With A New And Easy Learning Concept In Visual Memory Association

CIRCUITS, CIRCUITS, CIRCUITS Eiec ironic door buzzer. This circuit features a differen t tone for each door, The tones may be varied by experimenting with different resistors at each switch. Courtesy of Motorola Construction Projects HMA 37. Here is a circuit of a simple 2m converter that works in a pocket AM radio, Since it is crystal controlledt the receiver must tune to a frequency that equals the desired frequency minus 3x 45.5. Substitute a different frequency...

W

Castle Rock 443 60-448.50 Skunk Hollow 31-91 South Jersey 22-82 Lancaster 01-61 Bill Tumor WAQAB1 Five Chestnut Court St. Peters MO 63376 Bill Tumor WAQAB1 Five Chestnut Court St. Peters MO 63376 Early December brought several openings, WA1EXN worked WA5SJM on the 2nd and heard a similar open ing to Georgia, Kentucky and Tennessee on the 3rd, this one of 45 minute duration. Also on the 3rd Art worked Dan. WA9UBI, with 5-9 reports both ways. Dan was the only midwestern station heard, WA9YJE was...

Adapting Electronic Keyers To Older Transmitters

It ail began when a kind good ham friend donated an older type, cathode-keyed transmitter for use at my summer QTM, t was a Harvey-Wells T-90 immediately appealing for its compactness and Sight-weight as compared to my burdensome HT-32 when it comes to lugging it back and forth. I eagerly checked out the T-90, bringing it up to specs and found out, rather quickly, that I wouldn't be ibte to use my electronic keyer Heath HD-10) with it. The T-90, tike any of the older transmitters, calls for...

Info

This new radio, with built-in AC-DC power supply, is compactly designed with modular construction techniques for effective and reliable service in fixed, portable and mobile use for amateur, Civil Defense, CAP, MARS, RACES and other utility HF Communications Services. The new transceiver has premium type glass epoxy printed circuit board construction for greater reliability, routine maintenance and features the latest state-of-the-art solid state devices throughout. The All-American made radio,...

The Com Craft

Tor from the plus (+) or non-inverting input to ground equal to the parallel combination of resistor connected to the minus > or inverting input terminal. This is shown in Fig. 2-5. It is obvious thai if it is desired to have the ac signal appearing at the output referenced to A plus or minus dc signal that the potentiometer shown in Fig. 2-6 can be easily adjusted to do this, I lie usefulness of this adjustment shows up in slow scan when accurate adjustment of the black level is necessary....

Summer E Season Report

The last half of June along with July and August seem to have been very active with not only aurora and Efs, but with continued F2 contacts as well. There seems to have been a tot of activity in the Caribbean area. A number of stations, from all sections of the United States, worked VP5RS, 8P6EN, and a host of KP4's. August seems like an interesting month for Jack K2KDQt He told of hearing a pair of KH6's in QSO. When Jack tried to break in, one of the stations came back to him and said K2...

Waabi

If you want test gear for the shack with famous Heath quality and performance at low mail order prices, but don't have time to build a kit, try us. We're Heath Schlumberger Scientific Instruments, a division of the Heath Company the kit people. If you hold a ticket, you've probably heard of the Hams at Heath. But you've probably never heard of us. We deal primarily with industry, r amp d labs and colleges and universities. And we don't make kits we don't even make ham gear. What we do make is...

Fet Probe For Oscilloscope

A new active FE1 robe for wideband oscilloscope nas been announced by Test amp Measuring Instruments, Inc. The PM9353 measures low amplitude, high frequency signals without appreciable circuit loading. The probe's bandwidth is 220 MHz, making it suitable for oscilloscopes with intrinsic bandwidths tr MHz with no adverse effect on V scilloscope rise time. Input impedance of the PM9353 is 3.5 pF in parallel with 1 Mft its unity-gain FET amplifier eliminates the 10 1 attenuation on conventional...

Wazdf

WILSON M340 amp M810 plus SIGNAL ONE'S CX7A Wilson Electronics has gotten together with Signal One to make it easy to own the best DX combination available. If you purchase a Signal One CX7A from Wilson Electronics for 2395.00 we will give you a 6-element 20 meter beam for 1.00. Now the 6-element 20 sells for 300. If you don't want a 6-element 20 meter beam, we will apply the same value to any other combination of antennas you want. Trade-ins also accepted. For a winning deal call Jim Wilson at...

So Ohm Coax

TQA connections, The consiani - 332 -includes shortening factors and quad-coi ioading. timized by cut-and-try coil wind and substitution, lowest swr readings are the criterion of proper operation, along with proper Derivation of element formulas is quite simple - if you don't overlook the ninety degrees in the network Keep in mind also that since each complementary two-wire element functions as one full wavelength, you must double the usual shortening factor. There is also 2 or 3 per...

On

Tri-State Quad Butter . Tri-State Quad KufTer , 4-Bit Comparator Parity Generator Checker Programmable ROM . . . Binary to Octal Decoder Preset Binary Counter . Preset Divide by 12 . . Modulo Divide by 2-16 'Pri r State Pr ese t Counter Dual Voltaire Tranwlater Dual Diff. Lint Driver . Sale l.OO l.OO 1.00 1.50 l.OO 1-00 8.88 1.00 1.19 1.10 .41 1.50 1.95 l.OO 1-00 l.OO 1.45 1.45 1.95 NATIONAL 2.95 REGISTERS 3 for 6.00 Dual 25 Bit Dual SO Bit Dual 32 Bit Dual...

