Aan

Richard Schivanke W9HXM 235 Cumnor Avenue Glen Ellyn, Illinois Nowadays, if on operates CW without a squeeze keyer, he is not a member of the in group. The squeeze keyer presented here is. to the best of the author's knowledge, the first unit which will perform either of the two popular forms of squeeze keying.1-2 When desired, it can be used as a conventional keyer. With a single lever, it has very agreeable timing and is rather The circuit diagrams are presented. Fig. X is drawn with NPN...

Monitor Receivers

3Q-40mc or 40-50mc (LOIFNB 1101 A) or 150mc(L03) 65.00 V* KW power transformer and blower assembly ( K599) 49.95 Collins R425B 420mc receiver, new 49.95 Transistorized 150 mc pocket transmitters, 2 freq. L mike& baneries, 213NBC 39,95 TEK13A battery tester for H & P series Handie-Talkie General Electric Pre-Prog mobiles 6 12vP 420 mc (L access). Each 49.95 Motorola Handie-Talkies, 150 mc-1 watt output. With Ni-Cad battery & ant. H23BAM1101 AH. Each Digital Decoder, Secode RPD 634 D ec...

Unistrut

Cable was iri place over the pulley at the top. Lacking complete confidence in my own work, I did step the pole for climbing but have not had to go up yet, The steps are at 90 instead of 180 , as is customary, to permit the beam to clear coming down. In my c ise the control cable and feed line are supported at about 20 feet above ground on the trunk of a tree about 25 feet away from the pole, and a slightly slack loop maintained to the cradle when at the top. This permits the cradle to be...

Oroer Blank

S enclosed for copies of Advanced Class Book Me W2NSD 1 continued front page 4) amateur radio has been stifled, the country has suffered tremendously from a lack of engineers and technicians and has found it difficult to de velop iheir communications and electronics industries. In numbers we have strength and we neid that strength badly. The time is drawing near when we will have to either fight for our frequencies or else watch them dwindle jway as they have in the past- The time is here right...

Base Station Mikes

Minimum C.O.D. order, 50.00. 25 deposit required on aii C.O.D. orders. Mich. residents add 4 safes tax. Prices subject to change without notice. Many more items too numerous to mention. Write for equipment not listed. Motorola transistorized low band pocket transmitters, H 11NBC, Microfabs AB21, 21DB-50 Ohm pads, each 3,95 I222A signal generator . 39.95 D43GGV 1 50mc 6 12v mobiles < 30W) 110.00 T43GG V 1 50mc 6 12v mobiles 30W> dual freq, P.L. rcvr....

Leger Laboratories

Groton Street, East Pepperell, Mass. 01437 Many pieces of amateur radio equipment transmitters, receivers, test equipment and the like use oscillators in one form or another. These circuits generate ac voltages at fixed points across the entire communications spectrin a, The signals genera ted by these devices are the heart of all communications systems. In the beginning, amateurs used the spark gap as a rather crude method of generating rf energy. Frequencies were unimportant then and methods...

Info

James Research, 9 JAN Crystals, 142 Jefftronics, 121 Mendelsohn, 122 Meshna, 102. 103 Miller, J+ W., 88 Mosley, 41 Murch, 52 National Radio, 35 Newsome Electronics, 106, 107 Pennsylvania Electronics, 92 Pt J s Radio Shop, 90 Poly Paks, 143 Productos Joga, 87 65. 80, 95 Redline, 86, 89, 91 Rousseau, 17 R Se R Electronics, 124 Salch, 21 Sams Books, 93 Selectronics, 112 Signal One, 5 Slep, 76, 120 Space Electronics, 104, 105, 142 Stellar Industries, 53 Swan, 13 Tower Communications, 123 Trio-Rio,...

Any Reasonable Offer Accepted Vacuum Equip

Welch Duo-Seal I402B Lg Cap Hi Vacuum f40 Ltrs M & Mtro Mint & LN Consolidated Vac, Corp PMC(15A Diffsion ION Pump, & Like New HiVac Valve CVC VOS2l, Like New Temescal VAC Value, New. W.E, 293 Spring Relay Tool ____2 i CD307A 6 ft Ccrd PL55 & JK26 2 l Carborundum Fine Stone 2 I 5-way Red & Black Binding Posts, 5 l Line Filter 200A 23 VAC, 55 , 5 S20 Weston 0-130VAC 3 Rd 4 Elapsed Time Meters 115VAC 3 ____ 6 Var acs 0-I20VAC I0A & K& D, LN 16 Variacs 0-135VAC 7.5A & K&...

