Don,
At first I thought your suggestion didn't affect anything since I already
had dressed the leads fairly well. However, in bypass mode (less than 10
watts) the IMD is now back to -30 dB. Also, after running for about 15
seconds, the IMD at 25 watts now drops to about -27 dB.
So there is
David,
The only other thought I have is that perhaps the KPA100 PA transistors
are not operating at exactly the right point of their characteristic
curve. The only thing that will change the portion of the curve for the
PA transistors (i.e. the operating point) is the bias. The bias setting
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