-----Original Message----- >Agree with what you say, but I get a strong birdie at 28.276 without the >KPA100 on. This one I think is LO + BFO , that is 23.361 + 4.915 = 28.276, >nominal freqs. Being first order it is also strong. Other products + mLO +/- nBFO also >converge here, but are not a problem in my K2. ---------------
I cannot really explain this one without a 18432 oscillator in the K2. As far as I can see the sum above is equal to the VFO + IF, so in that case it would be valid for any frequency in the 15, 12, and 10 m bands? -------------------- >There is no spur at 28.262 MHz with the KPA100 on as its crystal frequency is 16,289 MHz >(later build?). But that oscillator might be contributing to the other spurs. I have yet to >sit down and do a worst case analysis. -------------------- The 16289 is the oscillator frequency of the first run of KPA100's which was later changed to 18432. The reason has been given as: "The modification kit also includes an 18.432 MHz replacement crystal for use at X1. A new frequency was chosen to improve rejection of spurious products, although the KPA100 was in compliance at the original frequency." Maybe this is concerned with spurious outputs from the transmitter? -and probably someone on the list, beta-testers of the KPA100 perhaps, would know? 16289, I believe is the oscillator frequency of the KIO2 and the KRC2 unless they have been changed also. 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
