Gdo Coil Extension

Grid dipper is a great piece of test equipment and belongs wherever rf equipment is to be designed, constructed, or serviced. All writings on the subject seem to be prefaced wilh this comment, and I hesitate to break tradition. Now that the formalities are over, we will proceed with the subject matter, Probably the one most inconvenient feature of all grid dip meters is the physical size of the instrument. This holds true for the two unit commercial models as well as the more common...

Info

ANY REASONABLE OFFER accepted for DX100, SX100, DX40, TBS50, Globe BC34K. h50GB 8503. 88LF, T18, T19, 120. Box 8352, Savannah, GA 31402. FACSIMILE Frequency Shift Facsimile Converter CV-2A, in like new physical condition S5& Full size AN TXC-1 facsimile recorder (weather map type) S99. Both together SI45. Small size + Desk-Fax ' transceivers - S15. two for 25. Also, V HtJi n tv l of fax papers. Stamp for list. Jim Cooper. W2HVH, PO Box 73-Mt Paramus, NJ 07672. SALE Drake Novice XMTR 2-NT -...

Joy

Figure 1 is a schematic Jiagrum of the adapter. Metal work consists of components from the Lektrok.itchassis system. Four 4 x 4 in. chassis plates were used as follows Plate No. 1 carries the 6C4 buffer amplifier, first i-f transformer, 6AU6 first limiter, second i-f transformer, 6AU6 second limiter* discriminator transformer and 6AL5 discriminator. Plate No. 2 carries two 5751 tubes, comprising the squelch and first audio section. the 6BQ5 audio power amplifier and the audio power output...

Lee Electronic Labs

Massachusetts 02172 Sixer underchassis shows location of added components. This doesn't really change the selectivity characteristics it merely spreads the stations out a bit. It does make a difference when mobiling, however, and I found it to be worthwhile. Figure 4 shows the circuit change. My thanks to Bob Wille, K2RQU, for his help during testing the modifications, and to Court Packer for his photography, A precision engineered profetiional quality...

Output

Free vidicons are no longer available but can be purchased from the same source for 100, This price is far below the selling price of this vidicon for commercial use. The slow scan 7290 vidicon target can hold an electrical image for several seconds once it has been exposed to an image. In the 7290 SS camera shown in Fig. 1*10, an electrically-operated shutter exposes the target for about 1 30 second and then the image is electrically scanned for the next eight seconds. Similar to flying spot...

Wajz

Speech Clipping for Single Sideband W. K. Squires & E. T. Clegg QST, July, 1964. 2. Radiotron Designer's Handbook, LangfordSmith, Chapter 16, 2 (vi). Volume compression plus limiting. 3. Tape Compressor Walt Henry, Electronics illustrated, July, 1966. Jim Fisk W1DTY 73 Magazine, March, 1967, p. 5A. Premodulation Speech Clipping and Filtering W. VV. Smith W6CBX, QST, February, 1946. A Clipper-Preamp. for A. M. Gary Blake Jordan WB6MOC CQ, July, 1966. RI Clippers for S.S.B. William Sabin...

For Frustra

Tlhe Heathkit HW-16 transceiver is j fine, inexpensive rig for CW, and for this reason many Novices use it. Its excellent selectivity (500 Hz) makes copying CW easy and pleasurable. However, it is a rare Novice who doesn't get bored occasionally with code and would prefer to listen on the phone bands for awhile. It is here that the good selectivity of the HW-16 works against the Novice, The rig s narrow bandspread makes copying SSB or AM nearly impossible. Since the HW-I6 covers a portion of...

STATION

Since each locale will have its own preference as to bands, locations, and available equipment I will deal in broad terms where possible. Specific mentions of equipment will refer only to equipment manufactured by Motorola Communications and Electronics, Inc. This specialization as to references is for two reasons I am more familiar with Motorola equipment than any other brand and, because Motorola is now releasing large quantities of equipment to the amateur market in certain areas.1 The types...

Electronic Feather Touch

The sohd-state design detects the mere touch of your finger and eliminates such problems as contact bounce, proper adjustments and dirty contacts. Operates with all keyers. Weighted. 22.95, 25.95 (With SPDT Switch Option.) LOOK - The CRICKET is here - and it has the jump on alt the others in its field This low-cost keyer has more features for your dollar than all the others in its price range. Even some in a higher price range Go ahead look around - compare the rest Then buy the BEST - Data...

