[Elecraft] K3 Problem during transmission on SSB

[Luigi Casari]

Ragards to all,
I have just discovered a problem, 28 MHz or 21 MHz SSB, during transmission 
the power drop down to abt. 10/15W.

This after few second of transmission, the power staies low for some seconds 
and then increases again. No question of microphone, I have tried with MC85 
and Pro set, also change the levels of the mic gain and compressor without 
result.

I have tried on other frequencies and have not been able to recreate the 
problem, only in 21 and 28 MHz.
Don't believe is a problem of SWR and some protection what limits the power, 
the antenna is the same from the 10m to the 40m, Opti Beam, and the SWR 
where have done the tests are low. Also the internal SWR meter of the K3 
give me low SWR.
Even in 160m, 80m or 6m with others antennas no problem.

In FM mode I don't notice any decrease of power, 110W constant.

Some idea?

73, Luigi HB9CXZ

hb9cxz at ticino.com
http://web.ticino.com/hb9cxz/