[Elecraft] Power too high in PSK31 / SSB

Julian, G4ILO julian.g4ilo at gmail.com
Sat Oct 4 10:38:49 EDT 2008




Joe Subich, W4TV-3 wrote:
> 
> Have you set a value for CONFIG:TXG VCE because you voice peaks 
> were not coming up to the CW level?  Adding a dB or two there 
> will cause PSK peak powers to run higher than the CW value. 
>  
Good call. Than you. Yes, there was 2.0dB set in there. I'm not sure how it
got there, because I don't have any peak reading meter so I would not have
been able to tell if the voice peaks were lacking anyway. In fact, the power
out on a pure tone is about 10% higher than on key down, even with TXG VCE
re-set to 0.0db.

What I don't understand is how I appeared to fix the problem by running the
TX gain calibration on each band into a dummy load again.

I would have assumed that if you set a particular power level, you would get
no more than that amount of peak power out, regardless of any other setting.
No wonder folks driving linears are complaining that they can't accurately
set the output so they can't overdrive them. It seems to me that how much
power the K3 puts out depends on what mood it's in. :)

-----
Julian, G4ILO. K2 #392  K3 #222.
http://www.g4ilo.com/ G4ILO's Shack   http://www.ham-directory.com/ Ham
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