Special Offer

BC Dto 7 Segment Decoder driver PLESSEY SL403D 3.5 W AUDIO AMP IC HI Fl QUALITY 3.95 The MINITRON readout is a miniature direct viewed incandescent filament (7-Segment) display in a 16-pin DIP with a hermetically sealed front lens. Size and appearance are very similar to LED readouts. The big different is in the price. Any cofor filter can be used. MC 1550 Motorola RF amp S 1.80 CA3020 RCA Ys W audio 3.07 CA3020A RCA 1 audio S3.92 CA3028A RCA RF amp 1.77 CA3001 RCA 6.66 MC1306P Motorola W...

Meter Beams

Alt W7GVA beam elements are constructed of the finest aluminum available, 6063T832 and 6061T6 both top quality alloys. All Wilson Electronics beams have a 3 O.D, boom made of top grade aluminum 6063-T6. All our beams come complete with adjustable reactance tuned gamma match network which can handle 4 KW pJus on CW and SSB. Model No. WILSON MONO BAND BEAMS M340 3 ELE, 40 METER BEAM full Gain 8.5 DB gain. Boom length 38 5 ft. 3 OD .200 wall to ,065. M240 2 ELE. 40 METER BEAM full Gain 5.5 08....

This Months Feature Item

Ii1 u ihe kit vim 11 ivi beflJi viiit M ' fOT S Ofiip.ii it actually M gt . M J ihirt pOckm 3 13 16 k 4 6 0 'M - li perform ewtry function VDv rtOuld -vpf-cl in A cjirijio tiL TatjQn. afliJ full noaTLF gt g d irns1 T hr u rl H powvrrd try I con ij ned iiatttr .- jnd jsti S d lt jir L.ED ri piays T calculation I gt r riy . r-q -i J gt j. -. ,ilV carind arge icaiff rnTecjra '0n 1 LSI i -I ItQdenl. eniJiniii-F lale amp ma . jiXOliMlJfit. or afiyorn-whm vvould likft loit accurate an wsft, his...

What You See Is What

When buying 2 meter FM equipment or any other Ham gear, for that matter . SWAN ELECTRONICS gives you much more a lot of which you can't see INVESTIGATE BEFORE YOU BUY Compare Swan's FM-121 OA for, example, to other 2 meter FM transceivers with a rated RF output of 10 watts, The FM-121 OA gives you 144 channel combinations through independent switching of 12 transmit and 12 receive frequencies from 144 to 148 mHz, Eight crystals not just 3 . . . TRANSMIT 146.22, 146.34, 146,76 amp 146.94 mHz...

General Electric Rca Motorola

' . . i i-i i- gt i gt z-zv z- -z- gt ' -z -- xfiK- - - - 6 12 volt, 30 watts, vibrator power supply. With accessories, add 30 Earlier serial number, 28 plus 30. for accessories 6 12 volt, 30 watts, vibrator power supply. Earlier serial number, 48 plus 30. for accessories 15,000 2-way FM mobile units in stock

Rie

Particular case, the possibihty of directly replacing the transformer was not practical as it had a special winding to supply the HV to the scope rectifier along with the EH This meant, of course, that two transformers would normally be required for replacement. With the current cost of transformers as high as it is, the repair prospect was quite gloomy. I have built several special purpose RTT Y oscilloscopes and have always found a considerable magnetic distortion problem to exist when they...

Reader Service

Please either tear out this list of advertisers and send it in to 73 with as many boxes cheeked off as you would like to see brochures, data sheets or catalogs or else make a copy and send that in. Include your zip code, please. Adirondack 59 Freck 71 Alden 121 Glass, Sid 53 Andy 147 Goodheart 136 Astatic 19 Gregory 128 ATV 71 H amp L 118 Babylon 155 Hal 123 B amp F 149 Hamtronics 48, 49 Call book 71 Heath 37 Circuit Spec. 134 Henry 9, 112 n Comm. Prod. 71 o International Sig. 51 n Comm. Spec....

