Notice Of High Import

While we have had to reluctantly inch our subscription rates up just a hair, we have managed a real coup for you, the dedicated reader We have nailed down, for the time being, our three year subscription rate. Take advantage of this obvious oversight. Sock it to us* Gold is up, silver is up, the pound is down. * . . we warned you. This is a good deal. We shall say no more. r m ---- J. j. A, - - BAB m m. -M- a. - > -

Ago Control Line

Block diagram of two stage if strip (typical). The amplifier blocks in Fig. 3 may be occupied by tubes, transistors, or any other active device (such as field-effect transistors, etc, which can provide gain. In general, the amplifiers provide the gain while the transformers provide the selectivity. Normally, most receivers incorporate automatic gain control for AM signals at least, Tliis is a feedback action which employs a dc voltage developed in the detector circuit to control the...

All Types

WIRE, WRITE, PHONE COLLECT WE PAY FREIGHT ON ALL PURCHASES 548 Broadway, New York, New York 10012, Phone 212-925-6000 RCAF GB-10 195-410 KC & 1,4-31 MC, Used, Checked 599,95 BC-603 20-27.9 MC PM Receiver with sensitivity md squelch Us& d, Nol Chft& ed .-522,95 Used. Checked Tor op, S32.95 BC-34S Receiver 00-500 KC and 1,5-lg MC w Crystal Phasing BFOt ant Vernier Tuning. A VC, irVC. Prices Used, less Dynarootor 69.50 Csed, less Dynamotor, operation checked

Am Cwssb

200 watts per tube 400 watts per tube To check for parasiticus (there shouldn't be any in this amplifier, but just in case) load the amplifier on 10 meters. After loading (into a dummy load of course) remove the excitation, then rotate the plate tuning capacitor (C5) 1.80*, here should be no variation in the cathode current without excitation. By now you may have noticed a residual current of 20 to 30 mi hamperes in the cathode circuit, Don't worry about it, that's natural for this circuit If,...

Ant

There have been many articles published over the years describing converters to extend the range of otherwise satisfactory low frequency receivers, This article does not present a unique design, but rather a successful combination of previously published circuits which, taken together, have the advantage of simplicity, dependability, and easy adaptation to a wide range of frequencies and a variety of applications. If we consider the requirements for a good rf amplifier, it should provide...

Cali Direct Use Area Code

Butler, Missouri, 64730 Sift 679-3127 11240 W. Olympic, Los Angeles, Calif., 90064 213 477-6701 931 N. Euclid, Anaheim, Calif., 92801 714 772-9200 More and more UFO investigative groups have been getting the word about the amateur radio UFO net and have been writing to find out about amateur radio activity in their vicinity which might tie in with their work. We certainly have struck a spark at the right time with this activity. The first announcement of an actual net frequency and time was...

Cranked Down

Clippers, lor fixed station installation, have gone out of style in recent years, being replaced by compressor amplifiers. However, for mobile installations with AM or FM transmitters, they are st II very appropriate. This article presents a particularly compact and simple, but effective, copper circuit for the mobile operator. Clipping circuits no longer find much application in home stations because of the use of SSB. Although the amplitude of the harmonics generated by diode clippers...

Delivery Time

SPECIFICATIONS International Type EX Crystal is available from 3,000 KHz to 60,000 KHz. The EX Crystal is supplied only in the HC-6 U holder. Calibration is -02 when operated in International OX circuit or equivalent. CONDITIONS OF SALE All iJEX Crystals are sold on a cash basis, 375 each. Shipping and postage (inside U.S. and Canada only) will be prepaid by International. Crystals are guaranteed to operate only in the OX circuit or its equivalent

Diode Circuits Handbook

Covers rectifiers, meter circuits, miiters, detectors, modulators, products, FM detectors, noise limiters, squelch, AGCH BFOVQ-multiplier, xstr protection, AFC, Varicap tuning, audio clippers, FM modulator, balanced mods, Yarac tor multipliers, f i e I d-s t r on 91 h meters, v avemeters, RF probes, dummy loads, SWR bridge, tachometer, noise generator, square-wave gen, leners, control circuits, voltage control, etc. Ill different circuits.

