Radio Amateur 09-1974

Lafayette 99 90375

MODULATOR-LAFAYETTE CAT NO. 99E9037& + 9V CJ -32 oF Rl-470 TO Itct for desirtd voice I*ve0 C2 - SO DF OSt-iNT XTAL OX SERIES HI FREQ. LI- 10T MO. 22 AWG ENAMEL ON 1 4 m DlA CERAMIC SLUG TUNED FORM L2-2T NO. 22 AWG ENAMEL ON BOTTOM COLO END) OF Lr Tl-MIN MIKE XFMR-LAFAYETTE NO 99E60345 T2-M N MOD XFMR-LAFAYETTE TYPE AR S2 Fig. J. Modulator - Laiayette Cat. No. 99E90375. Parts Ql RCA SK3019 CI 22 pF C2 50 pF RFC Z-50 LI 10T No. 22 enamel on Ya in. iron core, ceramic slug tuned. L2 2T No. 22...

Uitu Geneve

The Jet d Eau de la Rade, thrusting 400,000 gallons of water 427 feet info he air every hour appears to he much less than the World s tallest fountain from my comfortable window seat 5,000 feet above the lake. Spying Geneva through my port window oh Air France flight No 026 from somewhere in the Mediterranean is just as exciting now as the first time 1 viewed it one year ago. The model-like city as well as the horizon disappear from view as we bank right beginning our final descent to Geneva...

Programmable Iamic Cmos Keyer

The long desire to have a programmable CW keyer has been nourished many times by the recent articles in ham radio magazines. 1 have not been entirely satisi ied with any of the circuits because they contained only Read Only Memories (ROM) which once programmed could not easily be changed, or those that did contain programmable memories were limited in storage capacity and not easily programmed. I decided to build a programmable keyer using read write Random Access Memories ( RAM) with a large...

Antenna Noise Bridge

The new R-X Noise Bridge by Palomar Engineers measures both resistive and reactive components of antenna impedance. The resonant frequency of an antenna as well as its feed point resistance is easily found. The ability of the bridge to measure reactance is a useful feature not found in previously available noise bridges, he off-resonance impedance can be measured and it is easy to tell whetiner the resonant frequency is lower or higher than expected. This greatly simplifies tuning and matching....

Cushcraft Ringo Ranger

Cushcraft has announced a series of Ringo antennas which have three half waves in phase by virtue of an eighth wave phasing stub. There are models for the 146, 220 and 450 MHz bands. This new antenna has both added gain over a regular Ringo antenna plus greater concentration of the signal on the horizon, where you normally desire it. Ringo owners may prefer to get a conversion kit to extend their present antennas. These, too, are avail able from Cushcraft distributors. Cushcraft clams to sell...

North Tucker Shawnee

Secondly, although 80 meters is generally considered to be a good band for round table QSOs, and traffic handling, it is also one of our better DX bands, especially during the hours of local darkness. The question is often raised as to just what the best antenna is for 80 meter DX work. The answer to this question will depend largely on what the particular amateur concerned can provide in the way of a mast, or supporting structure an area, or space in which to...

Af Oscllator

Pick up the signal much beyond the 8Va in. point. Pretty soon in your receiver 'peaking work you get to that signal that may be but a tenth of a microvolt or so, and you begin dreaming about cryogenic front ends, masers, and such As mentioned, every fraction of a decibel lower in noise figure, every improvement in sensitivity comes out rigorously and relentlessly on that slide dial. You can easily check which of your low-noise transistors is really low, whether that MOSFET will do a better or...

Noise Bridge

Find its resonant frequency. Find R and X off resonance. Independent R & X dials greatly simplify tuning beams, arrays. Compact, lightweight, battery operated* Simple to use. Self contained, Broadband 1-100 MHz. Free brochure on request. Order direct. 39.95 PPD U S. & Canada (add sales tax in Calif.) The component values are dependent upon the impedance oi the audio circuit, and those shown in Fig, 2 are suitable for the 50K load (af gain poientiometer) in my...

