of the function switch the ohms scction is powered with a lower voltage (below the conductivity point of solid-state devices). Resistances can then be measured in-eircuit for true values without solid state device conducting and causing erroneous results, Both Hi and Lo ohms are read on the same scale to avoid confusion. Other features include a tenth of a volt full scale for more accurate...

We impressed

The Brute stopped in the other day and showed us Raytrack's Red Line Series. Now we know why these amps are called the Brutes. 1000 watts PEP AM, CW, RTTY Two El MAC 3-500Z Zero Bias Triodes Adjustable ALC Network Designed for Continuous Duty Oh yes, the Brute also dropped off a

Look At These Unparalleled Features Not Found On Any Other Deck Of Us Manufacture At Much Higher Prices

STOP-START Full speed attained in less than 0.5 sec. DRIVE CONTROL Single rotary control for all functions. Interlock prevents tape breakage, stretching and spilling when changing mode of operation. BRAKES Mechanical braking eliminates need for adjustments. WOW AND FLUTTER Less than .25 at 7.5 ips .3 at 3.75 ips. DIMENSIONS AND WEIGHT 10 5 16 x 14Ya x hV, Below panel, VA above panel. 14 pounds. REEL AND TAPE SIZE 7 max. reel, V. tape. HEADS Record playback staggered two track sterio, dual...

Amrad Supply

Central California s Most Complete Amateur Rad o Shop, See Arnrad for the Finest in Service, Equipment, and Supp tes. 1000 watts PEP AM, CW, RTTY m Two El MAC 3-500Z Zero Bias Triodes Hybrid Tank Circuit Raytrack's own unique Toroid and Air Inductor Combination Rugged, Separate, Heavy-Duty Solid-State Power Supply fresh stock of Raytrack's world-famous in Speech Compressors. 1025 Harrison St. Oakland. California 94GQ7 Phone 415 451-7755

Learn Radio Code

As for the before the examiner jitters, I can recall when I got my General ticket the FCC examiner refused to allow a blind fellow to use a typewriter for the exam. He made him write it. The examiner then flunked him because he couldn't read the writing. I also recaJl a friend of mine who had gone with me to take thai test. He was so nervous that he could hardly hold on to ins pencil. In both cases, both were qualified but for different reasons unable to perform before Big Brother. Fortunately...

Radio Shack And Allied Join

Form Multimithon Dollar Retail Merchandising Firm Allied Radio, one of the most popular sources of ham gear in years past, has just been acquired by Tanety Corporation, parent firm of the multi-outlet Radio Shack. The result is a total chain of more than 700 electronics department stores in 48 states. To kick off the new association, all Radio Shack stores will display Allied catalogs. In time, the individual stores are expected to stock a large percentage of Allied's 30,000-item line* For the...

Model Ca

All things end, the philosophers tell us, and this installment brings our study course for the Extra ( lass exam to its close. All we have left from the 90 questions on the official FCC study list are a half-dozen miscellaneous items covering a number of relatively minor but nevertheless important points. The official questions which remain for us to examine are 47. What useful functions does a balanced modulator perform in a radio transmitter 69. What is a third party agreement What countries...

Hams

Proved ability to tolerate ali sorts of differences of opinion. We do not require the sort of conformity which would guarantee our leaders a type of authority minus checks, balances, or criticism. Our country is the best on earth because of this apparent contradiction not in spite of it And when we forsake this fundamental principle, that is the day wc will begin to deteriorate into something less than the best. The drive toward conformity ot ideas, ethics, morals, dress, manners, standards,...

Full

GT-550 80-10m Transceiver 550.00 AC-4O0 1I0 230V AC Supply 99.95 G-1000 DC Supply 129.95 SC-550 Speaker Console ____ 29.95 PR-550 Phone Patch 49.00 CAL-25 25KHz Calibrator 25.00 F-3 300Hz CW Filter 37.50 R-530 .5-30MHz Receiver 795.00 SC-530 Speaker Console 45.00 FL-5305 500Hz Filter 45.00 FL-53015 1.5KHz Filter 45.00 FL-53D6 6Hz Filter 45.00 FM-210 2m FM Transceiver 200.00 AC-210 AC DC Booster 39.95 To AMATEUR ELECTRONIC SUPPLY 4828 West Fond du Lac Avenue Milwaukee, Wisconsin 53216 I am...