Condition And Checked

Mode 62-117, 0-500V 300 made, 0-300V 150 made, 4-8Vac 10A, Fully metered and 6.3Vac 3A 40.00 and 6.3Vac 5A 89.00 10E, LAMBDA Model 2S, not metered 25.00 11E. RT-400 ARC-65 Airborne H F receiver- 100.00 ATTENUATOR BRAND NEW) MANY USES, RECEIVER ATTENUATOR, USE WITH CHEAPER R-F SIGNAL GENERATORS TO MAKE SIGNAL TO NOISE MEASUREMENTS, ETC. ATTENUATES TO 500 MC. A TOTAL OF 51DB ATTENUATION IN 1DB STEPS WITH 41 COMBINATIONS. 50 MINIMUM ORDER 5.00 For prompt shipment please...

Slep Euectronics Company

FLORIDA 33532 WRITE'WIRE-PHONE (813) 722-1843 BILL SLEP, W4FHY TUBES 75c each, 10 for .00, 50 for 25. All tested. 2021 AAH6 AAK5 AAL5 AAU5 OA2 I2AT7 I2AX7 J2AV7 SHS 6085 2E25 tubes, new 1.50 each, 10 for 10.00 Dumont pho+omuitlptier tubes, type K-1430 57,50 each, I0 S70, TS-33 AP radar wavemeter, has 50 microamp meter, 10.00 TS-34 scope, _____ _________ ip i i - - - 1 i r -rill p nn-tt n -p -p 1 -i r i i - n + ri b et 35,00 BC-221 frequency meter, excellent, with...

Core

Detailed illustration of the tri filar transformers, showing hookup of the three windings. The dots indicate that a current entering the primary in the direction shown will induce positive voltages at the ends oj the secondary windings marked by the dots* be evident that the circuit can be stuffed into a very small space and hidden on a printed circuit board or in a corner of a chassis since no access to it is needed. An unqlad epoxy board should be used to minimize unbalanced coupling...

Howard W Sams

Advanced & Extra-Class Amateur License Handbook by Howard S. Pyle, W70E. Provides ail the information you need to obtain your advanced or extra-class license, Makes preparation for these top licenses far easier for present holders of lower licenses. Includes sample questions for each exam. 192 pages. 20649, General-Class Amateur License Handbook by Howard S. Pyle, W70E, A complete guide, including typical FCC test questions and answers, to help you prepare for the Technician, Conditional, or...

Peterborough Nh

Fred Moore, W3WZUt broadcast engineer, 4357 Buckfleld Terrace, Trevose, Pa. 19047. Novice transmitters and receivers, HF and VHF antennas, VHF converters, receivers, AM, SSB, semiconductors, mobile test equipment, general, product data, pulse techniques, radio astronomy, bio-medica eiectronics. Walter Simciak, W4HXP, BSEE, 1307 Baltimore Drive, Orlando, Florida 32810. AM, SSB, Novice transmitters and receivers, VHF converters, receivers, semiconductors, mobile, test-equipment, general. James...

Letters

On July 2F 1968 1 was working on the 4-12 shift. I left Bartow, Florida to return home in Lakeland at about 12 15. Phis trip takes about 15 minutes at normal speed, so I judge that it was near 12 35 am when I got home, 1 parked at the house and stepped out into the drive to take a look at the weather. It was very quiet and I could hear a strange noise as if there was a sharp breeze coming in- I looked up in time to see the cause of this swishing sound. 1 saw a disc about 20-25 feet across...

Test Equipment

OS-8 Pocket size scope 3 portable )2x8M weighs about 15 lbs. 0-500 KC Verticle amp 0-2 MC USM-32 Dumont, compact m od ern scope V x x 1 from I OCRS to 4MC with trigger generator, time marker, amplitude calibrator only 149.50 ALA-2 Pan Adapter (See June 1954 issue System Control Amplifier, feed in to 5 volts DC out 4-20 MA. upon removal of input voltage, output will hold until a new voltage is supplied into the input. New ea. TS-323 Freq. Meter, Frequency range 20-480MC plus or minus .002 o o...

Iuf

Sim pie compressor control circuit and shghtly more elaborate circuit B providing threshold'7 action. resistance settings of the potentiometer and increasingly us a compression amplifier as the potentiometer resistance is decreased. In the unit used by the author, output coupling for the IN270 rectifiers could simply he taken from the single-ended 2SB176 stage nsing the components already available as a frequency compensating network across the output transformer. Using units with...

