Bob, Earl and folks, Earl's comments are correct, but CAL FIL must also be run before calibration is complete. Each BFO must be changed by at least one 'notch' and moved back to the same frequency (aqssuming the filters were properly set before). The K2 must detect that each BFO has been changed because that is the only time new values are written to EEPROM.
73, Don W3FPR -----Original Message----- "I used Wayne Burdick's article to calibrate my K2. When I first tuned in WWV, the zero beat was at 9999.5. I adjusted c22 & measured TP1(VCO) & TP2(BFO) until the two test points matched. Now WWV zero beats at 10000.5." ---------- 500 Hz is a big error. You can get it much closer. ========== "Should I have set my dial to 10000.00 & then adjusted C22?." ---------- No! Nothing will change until you do a CAL PLL after adjusting C22. ========== There are a number of methods of getting the 4000 kHz xtal oscillator on frequency by adjusting C22. Without a frequency counter, one of the easiest is to tune in 20 MHz WWV on your IC-756Pro. Use a short piece of flexible insulated wire for the antenna on the 756Pro and bring the end of that antenna near the 4 MHz oscillator in the K2. You'll hear the 5th harmonic of the 4 MHZ oscillator beating with WWV (best to use the AM mode on the 756Pro and wait for those times when WWV is not transmitting a tone). When you hear the heterodyne beat between the 5th harmonic of the K2's 4 MHz oscillator and 20 MHz WWV, adjust C22 to zero beat the heterodyne. Anytime you adjust C22, you must follow with a CAL PLL. Then check your K2's frequency dial readout accuracy. 73, de Earl, K6SE -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.344 / Virus Database: 267.10.18/88 - Release Date: 9/1/2005 _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