West Ghent Ny

Northeast States 160 Meter Association annua fall meeting at Kozet's Restaurant, West Ghent near Hudson . Flea market, dinner, prizes, starts 2 pm. Dinner S5.75 ea, reservations W1JEC, Box 44, West Gran by CT 06090. The ARRL Midwest Convention will be held at the Marina Inn, South Sioux City NB sponsored by the 3900 Club. Theme tribute to handicapped amateurs, Friday noon start. QCWA dinner, portable repeater, SSTV, ATV, Amsat demo, QRP session, ARRL forum, repeater forum, traffic forum, flea...

Amsat Presentation Before

On July 9th Perry Kline of Amsat gave an interesting presentation before approximately 30 members of the FCC in Washington. That amateurs have been able to accomplish so much with such minimal expenditure is a continuing source of amazement to government officials. The fellows working on the Oscar projects beg, borrow and. . .ahem .just about everything from the solar panels to Terry Fox WB4JFI 3612 Barcro ft View 302 Baileys Crossroads VA 22041 I have talked to several ATVers in our area that...

New Communication Combination

With Both Base Station and Mobile 220 MHz Capability ON TOP, THE FM-21 220 MjHz TRANSCEIVER Here's a combination thai'M put you in the world of 220 MHz in style. - . and at a reasonable cost. First, the Clegg FM-21 Transceiver with its unique crystal saver frequency control. It uses just one crystal in any channel. . one crystal gives you a separate transmit and receive frequency as well as automatic 1.6 MHz programming in the repeat mode. It's got a host of other features too. Second. , . an...

Bassett Vacuum Trap Antenna System

Complete packaged multiband antenna systems employing the famous Bassett Sealed Resonators and Balun from which air has been removed and replaced with pure helium at one atmosphere. Operating bands are indicated by model designation, The famous sealed helium filled Saluni . , , employed with the DGA Series Antenna Systems Solderless center insulator and easily handles more than full legal power while reducing unwanted coax radiation Equ piped w.th a special SO 239 type coa* connector and...

Selectoject

Chromed bumpers, padded knobs, emission controls and oh yes, op amps. Various forms of the select-o-ject have been around for quite awhile. This is device which can either peak or notch a tunable audio frequency. Older versions of this device suffered, however, from a drawback which rendered them somewhat inconvient to use. The gain and the tuned frequency interacted in such a way that a two-handed approach to the beast was necessary, an unhandy trait during the best of contests. The above...

Morse Code Specifications

During the making of the 73 Morse Code study tapes there was a question of what actually constituted 13-per. Thirteen five letter code groups, obviously but how long should each letter be A five e group goes by awfully quickly, while a five y group hangs in there for a long time. It turned out that the FCC has surmounted this problem by setting up the standard for word length -they use the word ' paris for reference. Using this, we set up the 73 study tapes to match the FCC standard of speed....

Type Khp Relay Pdt A Contacts

723 DIP variable regulator chip MOV, or - output p ISO MA OA with external pass transistor With diagrams for many app1 feat i ons. This calculator chip has a full four-tune tion memory, which is controlled by four keys -HM adds firitr into memory , -M subtracts entry from memory , CM clear memory, without clearing rest of registers , RM read memory or use as entry . 12-Digit display and calculate 3, 4t or 5 Leading zero suppression 7-Segment multiplexed output True credit sign display Single...

Wilson Sm Hand Held Watt Fm Transceiver

Rubber Flex Antenna Complete Set NiCad Batteries Leather Case Three Sets of Crystals 16 76, 34 94, 94 94, Other Available at 8.00 Pr. 6 Channel Operation, Individual Trimmers On All TX and TR Xtals. All Xtals Plug In. 10,7 IF and 455 KC IF Ceramic Filter. t3 Microvolt Sensitivity For 20dB QT Size 8-7 8 x 17 8 x 2 7 8 Inches. Weight 1 lb. 4 counces, Less Battery. Current Drain Rx 14MA TX 380 MA, ACCESSORIES SMI Speaker Mike 24.00 BCI Battery Charger 29.95 141 OA Amplifier Mobile Mount 99.00 To...