[Elecraft] K3 Beta firmware rev. 2.82

[Julian, G4ILO]

Joe Planisky wrote:
> 
> 
> To test this, I used an audio signal generator to input single tones  
> of various frequencies into my K3 in both LSB and DATA-A modes.  I set  
> the power control for 30W.  Here are my measurements:
> 
> AF input freq. Po-DATA-A    Po-LSB
> TUNE            25.7         25.2
>   200             4.6          6.1
>   400            27.0         24.8
>   600            34.5         24.8
>   800            45.6         24.8
> 1000            53.1         24.8
> 1200            47.5         24.8
> 1400            37.8         24.8
> 1600            32.3         24.8
> 1800            30.9         24.8
> 2000            31.9         24.8
> 2200            34.3         24.8
> 2400            37.9         24.8
> 2600            34.9         24.8
> 2800            13.9         24.8
> 3000             nil          nil
> 
> So, neglecting the ~25 W vs 30 W error, it's clear that something is  
> keeping a tight rein on things in LSB, but is not doing so in DATA-A.   
> Presumably, this is the ALC action, which we are told is minimized in  
> DATA-A mode.  The data also seem to corroborate your statement that  
> the calibration point is 300 Hz from the filter corner.
> 
> 

That amount of variability is alarming. I'm really not happy with it. But to
me, that's not a 25W vs 30W error, it's a 30W vs 53W error. Because the
output at 1KHz, which is the center frequency I use for PSK31, is 53W when
30W is requested. This is exactly what I am complaining about.

If the power output at 1KHz matched the power level requested then I would
be a lot happier, though it is quite disappointing to see that the power
would be little more than half that level over most of the range that a
Digipan user would operate in.

-----
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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