[Elecraft] K3 strange overshoot

[Petr Ourednik]

Hi folks,

so sorry to bother you over here.
I realized strange behavior of my trusty K3 (#778 fully upgraded, loaded, latest synths installed)
When I tried to exciting KPA500 amp I suffered with strange overshoots during first dots.

Symptoms:
- up to 12W from K3 all is ok, over 13W the full scale deflection on KPA500 appears on first dots
- after 1-2 dots power drops back to expected power based on exciting power level
- the overshoot appears again after band changing or switching between OPER/STBY
- 160m-30m are heavily affected, 20m-10m behaves better and it can be driven up to 18W but overshoot appears too (just slightly to about 600W on LED scale)

Conditions:
I realized that behavior into antennas with SWR all below 1:1.4 > no SWR protection activated at all.
The same issue appears into dummy load.

I will be happy for any kind of ideas or hints where to start...:(
Many thanks in advance.

73 - Petr, OK1RP
"Apple & Elecraft freak"
B:http://ok1rp.blogspot.com
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