-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Tom Arntzen
I have a birdie at 28019,27 cw and cwr falling slightly during warmup. Since I know that you have a K2/100 and none of the others that answered you I can confirm that the birdie is from KPA100. I also think that you will find a birdie at 28265 +/- that slightly changes when toggling --------------------------- Here's a hypothesis for how the two birdies could be created from the KPA100: 1. Assume a newer KPA100 with oscillator around 18432 (not the old one at 16289). 2. Its 6. harmonic is 110592 kHz 3. To receive 28016.4 kHz, the K2's VFO frequency is 28016.4 - 4915 = 23101.4 4. The VFO's 5. harmonic is 23101.4*5 = 115507 5. The difference between the harmonics of the two oscillators is 115507 - 110592 = 4915 6. 4915 kHz is right in the middle of the IF passband of the K2. In order to get a match at 28019 kHz as has been reported, the KPA100 oscillator has to be shifted to 18434.1 A birdie at 28262 is easier to explain as the image frequency is 28262-2*4915 = 18432 = KPA100 oscillator. 28264 has its image at 18434. Thus if the 18432kHz KPA100 oscillator actually is at 18434, a weak birdie at 28019 and probably a stronger one at 28264 can be explained. Does this make sense? 73 Sverre LA3ZA http://www.qsl.net/la3za/ _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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
