[Elecraft] [K2] Excessive PSK IMD with new K2/100

[dberkley]

Just built a KPA100 for my K2 S/N 6274.  When originally running PSK on the
barefoot K2 had no problem achieving IMD around -30 dB (measured with
PSKmeter).  The K2 had a KAT2 tuner which was removed, and replaced by an
external autotuner when the KPA100 was installed.

With the new KPA100 in place I can't get the IMD below about -24 dB and it
seems to be independent of power setting or actual output power (including
bypass mode at 5 watts which is where I set the original K2) and remarkably
independent of audio drive, which wasn't true with original K2.  There is a
broad minimum in the IMD when the ALC barely flickers on the 3rd bar. 
Optimal performance is on 20m but there is little difference on other bands
(when the audio is adjusted).

Any thoughts on what has changed?  Is there any obvious way to improve IMD,
although I guess > -20 dB is in the barely acceptable range?

73, David
K2MUN
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