Double Button Thread

I note author Tani C. Allen, WA41IRX, refers to my article on book binding in Dec, 66, 73, I have since made a great improvement that I think will prove useful to anyone following my system. Instead of punching holes in the magazines, and mutilating them until I have a years supply, I start the sewing process as soon as I receive the second issue. When I receive the 12th issue, I have a firm hook ready to be mounted between covers. In the meantime 1 have a sturdy book for ready...

Electronics

OCEANSIDE, CALIFORNIA A Subsidiary of Cubic Corp Recently, when confronted with the problem of operating a surplus vacuum tube receiver from the automobile supply, it was decided to use a transistorized inverter circuit to supp'y approximately 300 vdc at 50 or 60 mA, After a search through a reasonable amount of literature, i discovered a serious drawback to transistor inverter circuits- fhe most usual case is one in which an elaborate transformer (usually having five windings) is used in. a...

Everything Unconditionally Guaranteed

SI LLC, RECTI F, 8000 PIV 400 MA, Laree user's termin, invent., not rejects Slater RI.A03-2. Mas reverse, 2 uA fwd drop, & > v. Cost 8 ea. PAIR postpaid 5.30 Brand New VHF revrs look lite BC-453 Command but. are 9-tube 10ft-135 inc. 2 uv sens,, 2 TS IF's noisii Imtr avc. w scheni. , instruct., spline knob, & graph to set freci. by counting turns. A.R.C. Type 13B, 2Sv htr wiring 7 shpg. wt 27,50 R-23 ARC-5 Command revr 190-550 kc Shpg. wt. & 14.95 A.R.C. 12 22 Command revr 540-1GG0...

For Closed Circuit Or Amateur Tv

THE VANGUARD 501 is a completely automatic closed circuit television camera capable of transmitting sharp, clear, five pictures to one or more TV sets of your choice via a low-cost arrtenna cable (RG-59U) up to a distance of 1000 ft. without the need for accessories or modifications on the TV sets. The range can be extended indefinitely by using line amplifiers at repeated Intervals or by using radio transmitters where regulations permit* There are hundreds of practical uses in business, home,...

Fourth Annual Long Island Hamfest

Sponsored by the Federation of Long Island Radio Clubs Inc. A day out for the entire family. Swimming, Sunbathing, Playgrounds, Boardwalk, Barbecue Grills, Tables for PlCNfCING GAMES * AWARDS CONTESTS * AUCTION SWAP SHOP * MOBILE ACTIVITIES Hempstead Town Park, Point Lookout, Long island FLIRC, P.O. BOX 3tW* Urw Beach, N.Y. H56I Made In USA. COMPLETE WITH LENS sub-miniature solid state TV CAMERA

Free

20,000 ohms per volt V-O-M, Ohms IK, 10K, 100, 1M Volts dc 2.5, 10, 50, 250, 500, 5000 volts ae 10, 50, 250, 500, 1000 < 3e mA .05, 5, 50, 500 db 0, 14, 28, 34, 40. Invaluable around any hamshack or workshop. HERE'S THE DEAL, These premiums are for getting new subscribers for 73, not renewals. You, knowing 73 as you do, can sell it a lot better than one of our mailing pieces, You won't get lost in the daily deluge of mail solicitations and the credibility gap that they have wrought. You know...

From Detector

Fig. 5, Diode in series with AGC line provides fast-attack slow-decay action for use with SSB and CW signals. Waveforms produced by CW character **Rn illustrate the action. (Then detector voltage goes negative at start of each code element. capacitor voltage follows almost instantly. When detector voltage goes positive* diode cuts off and only discharge path for capacitor is the high-value resistor shunting it. This permits AGC control voltage to rise toward ground level, but much more slowly....

Xfz

While you are at it you might as well order some of our nice books listed above. Also it wouldn't huit to get a S3 binder or two. And remember, 73 now costs a lousy 26.28 for three years on the newsstand. Appalling. Some hams prefer to receive with a good loudspeaker or crystal headphones, rather than with those of limited frequency response. When this is done, 60-cycle and 120-cycIe hum can be much more evident The problem is to cure the hum. In the Swan 350 and 500, the audio line also is...

