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....

1

Modified circuit to rep lace the R347 in the sweep circuit in Fig, 1. In use the original decade selector chooses the correct capacitor for the desired decade, then the new switch will choose the multiplier which wUl give the sweep XI, X2, or X0.5. When buying your switch be certain to get one small enough to fit in the available panel space beside the decade switch. As a small finishing touch, spend the few extra cents to buy the Heathkit H2 pointer knob and its insert. The result will...

Waabi

GENAVE GTX-600 A Brand New 6 Meter Transceiver As the two meter FM band fills up in most urban areas, repeater groups have been looking around for other bands to populate. Some have gone the 220MHz route particularly now that Clegg has been delivering 220 repeaters - while others have been going to six meters. The fact is that six has a whole lot to recommend it. The ground wave coverage on six is a lot better than two meters, with many repeater groups finding it up to half again as good in...

Ts

Kenwood's go every place , - . do everything transceiver The new TS-520 is the transceiver you have wanted, but could not buy until now. It is a non-compromise, do everything, go everywhere 5 band transceiver for SSB or CW that performs equally well at home, in an automobile, airplane, boat or trailer. The TS-520 features built-in AC power supply, built-in 12 volt DC power supply, built-in VOX with adjustable gain delay and anti-VOX. The price 629.00 The R-599A is the most complete receiver...

Wbkvl

HAM STATION FOR BLIND HAMS Set up by local club Blind amateurs who are taking the guide dog training course at the B ind Center in San Rafael CA now can talk through the local repeaters as a result of the kind work done by the members of the George S. Ladd Pioneer Radio Club in San Francisco. The ctub set up a G.E. Progress line rig and antenna for the school. Watch for the station via WR6ABM or WR6ACS when you're in the area. Ed Clegg W2LOY is not only one of the top VHP equipment designers in...

Introducing

Model PD-301 is a 300 MHz prescaler designed to extend the range of your counter 10 times. This prescaler has a built-in preamp with a sensitivity of better than 50 mV at 150 MHz, 1 00 mV at 260 MHz, and 1 75 mV at 300 MHz. The 95H90 scaler is rated at typical 320 MHz, To insure enough drive for all counters, a post amp, was built-in, The prescaler has a self-contained power supply regulated at plus-minus ,08 , The PD-301 is supplied without power supply if desired (input 50 ohms) (output Hi...

Contest

The QSL winner this month is Eugene Sedberry W8JUL with a beautiful full color QSL card. On the back it says, One of my bird friends and I discuss the weather, DX, what's for dinner and other subjects of serious mutual interest at Iron County QTH. A one-year subscription exten sion is the prize. How about your QSL Is it different enough to win the monthly QSL contest If not, why not Your QSL expresses YOU Are you special Bif Pasternak WA2HVK 6 14732 B ythe Street * 17 Panorama City CA 91402 Bet...

Wbjni

Pinner WB4MYL 7304 Lorenzo Lane Louisville KY 40228 The appearance of the 1C has made apparent the need for a unit which would test and identify both marked and unmarked ICs. The units referred to are available from Poly-Pa ks. They are TTL, 14DIP at the attractive price of 60 55.00, Several groups of these units have been purchased and of these, more than 80 were identified. The balance were assumed to be defective or not properly identified for testA block diagram of the box...

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...

Amplitude

L Severe v eather warning system. event is 'observed.1' The accumulation display, Fig. 1, provides a readout with a three dimensional effect. This accumulation presents trends and concentrations that are not noticeable during realtime observation. Low activity fronts that produce only a few events per minute in the early stages are easily detected. The accumulation also improves the directional accuracy since the average of many events can be measured. The best monitoring station appears...

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...

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...

Kadl

High speed camera catches apple passing through bullet. head. R4, R5, and R form a divider to supply the proper voltage to ignition capacitor C3. As the charge in ihe energy storage capacitors reaches the proper level, lamp l lights. When the shutter contacts close, C3 discharges through the primary of T j supplying a high-voltage pulse lo the ignition electrode to fire the lamp. Since the action that initiates the ignition process is a contact closure, a wide range of tricks are possible. The...

