Inc

Tliat keeps you from seeing down into the coil Watch yourself on this move for you can break off one of the wires of the coil which come through the two holes in the circular piece. The upper terminal (on the rf coil side) is the bottom end of the winding. Lay that over the coil shield out of the way, Now reach down with a midget screwdriver and pull off the tape from the top of the coil. With that off you can unw ind the coil turns freely. Pull off 35 turns. If you lose count don't worry about...

All Kinds

EVERYTHING UNCONDITIONALLY GUARANTEED (C) means with Cert, of Calib. traceable to N.B.5. If Item isn't already cert.t we can get it done at request, TIME PAY PLAN Buy anything over 149.00 with 10 down. , 49.95 179.50 .195.00 . 295,00 .350.00 .195.00 . 295.00 Collins Radio ZIFQfr' Test Set bra u new & 7SA1.-S475. A.R.C. H-14, UPM*6B, Tacun Testers, ILS & Omni, Too manj to list here semi lor list or tor need* Jackson 655 OficLllaUir 2l> - i0U,QU0 cy Hew -Pack 202B Ose. -50,000 cy, flat 1...

SWAN

SWAN 350 80-fOm Transceiver (14.98) SWAN 400 80 -1 Om No VFO (14.98) SWAN 500 80 -1 Om Deluxe (17,69) SWAN 250 6m Transceiver (f 1,55) Mark 1 10-80m Linear - less tubes . . . (16,79) Mark 6 6m Linear - less tubes (16,97) Two 3-400Z Tubes for Mark or 6. II7XC AC Supply for 350 250 II7XB AC Supply for 400 14-117 I2v DC Supply w cabie + 405X MARS Oscillator - less crystals 406B Small Phone Band VFO 410 Full-Coverage VFO 210 6 Meter VFO VX-I Plug-in VOX for 350 & 400 - , . . SSB-2 Selectable...

Sydmur Electronics Specialties

Brooklyn, N.Y. 11230 That's right. Get your FCC commercial op orator's licensei and then work, at good pay., in your hobby field--radio end electronics., We prepare you by correspondence, under our 'qet your license or your money back warranty, Ge+ f ll I defalk in our free FCC License Course Brochure. Write Grantham School of Electronics, Dept. R> 1505 N. Western Ave,, Hollywood, Calif. 90027 feltaws back home we i informed so they can be on the air when you arrive at a rare...

New Products

The new Heathkit SB-301 Amateur Band Communications Receiver is an improved version of am already iamous pacesetter, the SB-300, Some of the new features of the SB-301 are increased sensitivity, full RTTY provisions, 15 to 15.5 MHz coverage for WWV, built-in automatic noise limiter, and fronl panel switching oi the optional six and two meter converters- The SB-301 covers 80 through 10 meters with provisions for AM, CW, upper and lower sideband and RTTY, It lias a crystal-controlled front-end...

The Heathkit SB Receiver

The Heathkit SB301 is an updated and improved version of the older S13300 which, in its short history has already earned a well-deserved niche in ham radio. The 301 is a ham-bands-only 3SB AM CW RTTY receiver with coverage from 3.5 MHz through 30 MHz, easily extendable to the 2- and 6-meter bands with accessory converters, both of which mount neatly on the receiver's rear apron, A front panel switch concentric with he rf gain control selects either converter and simultaneously switches the...

The Whole of The Doughnut

How to use toroidal tank coils in high power amplifiers for increased efficiency with reduced size. Practical inductors are shown for 100, 500 and 1000 watts. Toroid rf tank coils have brought a new era of construction technique to the amateur builder as well as commercial manufacturers. Spurred on by modern requirements for compact construction, the toroid has seen recent applications in DC to DC power converters, interstage audio transformers, and many other uses. Indeed, the largest single...

Receivers

R-I05 ARR-I5 Collins 1.5-18 Mc exeint RBS 2-20 Mc. No pwr sup Good cond. RAK 15-600 Kc. No P S Good cond RDZ 225-400 Mc . Good cond. RBA 15-600 Kc II0VAC Excellent RBB 600-4000 Kc same Excellent R-444 APR-4Y AM & FM Like new RDO Less plug-in tuners Excellent 38-IOOOMc, 4 bands jilrrf. BC-683 27-40 Mc AM & FM Excellent

Select Capacitor To Tune At Each Xtal Frequency

Conversion of the SW 120 receiver to six meters. L consists of fO turns number 26 closewound on a 1 411 slug-tuned form, L2 and L3 are both 12 turns number 26 closewound on a 1 2 form L4 and L5 are 30 turns number 30 closewound on ' V form L6 and L7 are 11 turns number 26 closewound on a slug-tuned form. except for the minor changes shown in the carrier balance control and transmit-receive switch. Also, the VFO was adjusted to cover 14,0 to 14.150 MHz to the 12BY7 mixer. This was only...