Motorized Coupler

ANTENNA COUPLER TTNIT IT 331001-110, For remote operation. Jennings variable vacuum capacitor iS-TTiO MM1 5 100 v motor driven 28 VDC with 2 Autosyn uni's attached. 1 , V 40U cy, Also fljeed vacuum M MMF 1ST00 J V. Two sec-Hon rotary inductance roil appro . 100 Watt motor driven 2s VDC. One heavy duty switching assy., motor driven 115 V 400 eye. Blower also other Motor-. Selayn.s, Diodes, Cap Res,, etc. In sealed housing i gt ize 23 i fl x Z. C30 HA Wt. 35 lbs, FSN 5821-606-0203

Power Supplies

LAMBDA MODEL 29M RANGE 100-200 VQC 0-100 MA B j Ii REGULATION, 5MV RIPPLE 6,3 VAC F L OUTLET, RACK MOUNTING INCLUDES METERS FOR MONITORING BOTH THE VOLTAGE AND THE CURRENT GUARANTEED, PRICE EACH Uc.00 LAMBDA MODEL C86OM -- 0-200 VDC, O- OO MA REGULATION- 3 MV RIPPLE, ALSO A 6,3 VOLT OUTLET AT 20 AMPS RACK MOUNT, INCLUDES METERS FOR BOTH SCALES SPECIAL ---------------- EACH 55.OQ DC VACUUM TUBE VOLTMETER TR 10 LASS MODEL-SF1306 0-3,5, 0-35V, MODEL-SF 675 0-3j 0-60, 0-300V, MODEL SFI23 lt 0-I50V,...

Motorola Fm Equipment Schematic Digest

91 pages VAU x I7M of schematics crystal information, alignment instructions, service hints and specialized information. 3,95 post paid. 1100 Tremottfr Street Boston, Massachusetts 02120 R1 3S lt ornmind receive I OR-132 mc AM, 4 lube, 2 uv sensitivity No dial, tt'e give knob, inning KTanh, technical Jdtj Needs power supply amp conirois as athei Commands. NF-W 27.50 R22, Command receiver 4 M600 kc, with knob and tuning graph amp technic J data OK _____17,95 R11 a Modern Q p er 190-550 KC lt K5...

Untested Tested Ok

Key boa rd 13 5.00 Power Supply 200.00 M-I4TD Tape Reader , 50.00 No Keyboard 50,00 with Keyboard 75.00 All above units have sine, motor and will be complete and in good Physical condition as removed from service MX-949 U tube tester adapter with this late model adapter you can test 9 pin tubes on your M77 Tube Tester. Excellent cond. 9.95

Buyselltrade

Airborne Equipment ARC-34, ARC-38, ARC-44, ARC-45, ARC-51, ARC-52, ARC-54, ARC-55, ARC-59, ARC-60, ARC-73, ARC-95, ARC-102, ARC-HI, ARC-II5, ARC-I3I, ARC-134. ARN-14, ARN-18, ARN-21, ARN-30D, ARN-31, ARN-32, ARN-52, ARN-59, ARN-67, ARN-68, ARN-82, ARN-83, ART-34, APN-9, APN-22, APN-70, APN-II7, APN-122, APN-129, APN-133, APN-134, APN-I4I, APN-158, RT-279A APX-25, APX-44, APX-68, APX-72, ARA-25, ARA-31, ARA-41, ARA-48, ARA-50, ARA-54, ARA-56. COUPLERS. CU-527 AR, CU-942, CU-991 AR, CU-1658....

Or

Palmer K9DRB Milwaukee School of Engineering Milwaukee, Wise. 53201 A problem encountered by technical people for many years involves the two fleeting quantities known as impedance and reactance, One never really knows when reading an article or text which one is being discussed due to the ambiguity traditionally associated with these terms. Many publications presently in print speak freely of reactance as having a phase angle' or impedance as being a simple number...

With Builtin Ac And Dc

The new Swan Cygnet is a complete SSB transceiver, with self contained AC and DC power supply, microphone and loudspeaker in one portable package. The Cygnet features full frequency coverage of the 10, 15, 20, 40 and 80 meter bands with a power input rating of 260 watts P.E.P. in single sideband mode, and 180 watts CW input. A crystal lattice filter at 5500 Kc is used in both transmit and receive mode, and provides excellent selectivity with a 2.7 Kc bandwidth at 6 db down. Superior receiver...

Knows No

Last fall, when Wayne Green and his wife, Lin, were vacationing in Europe, they met Fernand Dubret, HB9PJ, of Geneva, Switzerland. Mr. Dubret tokl them of his role as an amateur radio operator in saving the life of a Polish child who was dying of Wilms tumor, a malignant tumor of the kidney. Recently, Mr, Dubret sent his personal account of his arranging to send equested medication across the iron curtain. With his account were several photographs, and copies of congratulatory letters from the...