Index To Advertisers

ATV Research, 33 Allied Radio, 49 AIITroriics* Howard. 04 Amcto Aerotron), 13 Amidon, 49 Artturus, 94 Arnold Engraving, G8 BC Electronic , 91 B 4 f Enterprises, 09 Bigetcw, 90 James, 38 Jan Crystal, 90 Jeff-Tronics, 91 Radio Club, 41 Liberty, 96 Lewispaul, 89 Editors and Engineers, 15 Epsilon Records, 39 Evans, 45 E-Z Way, 31 Gateway Electronic , 92 Gateway Tower, 39 Global, 90 Hnfstrom < 8X1). 39 Haydan, 93 Henry, 3 Hunter, 27 Rcdilne *iG, 47, Cover IV Ritco. 92 Sound History, 40 Spate...

Info

Of action to put into effect when needed may head off real trouble. After hearing reports and settling old and new business, the president can turn the spotlight on the program chairman and enjoy what follows, Hes not completely out of the work harness, however, since adjourning the clambake is also his job. When the program is over and the discussion dies down, he closes the meeting officially. He can ask for a formal motion of adjournment, or if coffee and cookies are on the menu, he might...

Msv

Burned out pilot lamps are annoying, particularly so when equipment has to be disassembled to gain access to bulbs which is the case with my Heath HW32A transceiver. After a couple of disassemblies, I decided to eliminate the problem once and for all. A 200 volt, ampere diode (because it was available) was inserted in place of the jumper wire that connected the two IIW32A lamps in series (the diode operating as a rectifier eliminates one-half of the ac wave, thus, causing half normal voltage to...

Jth Edition Of The Famous

Tells how to design, build, and operate the latest types of amateur transmitters, receivers, transceivers, and amplifiers. Provides extensive, simplified theory on practically every phase of radio. Broadest coverage all original data, up-to-date, complete. 848 pg. Order EE-167, only 12.95 Order from your electronic parts distributor or send coupon below. P.O. Box 68003, New Augusto, Ind., Dept. 73-38 No. EE 65060 No. EE 031 EE-350 Fig, L The *sandwich1 as seen from the side. Fig, L The...

Kvyq

Circle and the first one would whisper a sentence into the next person's ear. By the time the sentence reached the last person, it was completely different. On the ham bands one person would report the actual fact that Alan Biggs' boat had taken on water and they had asked for aid from the Coast Guard, This would be passed on as Hey, did you hear that Alan Biggs is lost at sea and is sinking. It was, unfortunatelyj the wild exaggerations which reached the newspapers, Ham radio can do a lot of...

Leu Than Half The Timb

So your dealer nowl 206 Eact Front Street* Florence, Colorado sell your work for you, it will almost certainly assure thai you get a reading. Here are some of the requirements for creating an attractive package, as applicable to all publishers Type your text double-spaced on white typewriter paper (20 bond), leaving 1 inches of margin space on the left and no less than an inch on the right. Avoid typographical errors, typeovers, and messy corrections as much as...

Maximum Radiation

Fig, L TAe spacrrcg 5 distorted to make clear how the two collinears are fed. The half-turn in the connecting line is vital But make sure it is in one side only. Fig, L TAe spacrrcg 5 distorted to make clear how the two collinears are fed. The half-turn in the connecting line is vital But make sure it is in one side only. There are undoubtedly many hams who would like the gain of a beam or a quad in their shacks, but cannot convince XYL> landlord, or neighbors of the wisdom of their desires....

Meter Single Sideband

THE TV-2 IS A TOP QUALITY RECEIVING AND TRANSMITTING CONVERTER FOR THE 2 METER BAND DESIGNED TO OPERATE WITH SWAN TRANSCEIVERS, MODELS 250, 350, 350-C, 400, 500 AND 500-C. 14 MC INTERMEDIATE FREQUENCY IS STANDARD, HOWEVER ADDITIONAL CRYSTALS MAY BE ADDED AND SWITCHED IN FOR OTHER PORTIONS OF THE 2 METER BAND. THE TV-2 MAY, OF COURSE, BE ADAPTED TO OTHER TRANSCEIVERS ALSO. PRICE 265,00

Military Test Equipment Data Handbooks

Published 1961 by Fredereick Research Corp, Vol. 1, Volt Current Meats- Equip. Vol. 2. Freu, Mens. Equip- VoL 3. Waveform (Oscilloscope) Equip, Vol. 4. Signal Gen. Equipment. Four Bound Book* (10 ponntls) NEW. 5.50 postpaid, payment vp order, We Also buy for Cash, Surplus Testatus, Transmitters, Receivers, Etc, Especially Airborn Collins. RITC0 Electronics, Box t56, Annandale, Va. 22003, Phona 703> 560-54& , THE COMPLETE HAM STORE WHERE YOUR DOLLAR BUYS THE MOST All leading lines of...

