If PC5M's calculations are correct, and these birdies are caused by mixing products of the 4.9136 MHz IF crystals in the K2 and the 18.432 MHz bias supply crystal in the KPA100, and assuming his spreadsheet calculations are correct, it seems that a crystal at 15.8735 MHz (+ or - about 9.5 kHz) would not produce mixing products in any US ham band (including 5.3305 through 5.4065 MHz for 60m). Since this is not a standard crystal frequency, I wonder what the cost would be of a batch of custom crystals at this frequency? It seems that even within general tolerances for calibration and temperature stability for both values of crystals this should be feasible. Like I said, I don't know what the cost of a run of custom crystals would be, but it may be something for the folks at Elecraft to look into for future outgoing KPA100's, and then those of us who wish, could purchase one as a spare part to retrofit our existing amps. Another alternative would be a separate individual purchasing a batch of custom crystals for sale to Elecraft users. Just a thought. What do you all think?
-Ben K1NT _______________________________________________ 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
