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

[Stan Gibbs]

In the process of investigating this further, I tripped over a very nice
diagnostic tool: the Config menu's "SW TEST" entry. This option can be set
to "SCN ADC" to allow monitoring of the 4 potentiometer inputs to the PIC
processor ADCs. This allows one to verify the range and linearity of the
pots very easily.

As expected, the ADC outputs produce a linear count ranging from 002 to 240
for the full travel of the pots (all 4 of them exhibit the same results). 
Those counts correspond to input voltages (from the pots) of 0.039V and
4.71V, respectively, which are essentially what I measured with my
voltmeter.

This method is MUCH easier, however, and eliminates any question as to what
the ADC is actually seeing on its inputs.


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73, Stan - KR7C
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