O Dsb

Here is a simple way to convert any AM transmitter using two tubes in parallel in the output stage to double-sideband suppres-sed-carrier operation. This conversion is simpler than others I have seen in that the original single-ended grid and plate tuning circuits are used, with only minor changes to be made in the grid circuit. Basically what is required for double-sideband suppr essed-carrier operation is a push-pull rf grid circuit with a parallel rf plate circuit, Fig, 1(a) or a parallel rf...

O Output

Rat e-of-change type of limit cr uses diode switch to open audio path whenever noise pulse is present. Stumps as well as peaks of noise pulses arc removed. Major difference in operation from Fig. 7 is characteristic of control voltage filter, see text. Fig, 7. Rat e-of-change type of limit cr uses diode switch to open audio path whenever noise pulse is present. Stumps as well as peaks of noise pulses arc removed. Major difference in operation from Fig. 7 is characteristic of control...

Of Sections In Each U

Notice the shield which isolates the output section from the rest oj the circuit* Bottom view. Notice the shield which isolates the output section from the rest oj the circuit* glow of the plates. However, I prefer to use an output indicator such as an SWii bridge or a monitor scope. Adjust the plate tuning capacitor (C5) until the output indicator reads maximum, then adjust the loading capacitor (C6 until the output indicator again reads maximum, Switch in additional capacity (C7,...

On for

Steve Rock lFAiYVQ 4 4474 Lauderdale Ave. Virginia Beach Va. 23455 About a year and a half ago I felt a great desire to operate on 20 meters. Verticals and dipoles were tried with disappointing results. Several types of homemade beams were tried, but they either didn't work as advertised, or fell prey to the weather, After much frustration I tried a ZL Special. Kot only was this antenna a fine performer, but it was also very inexpensive to build, and it withstood the weather very well. Using...

Percent Of Current And Ught Output

Note that light output will drop to 54 percent and lamp life will increase to 1000 percent. To check the effect on current by decreasing lamp voltage, continue the horizontal line across until it intersects the dotted line representing current. Draw a vertical line Irom this point down to the bottom scale, and see that current will drop eight percent. Since I have reduced lamp voltage by 50 percent, my previous statement that I d fix the lamp problem 'once and...

Preamps

To 175 Mhz. 19.95 ppcL to 300 M hi- 23.95 ppd. to 400 Mhz. 27,95 ppd, to 450 Mhz. 31.95 ppd. Available from 5 MHi, to 450 M Hi. Bandwidth is approximahely 5 of frequency. m Two Dual Gate MOSFET a m pi fier stages w th each having a tuned input and tuned output. Each Dual Gate MOSFET s actually an integrated cascode circuit thus giving you 2 cascode circuit* equivalent to 4 triodes. Exceptionally low noise (2.5 DB at I75MHi ), greatly reduced cross modulation and 10 times the dynamic range fs...

Prizes For Subscriptions

25 TEN-IN-ONE MINI LAB FREE WITH 5 NEW 6 SUBSCRIPTIONS Volts ac & dc 15, 50, 150, 500 Ohms 10K, 00K, 1M mA 500 100K, 1M Capacitance substitution .002, .005, .02, .1, lOuF RF field strength 9V battery supply RF signal generator at 455 kHz to 700 kHz AF generator at 400 Hz. Comes with test leads, antenna and battery. Invaluable for mobile servicing or around the shack.

Rca Dual Gate Mosfets For Both The Rf And Mixer Stages

The performance and features of our new converters are so spectacular that they can only be fully described in our new illustrated catalog which Is available FREE. Send for it today and see our entire line of converters, ore-amos and other communications equipment, VANGUARD now makes the best converters. Buy one and be convinced.

