David,
You are correct that the only thing common to 20 meters and 12 meters is
the relays for the VFO Range Select.
Put the internal counter probe in TP1 and see if you have a steady
frequency on each of those bands. The low end of 20 meters should have
a VFO frequency of 18,915 kHz and at the low end of 12 meters the
frequency should be 19,975 kHz.
If the VFO frequency is correct, then relays K13, K14 and K15 are
working correctly for those bands.
Fluctuating power is usually associated with the power control loop or
RF feedback is another possibility.
Just how much does the power fluctuate? "Wildly" is not an adequate
description to provide troubleshooting information.
If you have a KPA100, does the power fluctuate if power to the KPA100 is
removed and only the base K2 is powered?
73,
Don W3FPR
David C Dawson wrote:
My K2 (05386) has developed a problem affecting the 20 meter and 12
meter bands only. When I key up, the power fluctuates wildly. On the 20
meter band rx seems normal, on 12 there is a chorus of birdies.
My assumption is that a common component was cold-soldered or has
failed.
I note that in the relay table, K13,K14 & K15 are energized together
only on those two bands.
Before I start the troubleshooting, I'd like to know what components
could be the culprits?
Or any other (helpful) suggestions. (I have an rf probe still)
Thanks.
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