FWIW: I use my K3/KAT3 at 100 W in RTTY contests with no issues.? %
derating could be a function of the complex impedance at the end of your
transmission line ... my match on all bands is not terrible.
Be aware that the KAT3 has a IF trap (C10/L10) which may
catastrophically fail depending on the frequency, power and antenna
impedance.
Recourse is to remove them (i.e. bypass) as the K3 doesn't need the trap
and it is causing issues. On the KAT3A the trap is eliminated.
Since you're planning higher duty cycles, you're more likely to run into
this. Google "KAT3 C10 failure" for details.
Geert Jan
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