[Elecraft] K3 - Strange problem on 10 Meter SSB with power out

[Chuck - AE4CW]

I have previously documented the SSB power drop problem to elecraft and
understand it's on Wayne's list to resolve.  I used the 2-tone test and
adjusted the 2-tone peak power to equal CW TUNE power (using an LP-100A).  I
found three things trigger the SSB power drop: 1) a power change even if you
return to the original power; 2) pressing ATU TUNE, and; 3) a band change. 
On MCU 2.20 the drop was as little as 15% on 160M and as much as 39% on 10M. 
All these tests were run at 100 watts requested from the K3.  And I am using
the 2.7 KHz 5-pole filter.

I just loaded MCU 2.23 and re-ran the tests.  The results are considerably
improved.  On 160, 80, 40 and 30M's there was no drop at all.  The worst
band was 12M (20%).  The others were 60M (9%), 20M (3%), 17M (5%), 15M
(14%), 10M (11%) and 6M (13%).  I spot checked these results with voice
input and saw the same results thought clearly not as precise and repeatable
as the 2-Tone test.

In addition the peak powers on USB and LSB were virtually identical (within
1 watt in every case).  I'm not positive if this is an accurate indication
as the 2-Tone test help text says to use LSB (not USB).

In any case this looks like a significant step forward, so we can hope for
continured improvement across all the bands.

Chuck, AE4CW



Lyle Johnson wrote:
> 
> If you experience this problem (low output on SSB), please check if the
> other 
> sideband works OK, and note if you are using the 2.7 kHz 5-pole filter or
> the 
> 8-pole 2.8 kHz filter.
> 
> Finally, please try the latest beta firmware.
> 
> 73,
> 
> Lyle KK7P/7
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