[Elecraft] K3 Beta firmware rev. 2.82

[Julian, G4ILO]

Steven.Zabarnick wrote:
> 
> 
> I installed the new beta last and tested the new output power control. I
> don't see any improvement in PSK31 output power using DATA A mode. I still
> get nearly twice the output power than I have dialed in by the PWR knob.
> In
> the previous firmware, the measure output power in CW modes agreed with
> the
> PWR knob setting, but now the power output in CW is 20-30% higher than the
> setting.
> 
> I will try to redo the transmitter gain calibration to see if this helps.
> 
> 
I have just got round to testing this firmware release. Before testing the
power output in DATA A mode I did a power calibration.

It seems to me that there is still something wrong with the power control in
DATA A mode. To make a comparison, I switched the input for SSB to LINE IN
so I could compare the power output when sending a pure tone in both modes.

In DATA A the gain seems to have been reduced, and I had to increase the
LINE IN setting. With PWR set to 50W and the input level set to give a
steady 4 bars, I measured 80W on my power meter. A slight improvement but
still not enough.

In SSB the power output was correctly controlled so that only 50W output was
produced.

However, after switching between SSB and DATA a few times to compare the
results, and also changing bands, I found that the output in DATA is not
consistent. Currently I am getting about 65W for 50 selected. At one point
on 20m I actually got 50W. On 30m I am actually getting 20W (yes, 20W) with
50W selected, absolutely no change to the audio input compared to the other
bands, and 4 bars of ALC showing.

Back to the drawing board?

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