Renewal Code

The two numbers under your call on the dress label are the expiration code. We -tried to make t simple. The first number is tl month that we send you the last copy on your subscription and the second number Is the ye 78 would be July 1968, for example. A Two Dollar Phone Patch Philip L. Writer W6TRU 5226 Vickie Dr. San Diego, Calif. 92109 Again and again yon have heard it's cheaper to buy it ready made, or as a kit . . . This statement has been applied to just about anything you find around the...

Space Age Keyer

Planar epitaxial integrated c rcu fs for reliability. No tubes No separate transistors, Precision feather-touch key buiff-im Fully digital Dot-dash ratio always perfect No polarity problems Floating contacts switch 1-amp. Rugged solid construction will not walk, Send QSL or postcard for free brochure. For a long while I've been plagued with having to manipulate my band Switch on the 75S-3 whenever I wanted to work DX which was transmitting in the foreign phone band while I transmitted in the...

Subscribers

We want to make absolutely sure that no one is using our 73 mailing list. We do not rent this list out as do other magazines. If your address label from 73 is distinctive and you find that you are qettingi any mail addressed in the same distinctive way please let us know immediately and send us the envelope or wrapper that you received so we can take appropriate action. Your help in this will be very much appreciated, l I t-v -j l I t-v -j WHAT IS THE BEST ANTENNA HEIGHT FOR DX'ING 70 feet for...

Swan C Ssbamcw Transceiver

Five band, 520 watts for home station, mobile and portable operation. The new model 500C is the latest evolutionary development of a basic well proven design philosophy. It offers greater power and additional features for even more operator en* joyment, Using a pair of the new heavy duty RCA 6LQ6 tetrodes, the final amplifier operates with increased efficiency and power output on all bands, PEP input rating of the 500C is conservatively 520 watts. Actually an average pair of 6LQ6rs reach a peak...

Teninone Minilab

Here is a complete test laboratory all in one package A modern miracle of electronics. This one unit contains an AC-DC Voltmeter 50, 150, 500 volts 0-500 mA 10K, 100K, 1M ohms resistance and capacitance substitution 9 vdc battery supply RF Signal generator 455 kHz (and up to 700 kHz) plus an audio generator at 400 Hz. You can service just about anything with this lab. You can signal trace and align receivers and trace audio systems, speech equipment, hi-fi and tape recorders. This is probably...

To Bias

Fig, 3- Terminating resistors for A. wait range using 52 ohms, and C Exciters under 100 watts using 100 ohms, B. Exciters in the 200 Exciters over 200 watts using 26 ohms. wired up as choke input. I needed more voltage so a 2 mid 2000 volt filter condenser was placed from B plus to ground ahead of the choke. With condenser input I got 840 volts to get my required 810 volts as per the data sheet. However when 1 tried to get regulators totaling 810 volts (4-VR 150 and 2-VK 105 in series), I found...

To Exciter Alc Input

L The basic circuit of the amplifier. Note 1. Grid resistor load. Note 2, Mica condenser any size. 01 to ,002 voltage is loiv, JVoie 3. MmonaZ R 100 e> r e tea 2.5 mH. Note 4. SwfrcA or adjusting power output of exciter to proper power input to amplifier. See text for details. load. Most exciters are made to operate into 52 ohms, and I feel it is only sensible to follow along with the designers plan. Terminate n resistance as high as 100 ohms can be used without the linear becoming...

Transistor Tone Oscillator

Do not confuse this wellmade military unit with low price commercial ice cube packs,'1 This unit operates from 1.5 to 6.0 volts,, and has transformer isolated output. Frequency is 000 _ Hi, may be varied with external pot. New package, and complete with spare set of transistors, Applications Continuity, component, and semiconductor tester, code practice oscillator, keying monitort alarms, RTTY SHIFT Oscillators, etc. Price 2.00 Postage Paid. TTC 2,00 P.P. 101 New packaged spare parts for models...

Used Model Tv Cameras

H( 19A-23 Jamaica Av*.t Hollis, N.Y. U423 Over 283,000 QTHs in the U.S. edition 135,000 QTHs in the DX edition I 4,95 These valuable EXTRA features included in both editions See your favorite dealer or order direct (add 25 for mailing m U.S,F Possessions & Canada. Elsewhere add 50C), Dept. H( 19A-23 Jamaica Av*.t Hollis, N.Y. U423 Over 283,000 QTHs in the U.S. edition 135,000 QTHs in the DX edition I 4,95 These valuable EXTRA features included in both editions See your favorite dealer...

