Two questions for the group: 1. My K2, serial 5120, has worked flawless since I built it last fall...except that about a week ago, friends on a 20m net I work daily said I was low about 40 Hz in frequency. (Frequency calibration checked occasionally against both my external counter and WWV had been right on.) I transmitted first maybe 2 minutes after turning the rig on. So I dialed up about 40 Hz (.04 kHz) to get on frequency. In the next 15 minutes, I had to move the indicated frequency down slowly to the exact net freq. Drift was the obviously the problem. Since then, I've turned the K2 on early and found that by net time, it was on the exact frequency on the LCD. However, just after turning it on (room temp constand at about 68F), tuning WWV on 10 MHz (equalizing the stations's audio tone on USB and LSB) shows I'm low by 40-50 Hz, drifting up to indicated freq. in 15-20 minutes. I know that resistors RA and RD on the thermister board control drift rate, and some months ago there were comments here on how to compensate, but I didn't retain the thread. Anybody care to provide that advice again or new comments? 2. I'm currently building a KPA100 internal amplifier kit, and I'm wondering if the added heat creates drift or frequency calibration problems. Dave Martin _______________________________________________ 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
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