I have the K3s feeding JUMA PA1000 with 8...10W.
It is all OK here, we do not have the 15dB rule.
Using IPA is to prevent 100W PA additional distorsion.
Old QST Review gave only 25 dB for IPA 3rd order IMD.
What might be IMD in present-day K3s IPA ?
Any measures available?
Benny OH9NB
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