Tp

This advanced state-of-the-a ky Needle is fast earning i .m special place of hdnor in tfu am-communications field, Tri-Ex akes great pride in being the eveloper and first to build this tow * for thfe amateur Uniquely eye-pleasing, the slim and graceful Sky Needle is a symbol of pride to its owner as well as proo delivery. Act now Write for free brochure, today. * Three Hi-Gain 10,15, 20m long Log-periodic antenna for mars u 13 to 30 mMz. 7182 RASMUSSEN AVE.IVISALIA, CALIF. 93277 ANTENNAS WITH A...

Magazine

20 A Practical DDRR Expensive, difficult-to-buiid mediocre antenna. 36 VFO n case you are tired of crystal control. 39 The Low-Noise 41 Experimental Remote SWR Experimental means we thiink it might work. 46 The Little Wonder Mark Proving again that almost anything will radiate, 48 CW Can Be Fun (With the Ord DK 49 Two Receivers From One 50 Factors in Coaxial Cable 52 Improving Trap-Type Vertical 56 Measuring Incident and Reflected RF VE7BS It's the difference that counts. 58 Government Surplus...

Antenna Stuff

Per 100 feel 4,95 300 chm open wire. Per 100 feet 4,65 St an doff-Mast or Screw-In 18 Copperweid. Per 100 feet S 1.19 14 Copperweid, Per 100 feet 2.95 12 Copperweid, Per 100 feet 3,99 14 Copper-Solid, Per 100 feet 4,29 12 Copper-Solid. Per 100 feet 579 Times 14*50 L Loss fiU. Per foot .18 Times 15-50 L Loss 58U. Per foot 10 Times Solid Sheath Aluroafoam in stock Kits with connectors 50 100 ft Glass Line-guy wire. Per TOO feet 500 lbs Test 3.79 Glass Line-guy wire. Per 100...

Amidon Associates

12033 Otsego Street North Hollywood, Calif. 11607 Wavelength of 0.4 to Lf U. with peak sensitivity at O& fjL They also have a low series resistance of 10-2 max and a maximum total capacitance of 4 pF- Technical Information Center, Motorola Semiconductor Products Inc., Box 20924, Phoenix AZ 85036 The dual four-channel data selector, Fype MC4000, features high speed characterized by a typical propagation delay of 1 I ns from data iinput u> out Hit. The selector consists of inter- nally...

Guaranteed Cubical Quads

PRE-TUNED COMPLETE PRE-CUT PRE-DRILLED QUADS ARE BETTER BECAUSE they have more gain than fiat tops, element for element Are quieter less static and ingnition noise Possess lower vertical radiation angle Require less space 14 width of fiat tops Greater capture nreat so better on weak signals-Negligible corona losses-Excellent S VR FreqT characteristic-Light weight 30 lbs tor 2 el, 60 lbs lor 4 el Detuning less from nearby objects. Your choice, bamboo or fiberglass no aluminum spreaders. Bamboo...

Henry

Olympic Blvd., Los Angeles, Calif. 90064 931 N. Euclid, Anaheim, Calif. 92801 714 772-9200 Butler, Missouri 64730 816 679-3127 I've been dying to taik about New England, and now that the boss is gone, there's no one to stop me, Wayne got an invitation to spend a few days with Jordan's King Hussein, and like a lightning flash he was gone. Now if I can get this editorial into prim before he gets back, Tm home free- The reason I wanted to talk about New England is because I am an...

Beam

Swan Triband Beams feature a patented trap design which permits precision factory adjustment. This results in maximum forward gain and front-to-back ratio from each and every Swan antenna. Their outstanding performance is comparable to single band antennas having the same number of elements. The electrical principals employed in a trap type inulti band antenna are quite simple. The trap is a parallel resonant circuit consisting of a high Q inductance with a coaxial sleeve capacitor connected in...

A V

The next pair must be 3-3 8 in. from the first pair and in line wiili them. On the centerline of one side of the box, drill two holes for 10-32 screws 1 in. from each end. In this last pair of holes, install two 10-32 x 1 in. screws with solder ugs under the head of each screw on the inside of the box. Run nuts onto these screws and tighten them securely. Install the capacitor in the box by slipping the shaft through the large hole in one end and with the mounting bars...

Broomstick

The Mark II uses the basic concept of lhe original 1 ittle Wonder antenna with four exceptions 1 I he hard-drawn copper tubing is now two sections from a discarded polelamp stand 2 the low-Q 197 turns of Nyclad wire is now a high-Q BW 3034 coil stock. 2Vi in. diameter 8 turns per inch and 135 mH 3 the Mark is tapped for the band being used and 4 the antenna can stand anywhere in fhe room due to the pofeiamp construction concept-Construction is simple and all parts can be purchased or scrounged...