Parallel Set Up Of A Capacitor

He circuit in Fig, 1 is as simple a modulated transmitter as can be built, it has been useful in testing two meter FM receivers, alignment, rf i-f peaking and as a shorl range transmitter. When used as an FM transmitter or wireless mike the range without an antenna is 100 yards plus and the audio is excellent. The components may be wired on a terminal strip or soldered to a small 2x2 in. piece of copper clad board and then installed in a small minibox with the end cut out. The box will...

Zoo Hz

If you doubt that a quality picture can have such a restricted bandwidth, visit a slow scanner and watch pictures produced from an inexpensive cassette recorder operating at 1 7 8 Lp.s. Fig, 1-8. BJock diagram of a slow scan TV monitor. video and sync signals that were generated by the slow scan camera or flying spot scanner. Usually full wave rectification is lo be preferred since the low pass filter following the sync and video detector can more easily filter ihe subcarrier components...

Sampling Line Moves From Left To Right In Seconds

Wb8dqt Televisor Video

SampJing method of producing a slow scan picture. W7ABW W0LMD, and others have produced some excellent pictures using the Phillips plumbieon. These tubes are available as pull-outs from color cameras here in American and are available at TV stations in some parts of the country. Plumbicons, with their relatively high target resistivity are quite effective at slow scanning rates and represent an excellent alternative to the 7290 in the open shutter mode. Last but not least comes what...

Pe K

Wr f un supply you wiUi our or Irn Suimind FROM SICICK. Aavailable, 1 OVERFLOW rhuM al th name pri Mfxiiiu - -J Rpfmljr Ovrrfldw dipt nllo mf. Parka ir of ft. ViW Ufriilin 3 lt litruiiilc iTIII Type tif 7-fcrjrmcnt diZpLiv VV'irli rtght-hnitd -i i-imal miinL Rikd 8mA jht nneni at TT I Mojiply nf SV, Design life of 5HJKHI huursu WfJ- 4 447 As i diivrr. In DIP Parkj r, Eich Mm K II SOCKET PINS v 1,, . rnm ral,Ml pm gt it lrjd Hildrrui gt our leg ,fl ti rrt,, NJd in ronttntjou- InfiL- in...

Transformer Primary

0.47 1HM W FltSfSTQRS IN fAHAl I EL - 1 amp OHM6W ANODE SURFACE OR TAB INSULATE FROM CHASSIS to charge until it reaches the PNP emitter potential because the unijunction transistor will always switch and discharge the timing capacitor to ground first. Once the switch closes, it will remain closed until the current flowing through it falls below a critical value, called the holding current. The value of the PNP emitter resistor was chosen so that the collector current of the PNP would always be...

I

Accessory BBLT144D Antenna Hustler 3.4 dB gain 27.95 540 Richard St, Miamisburg, Ohio 45342 Phone 513 866-2421 Teiex 288-017 One of the fellows on the l X-pedition to Navas amp a was musing over what it was that made Navassa so interesting a place for a trip. Why nor go to Antiqua or some other place Navassa h.ts the advantage over most of the oilier spots in the Caribbean it is seldom hammed - it is awfully hard to get to no one lives there -the seas are often against you - The weather is hot...

Contents

4 16 Slow Scan 28 Premodulation Speech Processor W6AJZ Get a 1 10 2S-unit increase in signal 33 Two Buck Signal Generator . , h WB4MYL 35 Transmitters. Then and Now W2FE2 4 1 Practical Amateur FM Repeaters K9STH Next month impractical FM repealers maybe 58 El Cheapo Test Probes WB4MYL SO Prog Line Power Supply - K6VBT Actually this wi t power any surplus FM rig. getting you on FM for beans. 62 Random Accass Switching W9SEK Some push button control circuit ideas G5 Diode Receiver for 432 MHz...

Ful

Wb8dqt Televisor

Ijf Lai Ni W4 G TS of At anM. as seen on Navassa. ijf Lai Ni W4 G TS of At anM. as seen on Navassa. reason for bringing the remains of that antenna back. ihe ride back was i good deal easier than ihe trip to Navassa and many ol Lis were able to stretch out and gel some sleep, at least tor a couple of hours. No sickness this time. We did bum out one engine and IkllI to limp hack at half speed for the J js1 fe w hours on the other engine. We just about ran out of fuel oil too. with only d...