[Elecraft] K3 Problem during transmission on SSB

[Scott Ellington]

Sounds like RF feedback.  Do you see the same problem with a dummy load?

73,

Scott  K9MA




Scott Ellington
Madison, Wisconsin
USA

On Oct 14, 2010, at 2:37 PM, Luigi Casari wrote:

> 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/
> 
>