Save

Purchase any new Swan transceiver or linear at the regular price with no trade-in and you may take a 50.00 Credit toward the purchase of any other merchandise. L Ray Grenier, K9KHW Mgr. Mail Order Sales Ray Grenier, K9KHW Mgr. Mail Order Sales To AMATEUR ELECTRONIC SUPPLY 4828 West Fond du Lac Avenue Milwaukee, Wisconsin 53216 7 I am interested jn the following new equipment I have the following to trade what's your deaf Ship nie Ihe following New Equipment. COD I year 2 years 3 years

Electronics

CharUi Land ah I W5S0T 121 Barranca Read Los Alamos, New Mexico Including the use of a FET in the BC-906 frequency meter. It is hard to resist a winning combination, particularly when that combination happens to be articles and ads in 73 magazine. The spell-binders referred to are, Field Effect Transistor Primer by Jim Fisk1 and I wo Transistor Testers by Frank ones.2 Couple these with advertisements such as Poly-Paks and Meshna in which you find almost unbelievable semi-conductor and...

Info

Please rush me a quote on the following gear that I have to sell NAVY TED TRANSMITTERS AN URR-13,27.35 etc. AN URA-6,8,17 AN SPA-4,8,9. 19,26.46 RT-66,67.68.69, 70,77 AM-6S GR. T-368 UR, PP-II2 GR. RT-174 PRC-B, R-108,9 GR, RT-175 PRC-9, R-l I0 GR. RT-I76 PRC-10, T-I95 GR, AN PRC-25, R-I25 GR, T-2I7A, T-235 GR. R-278B, SB-22 PT, MD-I29A GRC-27, AN VRC-12, etc. T-302A, AN-912,3 R-4I7A, AM-914,5, PP- Collins I7L-4.7, 51X2. 5IV3, 6I8S, 6I8T, I8S-4, 621 A3, 860E-2, 618M, 51 R3, 578D, 578X. 479S-3,...

Meshna Surplus Bargains

REFLEX CAMERA American made, takes 16 pics 127 film 1.50 GEfGER COUNTER complete w meter, 550 volt transistor supply, less probe tube. 410,, 4.00 ANALOG TIMER w sync motor, nC metgr, 8 hr. input to 10K output via gear tram. Made by Veeder RooL I VR -f 1 gt 50 POLICE-FIRE converters. Kit when wired makes your car radio into short wave receiver High hand 100-200 mc or low band 25-100 mc. Either kit 5 00 or both kits 9.00 FET transistors w spec sheets. N channel unction FET ea 6 5,00 240 AMP...

Momotale Multivibrator

Fig, 4, A monosfebfa multivibrator using the L9I4. least expensive, most available ICs on the market. In small quantities 1-99 the price of a simple j-K flip-flop has dropped to 1.35 and that of a dual two-input gate to .80, A number of semi-conductor manufacturers, Motorola, Fairchild. Speny, Texas Instruments, and others all make the RTL line and at least between some units, voltages are compatible. There are two mainly-used packages, the TO-5 can with 8 or 10 pins and the Dual-Inline Package...

Power Rating

We are pleased to offer the new band switching deluxe Swantenna as part of the Swan line. Two of the major improvements are the use of GE Lexan in the center coil support that makes it virtually unbreakable, and the new light weight stainless steel whip. The higher Q of the Swantenna and the gold plated switching contacts provide greater radiation efficiency and field strength than most coil changing designs. Thus with the new improved Swantenna you achieve the ultimate in mobile operation a...

Mcp Buffer

Basing diagrams, circuit logic dnd load factors for popular fC packages. The MC-numbered units are manufactured by Motorola pL-unih by FairctiMd, Fig, 5- A Fairchild 1914 in a bistable multivibrator circuit- sat ile R1 L gates that is in general use is the Fairchild ,914. M his is shown in Fig. 3, It can be used in addition to its normal use as a gate as a monostable, bistable, or astable multivibrator. The bistable multivibrator connection of this chip can be purchased as the AtT9025...

HAM Buerger

432 York Road Jenkintown, Pa, 19046 Phone 215-887-7350 How often when checking into a hotel or motel for the night, or if you live in a non-cooperative-land lord apartment, have you wished you could get on the air without causing an upheaval Well now you can The Vacationer Portable Antenna is the answer. The Vacationer Antenna is unique in the fact that this base loaded whip becomes a center-loaded antenna with very low SWR due to the simple wire counter-poise that is clipped onto the window...