1

L Circuit of the preamplifier clipper circuit. Potentiometer adjusts clipping level and may he replaced by fixed resistors once desired level is found. turn, glued on each corner to the microphone enclosure. The power for the amplifier can be supplied in any one of several ways, A miniature battery might fit in the particular microphone used and could be wired to extra contacts on the push-to-talk switch, so the clipper is only energized during transmit periods. The power can also be...

Vanguard Labs

Census of Radio Amateurs throughout the world Radio Amateurs' License Class World Prefix Map International Radio Amateur Prefixes Radio Amateurs1 Prefixes by Countries Each month we have a limited number of used TV cameras which we make available to hams at greatly reduced prices. These cameras were rented out for temporary surveillance jobs on construction sites, county fairs, conventions. etc. All have been checked out and are guaranteed for 90 days. Complete with vidicon and ens.

Wcars

More than 500 radio amateurs from all over the Western United States and Northern Mexico belong to a network called the West Coast Amateur Radio Service dedicated to maintaining one clear channel on the amateur bands 7253 kHz. Participants monitor this frequency so long as conditions permit during the daylight hours for the purpose of providing service to the public and other amateurs. Any amateur station requiring any kind of assistance can get help merely by calling in. The Service is a kind...

Wtqk

Ken Sessions, Jrm K6MVH 4861 Ramona Place Your ideas on paper can put your 0ntariOt CA 91762 Amateur radio has a widespread reputation for being an expensive hobby however, an increasing number of amateurs wall attest to the fact that ham radio can pay for itself. Interest in amateur radio, for instance, can lead to technical competence a prerequisite for a career in electronics* There are, of course, a great many of us whose careers are already solidly established who are satisfied with our...

Space Electronics

II S mmlt Ave., Paterson, N.J. 07407, (201) 791-5050 Basically I am not a home brew man in fact I deplore it due to a visual problem. Nevertheless, I enjoyed the June Surplus issue. I picked up many tips that I would like to try in my shack, I would like to see more issues of this type. Very good issue, Opportunity knocks 1 I understand that a Tornado-be ItM senator, taking advantage of a rare tornado warning in the Capitol City, rammed through a measure to initiate a study on how a tornado...

Hytower

Galaxy R-530 695.00 Hy-Tower Modef 18HT., 5149.50 Shipped pre-paid anywhere in l48 Check or Money Order attached American Express - Bankamericard - Diners Club exciter and linear. I suggest you leave in the 810 modulators as a bleeder. They will help regulate the plate voltage and improve the signal. When my 810s give out I doubt if i will rep ace them as they make a costly bleeder. The change in the screen supply has been covered, 1 added one outboard socket on the VR tube chassis so that I...

Wtru

Care and Feeding of a Ham Club Advanced Class Study Guide Part V Receiver operation A 2.00 Phone Patch Trapping Strong Signa Is Review The Hustler 4BTV Vertical An Antenna for small space Hi-Quality Hybrid Postscript* More on this fine receiver oriqinally shown in February 1968 issue How to Pass the Extra By Learning , WB6BIH Overcoming the psychological block A Military Career for the Ham _________________________________ G5ACY The Armed forces is lookinq for you Rode With the J1 S a m m - r m...

Kjw

He regenerative receiver offered highest sensitivity per circuit element, though, and experiments aimed at increasing its sensitivity resulted in the super regenerative circuit This circuit actually oscillates, but its oscillation is interrupted or quenched at a supersonic frequency. As a result, you are able to hear the actual electron noise in the antenna wire. Any more sensitivity than this would be unusable anyway. Unfortunately, both selectivity and stability on a superregen are poor. In...

Bob S Amateur Electronics

CITY, OKLA. 73104 TRADE EVEN Have new boxed Swan 500C with 137XC for any of the following surplus sets SG-1A ARN with PF-348 3G-2 GRM-4 SG-13 ARN MD-83A ARN ARM 47 UPM-98 or 99 R-390A URR ARC 102 618T Phone collect for trade (813) 722-1843, Bill Slep, W4FHV. Slep Electronics Company t 4214 Highway 301, Ellenton, Florida 33532. SAROC FOURTH ANNUAL fun convention scheduled January 8-12, 1969, in Hotel Sahara's new space convention center, Las Vegas, Nevada, Advance...

