[Elecraft] K3 Rf gain tracking (main vs. sub)

[ab2tc]

Hi,

Have you tried to redo the calibration on the erratic subreceiver? It's now
been a long time since I did this, but I had to do mine three times before
it came out right. The 2 first times I had a dead zone like you do. It's
very important to make sure the frequency is spot on as the instructions
call for a very narrow bandwidth to be used.

AB2TC - Knut



Stan Gibbs wrote:
> 
> 
> Stan Gibbs wrote:
>> 
>> Thanks, Mike, I'll do the same measurement and see what it tells me. 
>> Erratic behavior seems most likely due to a bad pot, but, as Sherlock
>> would say, theorizing without data is a capital mistake.
>> 
> Sherlock was right; it wasn't the pot.  The behavior of the voltage on its
> wiper is exactly what you would expect: a smooth transition from 0V to
> 4.7V for the full travel of the knob from CCW to CW.
> 
> So, the question remains, what could cause the very non-linear behavior
> that I observe with the audio and S meter?
> 
> This result also renews my curiosity about whether others have observed
> any non-linearity around the 10 o'clock position of the RF gain when
> listening to a test signal like an XG1?
> 

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