[Elecraft] Digital mode power handling for KAT3

[Geert Jan de Groot]

> 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