Rf W

The grounded grid rf amplifier described here covers a continuous frequency range of 3,0 MHz through 38 MHz in five steps. The circuit is straight forward, built around a pair of 4E27 tubes in parallel, with a pi-network output, If you prefer, 813 tubes may be substituted for the 4E27s without any electrical change in the circuitry. Mechanically you will have to change the plate caps for the 813's, the rest of the hardware remains the same. The amplifier is built on a 12 x 12x3 inch aluminum...

Write For Telrex Pl

BALUN FED INVERTED-V EASY T0-1NSTAI L, HI-PERFORMANCE LOW-FREQUENCY ANTENNAS Mono Bands from 23.95-Afso Trapped 2 and 3 Band Kits. 3, 4 or 5 Band ConicaWnverted-V Antennas from 52.95 3, 4 or 5 Band, 5 to 10 TELREX COMMUNICATION ENGINEERING LABORATORIES ASBURY PARK, N. J. 07712 Peter A Lovelock WbAJZ 235 Montana Avenue Santa Monica, California 90403 I had been listening to glowing reports on the Hustler 4-BTV trap vertical antenna for almost a year before I decided to try one. A...

Operating Desk

This beautiful operating desk is just perfect for the modern transceiver ham station. The desk is 28 high, and about 40 by 18 top area. It is made of Pervaneer, which is scratch resistant and almost impervious to stains, age and heat. There is a large side shelf cabinet with a swing door for power supplies and other accessories. Walnut finish. Shipped FOB Wright City, Mo. Weight 39 lbs. Also makes a fine small office desk or students desk. What a birthday or back to school present for the...

Try Us For Highest Tradeins

Elco 753 used 99.00 Eico 753 f w new 195,00 Eico 751 f w new SO.OO SB300 revr amp SB400 emitter, Heath, special 495.00 2iCL200G new 495.00 Ranger 11 t w, new, 250.00 FRECK RADIO amp SUPPLY CO., INC, 38 Biltmore Avenue Asheville, N.C, 2A8 H Tt T, Freck W WL 704-254-9551 Doug Jones WB4IH0 LARGEST SELECTION In United States AT LOWEST PRICES 48 hr. delivery Thousands of frequencies In itoclc. Types Include HC4 U, HCE8 U, FT-241, FT-243t FT-I7 , etc. SEND 10 for catalog with oiclllator circuits....

Jefftronics

ARC-1 Transceiver 100-156 Mc. 28 tubes, 20.00 Command Xmtr. 4-5.3Mc. Less tubes, fair Loading Capacitor, 5-sections, 4Q0pf per sections, with ' saft adapter. 2,30 Please add shipping charges Hundreds of other surplus parts and equipment. 4252 Pearl Road Dept. J8 CLEVELAND, OHIO 4410 Lately I've read a few comments on the intruders in the JO meter hand, It is my opinion they present us with ft golden opportunity to demonstrate our skill as radio operators. Having seen the Heath SB-101 with its...

M

12 BLANKET FREE WITH 2 NEW 56 SUBSCRIPTIONS This 50 x 60 sport blanket comes from Spain and is made of virgin wool, cotton and rayon. Machine washable. Beautiful yellow red and black design. Comes in zipper vinyl case with handle. Fine for the car, picnics, etc. 24 HOUR OPERATING DESK CLOCK FREE WITH 5 NEW amp SUBSCRIPTIONS 3 K amp E SLIDE RULE FREE WITH 1 NEW 6 SUBSCRIPTION A slide rule is indespensible around the ham shack or the office. This one has everything you need, but is inexpensive...

Zip

Carole Allen W5NQQ 308 Karen Drive Lafayette, La, 70501 id you ever attend a meeting for the si time without even one person saying, ice to see you here ' or Be sure and ome back next time Most of us have and an well remember t linking, Well, I ouirln t have shown up in the first place, I - -re's no percentage in being thin-skinned, ai newcomers in a club should be given ome kind of recognition. I Aknmari, W8QWI, former president of tile Lorain County, Ohio, Amateur Radio Asia ion feels so...