Info

1 A - i I . cjr gt lv Li DfJ 11 Q ft dljl p-fjl 7 t gt l I I'O n ll UM -,-r ti.fl rtw j r i j caluma gt nm iun gt r iDj blt m-. Bn ad U ' zi h Al t rr,mDJi by Did h.jrr Fl ihip.mil a i S i rihy.1 J i. t . T ie c lt ii iri r. .T.nr Iftji O C l tqj fncv p E r QfQuii riiLlJt . rr sh Q ihvrBCidJi ai 1 iart.v. i 1 nt

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...

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...

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....

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...

O

Fig, 2, Showing the implementation of Fig. lf This is easily derived by those handy with phasor algebra. From equation I we can easily list the important traits of the circuit of Fig. 1 1 When x is 0, G is 1 at 180 3 When x is infinite, G is I at 0 4 When x is anything at all, the absolute magnitude of G is unity as advertised, I he conditions of zero source impedance and unloaded output are very important, as any departure from those conditions will upset equation 1 beyond recognition, and...

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...

Re Kpmm

I really enjoyed the article by Wretched Coward in the April issue of 73. Always did wonder what happened to him. Perhaps this might be 73's answer to that chap who use to write that column with the Feenix byline. One question Js it true that 'PMM never made it past the Technician class What do you think the possibilities are for getting modifications to the Repeater rules I operate a 6m repeater on top of a local mountain and this mountain is approximately 1500 feet high, so we must use a...

New

Oper, 3Q 500 Ml QfllV 4 0Q I Cfy ldi contiailed foi fasl and easy opertlion Battery powtrid with AA pencHls Phone or write Skip W9HAK lor complete infoimajtitifi Di.'il 812-4762121 Phone or write Skip W9HAK lor complete infoimajtitifi Di.'il 812-4762121 A by fitt . t mail oti y ORDER INFO Sertd check or money ordrr for S85.00 plus SI 25 for handling Imf. irx.s residents and 4 gt ales tax. CmialS for M6 94 Mb S3.95 va Ail other trefl 57 10

Kc From Kc

Fig. 2, Response of Amperex 2422 540 50021 crystal filter, Response is not perfectly symmetrical, especially at high attenuations, The system works effectively because clipping of the SSB signal at an rf level produces far less distortion products tha i if the audio signal were directly clipped, A hard clipped audio signal cannot, in fact, be fed into an SSB transmitter because the transmitter cannot reproduce the square wave form of a hard clipped audio signal, In-band audio distortion...

Gzcz

Here, reprinted from the fine club bulletin of the K1 FFK repeater group, The Squetch I ale ' is what happened to one of their errant members who decided to kachunk the repeater on a regular basis- Well people how does K1FFK sound at 6 00 AM now days No more urppppps to worry us. am probably beating an old ho se, but for the people who were not aware of what was going on, I'll tell it one last time. WA2CSQ asked me if I would like to join htm and Peg WB2RZZ on a fox hunt, in hopes of tracking...

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...

Kvxl

6m ORP Ttansmitlei d h . . . . . . ,. , RF SpMch CJipper Lecture Beamed o C ifc , . , . i . Lemert My Favorite Band 80m . , . . . . . . t , . . . - , . TilH Audi A VisiMo 4U1ITU Geneva You loo can be rajv E3X just bring your Nckel MM Jit Youi Voltage 1 20V Vanae on Width Sjltfllitt on Your SSTV WA8DQT Do Something About , . - -K3SJMS

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...

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...

Ic

REDUCE YOUR PROJECT COSTS MONEY BACK GUARANTEE 24 HOUR SHIPMENT ALL TESTED AND GUARANTEED 2M35G3 TYPE HF Amp amp QSC to 1 GH Ipl 2N9181 2N3565 TYPE Gen, Purpose Hrgh Gain TOTOGi 2N3691 TYPE GP Amp io 25 mAand 50 MHz 2IM386G TYPE RF Pwr Amp 1 2 W 100 600 MH 21M39G3 TYPE GP Amp amp Sw to 100 mA and 3D MH 2 N 3904 TYPE GP Amp amp Sw to 100mA TO 921 2N3919 TYPE RF Pwr Amp 3 5 W j 3 30 MHz Asson. NPN GP TYPES, 2N3565, 2N3641, etc, 15 PNP 2N3638 TYPE Gun, Purpose Amp amp Sw 2N4249 TYPE Low Nmsr Audio...