[K3] [Elecraft] f/w 2.73/1.98 power calibration

[Julian, G4ILO]

Richard Ferch wrote:
> 
> It's more than just the power calibration. Even after calibrating power
> and
> setting the requested power below 50W, with either 2.73/1.98 or 2.72/1.98
> the power output on PSK31 (in DATA A) mode often exceeds the requested
> power, which results in splatter. I have been having to constantly ride
> the
> LINE IN and/or sound card output level controls in this weekend's PSK
> contest to keep the power below 50W and PSK signal quality acceptable; I
> have now switched back to 2.67/1.96 for the remainder of the contest.
> 
I don't think it is anything to do with this revision. I first noticed this
a few months ago, after one of the updates that made some changes to the
ALC. Adjusting TXG VCE may be the answer, but the other change I made was to
avoid tuning at 5.0 or 50W. The K3 recalibrates the power when you press
TUNE at those exact power levels, and if it is looking into a mismatched (or
varying, as you adjust the ATU) load then it mucks up the calibration.

-----
Julian, G4ILO. K2 #392  K3 #222.
http://www.g4ilo.com/ G4ILO's Shack   http://www.ham-directory.com/ Ham
Directory    http://www.g4ilo.com/kcomm.html KComm for Elecraft K2 and K3 
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