Bca Walkytalky

BC-r gt WALKY-TALKY Range approximately 1 rn IJ . Used. fairly good condition. not tenlod, Pre-set for 1 frequency with 3.5-6 itiHz, no selection of frequency, with tubes, antenna, Jjui less bam-rioa, Ship- ff 1 A OC pinsr wt, 15 lbs, EACH D I H.TD excellent spare ch 6i Tor above, prirtd o low lhat in the event of trouble ft would be heap r o insert a nt-n charts Aiso exeellcni for the amateur or technician who prefers to make hi own style of wniky-talky, Supplied less tubes lt 1-1115. 1-1S5....

Amateur Radio Testing Circuits

Fig, L Circuit for testing the oscillating character- s cs of unmarked transistors. This circuit is shown with a negative supply for PNP transistors for NPN units reverse the meter and use a positive supply. Fig, L Circuit for testing the oscillating character- s cs of unmarked transistors. This circuit is shown with a negative supply for PNP transistors for NPN units reverse the meter and use a positive supply. the orbital beam hexode glass envelope anci try to guess which is the grid,...

JUNE

Lt. f T0 DIP JTT T mt .Ttt na.tu Wit, tri, Ltf titttlfUFb iif tmt it ill iRii 'idiim nlii. Hhtrill i i timiiiHitfi ml fl amp a tiumtTT tim y c tt uf i mm. ni-Ht m -ut Uwt t fr I lin E WrlfT 14m i' firitfPi i ' i lllHt 1 Hw in CS n v III lt r 11 F11 i rilUTilllU Sll Di lt gt ii'l-3fllii MM t r ft. F. frcfKfUa, PiFitnu UpffitUM ft F. ifc'111 E ItuWmi nttTHf italttr Hin it f r Ml I J iLH l I 12 Cull flit S tt Mi. t nn i ti Til Ii' h ikmi iti' ifT bu ti tHCft bat r vi UM I rfi4 rtTnit hJilti II jM...

Circuitry

The incoming signal is amplified by a 6BZ6, the rf stage and capacitance coupled to the grid of the first mixer, a 6AU6, which receives the local oscillator signal from the crystal-controlled 6AB4 heterodyne oscillator, The latter s coils have a small pickup winding which feeds the oscillator output to a jack on the rear apron, where it is available for transceiving with the matching transmitter, the SB401. The 6AU6 mixer stage mixes the signals, with the sum and difference frequencies being...

Crystals

This 3 pin Holder can be supplied with either one or two crystals. When ordering specify if crystal is to be used for Transmitter or Receiver or Both, 0 TKC to 8000KC J SO OOIK t amp QQQKC 6.S0 MARKER FILTER SPECIAL USE CRYSTALS 3579.545 KC T V Colflr Hunt 1CH U WIRE LEADS

Teletype Demodulator Unit

Northern Radio type 104 model 3 11 tubes 115 or 230 V 60 cy operation GOOD CONDITION Price 49.95 Shipping wt, 50 lbs. The Stelma Telegraph Distortion Analyzer type TDA-2 js a seif contained portable unit designed to measure bias and distortion of telegraph start-stop signals. Distortion is indicated by vertical pips displayed in a rectangular pattern on the face of a cathode ray tube. Measurements can bo made while the machine is operating. Measurements can be made on circuits operating at 60,...

Southern Nevada Amateur Radio Club

Thanks participants and exhibitors who made SARCO' the FUN-CONVENTION, such a success in 1967, Stellar Industries, E G amp G, Southern California Edison Company. Brad Thompson Industries, Mission Ham Supplies, California Highway Patrol, Henry Radio. Tistao Towers, Weatherbie Electronics Center. Swan, Tri-Ex Towers, Collins, Hallicrafters. Superior Engraving, Hy-Gain, Radio Products, Linear Systems, Hotel Sahara. MARS. Raytheon, United States Air force, WCAKS-7255, W7SAI, SAROC 1968...

Free Arcturus Catalog

A Trusted Name in Electronics Since 1925 Electronic parts, tubes Wholesale. Thousands of items. Unbeatable prices, 502 - 22nd St.t Union City, N lt J 07087 accomplishment. The greatest _ hobby Es ait exhibition of your skill. Shaky speeds of a few words per minute E may be gained in most any haphazard, hit-or- miss system Professional skill will be gained only from professional training. Brochure 7-S it j free it gives you the facts. 3 739 Kazmlr Court, Modesto, CaL 95351 The Components...

