3rd time!

[Elecraft mailing list]

Ed,

The PA temperature has not been properly calibrated.

Check the menu entry for CAL TPA.  Turn the K2 off and let it acclimate
to the ambient temperature, then set the value for CAL TPA to the room
temperature in degC.
If you do not have a thermometer that reads in degC, convert from
Fahrenheit by subtracting 32, then multiply by 5 then divide by 9.

73,
Don W3FPR


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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[AC6SL]

...
> 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?
...

As discussed in this old email thread, CAL TPA would be overwritten in
my K2 after trying to TUNE on the wrong antenna:
http://elecraft.365791.n2.nabble.com/PA-gone-crazy-next-episode-and-solution-td367668.html

-John AC6SL
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[Don Wilhelm-4]

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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