Ed,
The most common reason for CAL TPA to change on its own is if it is
powered when the K2 is below zero degC - the value *should* go negative,
but it instead goes to a very high number (255).
If that is not the reason, I would look carefully at the KPA100 -
possibly change Q3 and check the soldering of R5 and R6, then reset the
bias on the PA transistors.
73,
Don W3FPR
On 5/30/2014 1:13 PM, Eddy via Elecraft wrote:
Hi Don, this would be the third time I've had to re-calibrate CAL-TPA!!!!! It's
been changing on its own......maybe K100 possessed?
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