Amitron

Red E Cores 500 kHz to 30 MHz T-200-2 3.00 Yellow SF Cores 10 MHz to 90 MHz T-94-6 .95 Black W Cores 30 MHz to 200 MHi T-50-10 .60 Spec Sheet 2.00 KILOWATT TOROID BALUN KIT 5.00 EXPERIMENTER'S 2 CORE TOROID KIT 1.50 Minimum Order 1.00 Please add 25c per order for packing and shipping. Fig. 13, Charts showing the capacitance required to resonate the three toroid tank coils on the five amateur bands. The L C ratios obtained on each band match the tube impedances most frequently used today, if a...

Erie

Latest type 190 to 550 KC, receiver, with 85 KC IF. Very excellent used, with all tubes. Internally com plote, le amp s dyn mot r Extremely excellent used, See Sept, 1963 issue, of 73, Q-Eer. Reborn, Dual 800 nr sec. 4500v variable capacitor. w i h s 12 plus M T for two Vk shafts. Has gt 0 I right angle drive, easily removed. I pounds, shipping weight NEW, 2 3 to 14.2 pf differential, m nn-ti re. 3 16 shaft. NEW, 4 Tor 3.00 5.5 to IS rf. miniature trimmer. H clia,T thick. Two Bolder Hamfelt...

Small But Powerful

SYDMUR SOLID STATE CD IGNITION SYSTEM Hiflh Quality Components used throughout. Fiberglass Printed Circuit Board. Unitized Construction Simplified Kit Assembly. Reduues jflnitinn interference. COIYIPAC KIT 24-95 Arid 75c for mailing arid handling N Y, State Residents add Sales Tax.

Ts I Ap

The rS 34 AP Oscilloscope is one of the best buys on the surplus market today but, tine to its World War II vintage, it is sometimes by-passed for other equipment. When you look at a TS 34 AP it reminds you of the old kaleidiscopes found in penny arcades at amusement parks the kind you squint into to see the girlie pictures. The TS 34 AP is something on that order but a face lifting will make it look like a million dollars. This oscilloscope is a real fine instrument and lias many excellent...

Navy Tcs Receiver Am

Tcs Receiver

Variable freq, oscillator amp crystal control on four 4 presoi channels in the entire niiige. Audio output l-o w tUs into SCO ohm load uses liiljts l SK7 IIP A,, 12SAT converter, 2 lfcSK7 IP A , 12SQ7 detector Bl O JUA6 oscillator, 12A6 audio Amp. 456 KC IF Large vernier amp spin dial, ami io gain J AVC, BFO aud all roiitrols ot, Mie front panel, Voltages required J2 Yin amp apjjrox, 220 VBC lnft MA, Size 11 X 11 AA 95 Wt. 37 lbs USED 1,5 MC to 12 MC in three...

Smj

Jim FEsk WIDTY RFD I Box 138 Rindge, N.H. 03461 Conversion of the APX-6 transponder to a grid-dip oscil lator that covers from 1050 to 1320 MHz. One of ihe big problems with operating on 1296 MHz is locating the operating frequency of your equipment- Not only is the newcomer faced with tins problem any longtime resident on 1296 will attest to the many checks he has made to ascertain operating frequency and band edges, Some UIIF amateurs have been able to obtain signal generators that cover the...

Newsome Electronics

2670 Pinetree, Trenton, Michigan 48183 Telephone 313-676-7460 satellites are 8 x 8.5 inches. For additional information on receiving pictures from the Automatic Picture Taking satellites, see QST, Nov. 65, p. 11. CQ, Sept. 66, p. 44. Electronics World, March 67, p. 23. CQ, Aug, 66, p. 25, Electronics, July 27, 1964 p. 81 amp 99. These machines will send and receive pictures, schematics, etc., up to 8.5 x 14. They can be used on the 2 meter band and up without any additional equipment other than...

Radio Shack

East 730 Commonwealth Ave., Boston, Mass. 02215 West 1515 So, University Or, Ft- Worth, Tex. 76107 Please rush me the irem I've checked below. J enclose _-__, plus 50 for postage and handling FREE 963 Catalog Matching Speaker. 2CM500, 7.95 FREE DX-150 Folder Q 12 VDC Power Set, 20-1501, 7.95 Receiver, 20-150, 119.95 Pius Shipping Cost

Vanguard Labs

Dept. 5 Hollis, N.Y. 11423 This column is set aside for short technical notes, comments on 73 articles, information about new and useful components and surplus, and announcements about technical nets and technical clubs, If you ve come across something that you think would interest 73 readers, but don t think it s worth a full article, send it along. Well give you credit in the column. Send your contributions to Paul Franson, 38 Heritage Road, Acton, Massachusetts 01720. Don...