Chris,
If you have both the KPA100 and the KAT100 in the system, the power
output is measured with the KPA100 wattmeter.
If the KAT100 is used on a K2/10 than the KAT100 wattmeter is used for
power output measurement.
Take both the KPA100 and KAT100 away and the base K2 uses a simple diode
detector to measure power. That detector will only be accurate when
working into a 50 ohm non-inductive load (dummy load or antenna with
some properly tuned antenna tuner.
Try to break the problem down into pieces to be certain what is
happening. First thing is to get the wattmeter in the KPA100 properly
calibrated (no KAT100 at that point),
Then work on the value of R98 to stabilize the power control loop. Once
that is accomplished, then look at the ALC action - if you still have
excessive ALC on SSB with the KPA100 in-circuit (11 watts or above),
then look to the ALC changes for the KSB2 board.
Attempting to do things in any other order may lead to erroneous
conclusions.
73,
Don W3FPR
On 12/6/2013 1:36 PM, Chris Kimball wrote:
Rob,
Thanks for your helpful comments.
My setup has a KAT-100 in it and the KAT-100 is, apparently, is the source
of the power level measurement, not the KPA-100. I've got the Elecraft
dummy load and your suggestion was great.
At this point it looks like the R98 replacement is the way to go. I'm
getting a bipolar distribution of output power under "Tune" at a power set
level of 5w, with a display of either 4.4 or 6.4 W and nothing in between.
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