Isotron

CO 80816 137 Manchester Dn Florissant. CO 80816 SMDs. It's not a difficult process, but you may warn to gel some guidance if this is your first SMD project.) Another advantage of ordering the factory-built unil is that it comes with the TXCO as standard equipment. With the kit, the TXCO is an option, which adds 40 to the cost Once I decided to go with the XCO option, buying the factory-built unit became even more attractive. Setting the frequency on the R301 is...

Rhz

A pre sel Ci for can reduce du IM produi ts. nF2. where m and n are either integers < ir zero. The mixing products that are the worst case are the third-order difference signals. The third-order products are 2FJ + l 2, 2F1 - F2, 21 2 + FK and 2F2 -PL Of these, the difference versions arc the nastiest Let's consider two cases. Suppose you uant to cops a signal on 14,22ii MHz. and there is a sirong U mdenboorner carrier at 14.240 kHz. The third-order IM products are 2FI + F2 42.68 MH 2F1 -...

Info

I bought their latest callbook. issued in 1993 and listing over 8,000 hams. The callbook is not updated, even to the date of publishing I found several hams licensed in 1990-92, but other people ire listed under their callsigns. If you cannot hear many XE calls on the air, it is because most of them are on two meters or inactive. I was told that while the number of hams in most countries is increasing, in Mexico is decreasing, mostly because no new licenses were issued during the last couple of...

Rf Transistors Tubes

MRF455, MB8719. 2SC13 7, 2SC2029, MRF454. 2SC3133, 4CX250B, 12DQ6. 6KG6A, etc. WESTGATE 1 (800) 213-4563. SNB6G00 Cash for Collins Buy any Coltins Equipment. Leo KJ6HI. Tel FAX (310) 670*6969 MAHLON LOOMfS, INVENTOR OF RADIO by Thomas Appleby (copyright 1967). Second printing available from JOHAN K.V SVANHOLM N3RF, SVANHOLM RESEARCH LABORATORIES, P.O Box 81, Washington DC 20044. Please send S25 oo donation with 5,00 lor S& H.

Qrp

See this was nol going to be an easy project Once again, while 1 had the desoldering iron hot, I installed an H-pin socket for the NE602 chip used for I he receiver mixer* Although a socket is not desired in this location, the added lead length may c iuse unwanted inductance to rear its pesky head. I figured a few more chip swaps would surely destro) the PC hoard's foil pattern. A good dose of denatured alcohol was used to clean up the PC hoard. All that desoldering and solder flux made a mess...

Nov

OK The Enid Hamfest Group wi)l hold the Enid Hamfest ai Oxford & 4th Streets, at the Garfield County Fairgrounds (Hoover Bldg.), 8 a.m,-5 p,m. Admission S2. iabies SI each. Special features Free doughnuts and coffee rn the morning, free hot dogs and soda at noon VE exams at 1 p.m. Contact Tom Worth N5L VT. (580) 233-8473. E-mail NSLWT9H0TMAILC0M or Fred Self ridge N50JX. (580) 242-3551 E-mail FREDNNEL tONET.NET .Ta k-mon 147.151*) Of 444.400(+) SORRENTO, FL A Hamfest. Computer Show and...

Synthesized Fm

We recently introduced new vhf fm exciters and receivers which do not require channel crystals. NOW,., uhf moctules are also available Exciters and Receivers provide high quality nefm and Isk operation Features include - Dip switch frequency sdeetton. * Brc ep tion a I mo dufati on for vo ice and eres s, * Very low noise synthesiier for repeater senrice. * Direct frn for data up to 9600 baud. * TCXO for tight frequency accuracy in wide range of environmental conditions. * Next day shipping. No...

Output

Schematic of FoxTTL 2-meter transmitter capacitors and three RF chokcs. the fundamental (483 MHz) an< J the second harmonic are suppressed, and the third harmonic, on 144.900 MHz, remains intact. Power oulputends up being around live to 15 milliwatts, depending on battery voltage. The beacon consumes about 35 niA, and you can expect about 10 hours of battery life when using a nine-voit alkaline battery. The audio oscillator section is created using a 555 timer The configuration of the...

M Bva Nye Viking Kin Antenna Tuner

Filters and more, write for a free catalog and dealer info. WM. M. NYE COMPANY fNC. PO BOX 1877, PRIEST FUVER ID B3856 visri us athtlp www.skyport.com rogue-press.1 nyel.htm Tuners.Telegraph keys. Filters and more, write for a free catalog and dealer info. WM. M. NYE COMPANY fNC. PO BOX 1877, PRIEST FUVER ID B3856 visri us athtlp www.skyport.com rogue-press.1 nyel.htm Compl t inventory for servicing Amateur, Marine, and Commercial Communications Equipment, Transmitting...

Motrac Channel Element

The first step in ihe process was lo determine the maximum and minimum suppl voltage that was needed. In my case, ihe oscillator s output peaked at 12.5 V and ceased to oscillate at 5.5 V. The task then involved selecting the values of resistors lv2 and to achieve a nearly full pot rotation lo cover the range from 5.5 V to 12.5 V. This expectation was almost achieved by using standard resistor values. Some patching of the R value could have improved the li gt w end control, but when in use, the...

TO

Layout of the bandpass filter. leads. This approach further reduces the overall parLs count. You've seen it here first If it works, don't knock it Point-to-point soldering on a small perfboard will work with ithis project, although 1 have found that deviation levels are affected, depending on parts placement and lead length. Boards and parts available See end of article. The high-pass filter consisting ot four capacitors and three chokes, is not part of the PC board layout. The...

Jrc

160-10 Meters PLUS 6 Meter Transceiver 160-10 Meters PLUS 6 Meter Transceiver Fifteen reasons why your next transceiver should be a JST-245 1 AJI-Mode Operation SSB.CW.AM AFSK.FM on all HF amateur bands and 6 meters. JST-145, same as JST-245 but without 6 meters and built-in antenna tuner. MOSFET POWER AMPLIFIER Final PA utilizes RF MOSFETs to achieve low distortion and high durability Raied output is 10 to 150 watts on all bands including 6 meters AUTOMATIC ANTENNA TUNER Auto tuner included as...

Meter Ht Radio

Cherokee, the new technology leader in wireless communications, is pleased to offer our new AH-50 HT, the smallest, easiest to use 6 meter radio in the world. Best of all, our unique design, when combined with the Cherokee Mobil-Com adapter, creates the world's smallest mobile 6 meter radio. A 6 meter HT that's also a mobile Of course, and only from Cherokee With a Cherokee radio, For more information on the amazing AH-50 and where you can purchase it, call us at 1-800-259-0959, or visit us on...

BNB

We are happy to provide Ham Help free on a space-available basis. in make our job easier and to ensure that your listing is correct. please type or prim your request dearly, double-spaced, on a full I 2 v -inch shed oj paper. Use upper- and lownase letters u7 ere appropriate. A 1stk print numbers, t artfully. A I r for example, can he misread as the letters L i. I. or even the number 7. Specifi-calty mention that your message i s for the Ham Help lt oluwn. Please remember to acknowledge...

Ncg Company

1275 U Grove Street CA 92805 8 0 962 2611 714 630-4541 Fax ill4 630-7024 George Pataki WB2AQC 84-47 Kendrick Place Jamaica NY 11432 sualiy. when I visit the amateurs in a foreign country I go around to various cities to see as man gt hams as I can. During my recent trip, with one exception. I stayed only in a single place Mexico Ciiv w hich u ilh its 20 million inhabitants is as hig as many other entire countries. Mexico is very large, so going from one major city to another requires long...