Ameco

Reflectoren Merk Ameco

BOX 6527, RALEIGH, NORTH CAROLINA 27608 Fig. 3, The launching end of the sly beam. 10-gage fence wire, each fitted with a wire strainer for easy tensioning. With this arrangement there is no difficulty in obtaining the necessary 100 lb lateral load ability at 40 ft above ground, provided the guy anchors are firmly set. Fig. 3, The launching end of the sly beam. With the arrangement shown in Fig. 1 the two l iber cords are brought together to form a single cord at each end of the antenna....

Fibreglass

Never before has one antenna offered so much The GEM QUAD is a two, three, or four element antenna designed to operate on ten, fifteen, and twenty meters. Forward gam for two element GEM QUAD gives maximum gain on DX, where it counts. Optional third element easily installed has given optimum forward gain with a narrow forward cone of effectiveness, resulting in excellent rejection of unwanted signals. Front to back ratio designed for maximum signal discrimination. Toroid balun kit supplied for...

Zip

Radio Hndbk I I FM Repeater Hndbk I-IBothHndbks I enclose 10 I-11 enclose S6.95 I_11 enclose 15 John J, Schultz W2EEY, 1829 Cornelia St., Brooklyn John J, Schultz W2EEY, 1829 Cornelia St., Brooklyn nventionally placed swr meters often do not indicate the true swr at the transmission line antenna junction. Remote location of the reflected power sensing portion of an swr unit is the key to true swr value indication. athex than using a combined swr indicator and sensing unit in the transmission...

Dave Mann Kagz

1 oaniel lane, kinnelgn fs j 07 lt wb In order to clarify this situation concerning the rules for third party emergency traffic, the FCC District of Columbia Bureau was called. A man named Mr Sam Feiraro gave the caller permission to quote him directly. This is what Mr. Ferraro said Under any circumstances, emergency, that is. life and death traffic, is permissible by the FCC with any country He stated further that the Commission will not prosecute any ham for handling any emergency traffic...

Editorial By Wa Yne Green

The earphones, but still couldn't keep my eyes oft it After a couple of hours wait at London in the passenger lounge I was off again to Beirut. Vd written Bob OD5BZ there, hoping he would have time for dinner between my planes. Late that afternoon I arrived at Beirut, but no Bob-1 found out later that he was out of the country on business. put away a great Arabian meal at the airport restaurant and continued on to Amman on a Rova Jordanian Airline plane, landing there about 9 30, wide awake on...

U Multiband Beams

CL-36 for 10, 15, and 20 meters 1 KW FORWARD GAIN Compared 'scenes dipole 0 10 meters - 9,Gdb on 15 and 20 liters 0.0 c ti O r isotropic source on TO fliers 11.1 db cm 1 5 and 20 matters 10,1 dtx Mosley Electronics, Inc., announces the latest addition to the rap-Master line of amateur radio antennas, the Classic 36, a six-element tri-band beam incorporating the famous Classic Feed System, Balanced Capacitive Matching U.S. Patent No. 3419872 . Classic 36, rated for maximum legal power on 10, 15...

Trap vertical

Q, 15, 20, and 40 meter operation, with provision te for 75 meter add on Kit. The Swan model 1040 V Trap Vertical has a low angle, nondirectional radiation pattern, making it the idea an tenna when a larger array is not practical. It can be installed at ground level, or on a rooftop, The high Q patented traps have the same adjustable design as the Swan triband beams. Precision factory tuning results in maximum radiation effi ciertcy on each band, with low SWR across the entire band. Power...

Write For Free

Note that in the above examples only one depress-release cycle of the dot and dash keys is required. AJJ letters, numbers and punctuation marks may be generated using variations of this technique From Distributor or Direct from Factory 3201 HANDLEY EDERViLLE RD FORT WORTH, TEXAS 76118 817 268-1611 ition during these first two long days of this hectic communication problemProblems The weather was bad in the midwest and cast as the third day began. Severe storms raged over all the route east of...

Tristao Tower Co

The 11-element version of the long circular quad is designed for operation on 144 MHz up to about 146 MHz. Measured horizontal forward gain showed 15 dB gain over a dipole. Front-to-back was 21 dB for the horizontal pattern ratio and not the vertical directivity of that pattern and 1 measured 9 dB over a dipole for the vertical forward gain, and 12 dB vertical frbnt-to-back, Measurements were made on the linear scale of the SX-122 S-meter that was modified for elimination of contact-potential...