Sharp

Sharp Jter with 500 Hz bandwidth. Robert D gt Streeter WHIQl 2917 West brook, Apt. 412 Fort Wayne IN 46805 standard minibox. The i-f transformers were used because the steep skirts of a mechanical filter were judged an expensive luxury for this application Broad band mechanical filters are available in economy case configurations. A savings of at least 15 should be realized by constructing a case for F455FA05 filter. Installing this filter and a plug in a minibox should take a few...

Antenna

My work on the Long Circular Quad was a needed departure into endfire antenna design which proved ring shaped elements to be superior lo discrete directors in the possibly obsolete Vagi configuration. Extensive tests on a professional antenna range proved that. Another, although unproved departure from the norm, was George A H, Bonadio's Square Diagonal Antenna, commonly thought to be a diversity antenna, when in reality it is quite similar to an 8JK multi-driven element collinear,'broadside...

High

SimpJe RC ramp generation. Fig, 2-30. Operai ona amplifier with ftC integrat Very good sweep generators can be designed today from operational amplifiers. These small amplifiers have very high gain, low drift, and are very low priced. The famous 709 and compensated 741 are amplifiers made by many integrated circuit companies today. These op-amps come in three basic packages flat pack, DIP, and TO-99. The DIP or dual in-line package and TO-99 are the most attractive from a ham...

Limited Offer

The finest military digitat receiver available. ,5 to 32 Mhz unused. In the original package with manual, accessories and spare partsm Guaranteed. F O B. N.J. MILITARY ELECTRONICS CORP, 76 Brookside Drive Upper Saddle River, N.J. 07458 AM 1170 GRC 50 100 MHz Amplifier-Converter, 30 MHz output, continuously tunable. Use with R-257 for triple conversion superhet. Shp. wt. 10 lbs. R-257 U Receiver, 25 50 MHz FM, single channel, dual conversion, xUl control, 21 tubes, with Lech manual. Shp. wt. 26...

Receiver

Benischek WB6CDU 83Q2 Rath burn Ave. Northridge CA 91324 Many articles in the past have been written on converters. But this one is different in thai it is designed to use an FM broadcast receiver as the tuneable i-f and preassembted modules as much as possible, Most two meter converters have had their output on either 10 or 20 meters. For the beginner, this alone could be a drawback in that he may not have a general coverage receiver. This project uses an ordinary FM broadcast band...

Rtty

49 Frequency Measuring System 11 . . _ , K5DUS 60 Repeater Keying Line 63 SSTV 80 Two Meter 83 AH Purpose Metering Circuit . . - ,WA0ABI 86 Are FET's Really 89 If Your Counter input's 91 TR 22 97 Transistor RF Power 102 Light Bulh Power 105 Economy Filters for 108 Capacity 116 Key er For outdated transmitters. 118 Gonset Linear Modification , - W6HGX 125 A Time for A discussion of time. 142 IC Protection COVER Apropos of St. Valentine's Day, we have Judi Light encovered or perhaps uncovered....

Up To Watts

Swan was the first to provide a low cost single sideband transceiver the average ham could afford. Again, Swan leads the field with state-of-the-art concepts Selectable Sideband, 80-10 Meters Semi-CW Break-in and Monitor Noise Blanker, with Threshold Control No Transmitter Tuning Infinite VSWR Protection Receiver uses FET's, IC's, and Operational Amplifiers IF Derived AGC Minimized Front-end Overload, Distortion and Cross-modulation Mobile is First Class Operates directly from 12 volt DC...

Boonton A

New Haven, Conn. 06512 Phone 203-467-0148 Model MT 42 Mobile Unit 450 MHz 18 Watt Transistor Power Supply with accessories . . . . 89 MT 42 Receiver strip only . . . . 30 MANN COMMUNICATIONS amp ELECTRONICS, INC. 28710 CANWOOD ROAD P. O. DRAWER M Model T43GGV Mobile Unit 150 MHz 30 Watt Vibrator Power Supply Another shipment just received. Alpha-numerics keyboard excellent condition. Once again we expect an early sellout. Price of 35 includes prepaid...

R L Drake Company

540 Richard St., Miamisburg, Ohio 45342 513 866-2421 Telex 288-017 Gus Browning W4BPD Drawer DX Cordova SC 29039 Gus Browning W4BPD Drawer DX Cordova SC 29039 Here goes my second month as DX Editor for 73 Magazine, hope by now that ail you DX'ers out there will have the message and start sending me direct if possible ail the DX news you come across. Keep in mind that I have a leadl date of 2 months. Of course t can and WILL use the info that would be too late for this magazine in my weekly...

W F Swilljr Wicker St Highland In

Keep up the good design on the magazine covers, especially like the October issue. Re Gravity Abecedarium, Nov. 72, Par. 7 It seems to me that Kepler did a lot more than obtain excellent observational data ' so that Newton was able to show that his principle of universal gravity did in fact explain beautifully the complex motions of the planet According to the Encyclopedia Britannica, ASTRONOMY , '54, Kepler's 3rd law, being a necessary consequence of the law of...