[Elecraft] K3 and PSK

[Julian, G4ILO]

Lyle Johnson wrote:
> 
> If you really must do this, you should probably set CONFIG:TX ALC OFF 
> once you've adjusted your power level using the PWR control. Otherwise 
> the ALC system will see the Tx output not being what was requested and 
> will increase the gain, leading to power creep and all sorts of other 
> problems.  And a side effect is that when you next request power, you'll 
> get alot more than you asked for because the ALC loop now believes the 
> Tx chain gain is far less than it actually is.  The ALC 5 bar level is 
> the level to which all transmit system gains are balanced -- at least 
> those that use any sort of audio as the ultimate source.
> 
If that's how it is supposed to work, why doesn't it REDUCE the gain when it
sees the Tx output being MORE than what is requested? Because it doesn't.
That's the point.



> In the latest Beta code I tried very hard to balance levels so that 
> CONFIG:TXG VCE can be set to 0.0dB.  This might have been affecting your 
> power control issues.
> 

The trouble with this is that TXG VCE is an SSB mode adjustment. I don't
have excessive power in SSB mode therefore I don't wish to reduce the TXG
VCE. If there was a separate TXG setting for DATA as others have suggested
on previous occasions, this might be the solution. Although at present, the
minimum -3.0dB setting is not quite sufficient to get the output down to the
correct level.

<quote?
I did extensive testing with Olivia (125/8 through 2000/64) and WSPR to 
be sure the power levels are as requested and stable.  At least on my 
K3, they seem to be.


I check the power using a TUNE signal (pure sine wave). I would expect the
output power to be the same in DATA as if the same tone is transmitted in
SSB mode, and the same as when keying down in CW mode.

-----
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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