[Elecraft] [K3] Power variations in K3 / 3.19

[Björn Mohr]

On 9 jul 2009, at 16.02, Ignacy wrote:

> There is an old problem still present on 3.19. AFter turning the rig  
> on, in
> SSB the peak power starts at 30-70W and in a minute of transmitting  
> rises to
> about 95W (when set to 110W). Measurements with LP-100 calibrated in
> factory.  The initial power varies from time to time.
>
> Any ideas?

This problem has been around for some time with my K3. What happens  
for me is that when I set the power to specific level and push TUNE  
the radio stabilizes at that preset level. Then when keying and begin  
talking the power level is a lot lower that verified with TUNE. After  
a few seconds the power peaks are in the vicinity of the preset level,  
but sometimes peaks are reaching above the preset level which makes me  
reluctant to mess with TXG VCE. Another observation is that this  
problem is only with the PA in line, taking power below 12 watts seems  
to eliminate the issue.

Earlier the problem was reversed as power overshot the set level in  
SSB, now I am less worried but seeing the issue solved would provide  
some comfort when using the amp.

I am also using a factory calibrated LP-100A to verify my measurements.


73 de Björn,
SM0MDG
SE0X