Antenna Strain Insulators

8V4 x VA x 1 .75 DUMMY LOAD RESISTORS N.LT. GLOBAR, 51 Ohm or 10 Ohm, approx 8W S .50 RCA Type WA-21 115.00 2E. HEWLETT PACKARD Aud. Freq. Meter, Ranges 50, 100, 200 amp 500 Hz, 1, 2, 5, 10, 20 amp 50 kHz 55.00 3E. BERKELEY Model 5580 Ref. GenS 100.00 W Optional Plug-ins 5581 4, 18, or 21 25.00 5 to 40 Mc 125.00 Model 6E, BENDIX Type 13656-2A Active 400 Hz Band Pass Filter 12.00

Convention Arrl National

SELL DX100 50r Seneca S150, AF68A S80, PMR8 S80t M1070 20, All with cables and instruction books, FOB 5 Fairland Street, Lexington, Mass. 02173, W1FEX, HALLICRAFTERS SftlSO with AC and DC power supplies, Mobile mounting rack, 325 Dave Hein-baugh K0ZMA, Belle Fourche, So. Dak. 57717. Ph. 602-892-2256. THE TENTH ANNUAL NEW YORK STATE SOUTHERN TIER HAMFEST sponsored by the IBM Amateur Radio Club, QCWA. AREC and affiliated clubs will be held on April 19, 1969 at St. John's Memorial Center in...

Miniature Signal Tracer

Signal Tracer

This is by far the single most valuable piece of test equipment for servicing receivers and audio equipment. Built in meter for measuring gain of each stage under test. Easy to find weak or defective stages. Output speaker built in or to VTVM or scope. No line cord since it is self powered. Worth its weight in batteries, invaluabfe for testing transistorized or IC gear. Saves its price in batteries for long range operation of radios, cassette tape recorders, etc. 0-20 VDC 150-200 mA. Metered...

Semiconductors

SI I ntegrated Circuit, Rca CA3012 IF amplifier-iimiter, Gain 61 dB at 10,7 MHz. 10 fead TO-5 package. With schematic .75 ea, 5 for 3.00 52 Amperex 2N2671 100 MHz FT. RF amplifier-mixer, 4 lead TO-5 case .40 ea, 6 for 2,00 53 Amperex 2N2089 RF amp, mixer oscillator. .35 ea, 12 for 3.00 54 Delco DTS-413 Silicon NPN planar TO-3 case. 400 Vceo 100 mA continuous. Hfe 20 5 v 500 mA. FT 12 MHz. Used as TV vert, output. ea, 6 for 5.00 55-Defco DTS-423 Silicon NPN planar TO-3 Case. 700 Vceo 100 mA...

The Stellar Case Station Is Now A Reality

THE ANSWER TO THE TRAVELING HAMS NEEDS , V _ .Jfy _ ftg W -V An internationally-known DX er, Mr. Cus Browning, W4RPD, is planning to leave on a new DX-pedition during the month of February, 1969. He is taking with him two specially designed Stellar-Case stations. These stations will be contained in two custom cases, containing a Galaxy V transceiver for 80-10 meters, power supplies, remote V.F.O s, a specially-built Galaxy 160 spare parts kits, microphone, keys, log books, tools, meter, and so...

Converter

Vanguard Converter Hollis Dual Gate

144-146 MHz In. 28-30 MHz out or 146-148 MHz 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 hundreds 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 the 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 wait Then send us a postal money order...

Compressor Preamplifier

By the addition of a few extra components to an inexpensive, already assembled transistor audio amplifier, one can produce a very satisfactory but yet inexpensive audio compressor for use between almost any microphone and AM or SSB transmitter. he author has constructed many differ- ent types of audio compressors and has became convinced that under poor signal conditions and with transmitters lacking effective ale, that they are a definite advantage. The problem in constructing a compressor is...

Your

Over 60 of listings changed in only a year Roger Taylor K9ALD, BSEE, 2811 West Williams, Champaign, Illinois 61820. Antennas, transistors, general, Michael Burns Jr. K9KOI, 700 East Virginia Avenue, Peoria, Illinois 61603. AM, SSB, receivers, transmitters, digital techniques, novice help, general. Jim Jindrick WA9QYC, 801 Florence Avenue, Racine, Wisconsin 53402. Novice transmitters and receivers, general. Owatonna, Minnesota 55060. AM, SSB, novice transmitters and receivers, HF receivers, VHF...

Dura Tower Sales

Box 322, Angola, Indiana 46703 Phone 219 665-2901 Eves Only Since we, as amateurs, are supposed to be able to make reasonable repairs on our equipment by ourselves, it behooved us to have enough test equipment on hand to find out what has gone wrong when disaster strikes. This can lead to a whole workbench full of expensive ge tr if it gets out of hand, A recent ad in 73 for The Mini la gt seemed worthy of investigation. When our unit arrived for test we found that it was the usual VOM size,...

Magazine

Gahanna, Ohio 43020 I hear many hams talk of the troubles they have in accurately aligning the ifs of their receivers, especially some of the newcomers using a converted surplus receiver. I have been using the procedure listed in Fig, 1 for years, and find that most receivers will come close to reading correct if the ifs are set correctly before any rf or oscillator alignment. As all American BC stations use 10 kHz separation and are crystal controlled, I use...