[Elecraft] KX3 KXPA 100 KXAT Power readings.

[Johnny Matlock]

Good Evening

I bought a used KXPA 100 with tuner
that had been stored
and It seems  to have a difference between the power setting on the KX3
 and the actual output power.

When I set the Kx3 for 50 watts I get about 40 watts out into a dummy load.
It’s the same when set for 100 watts, I get about 80 watts.

I first noticed the difference because of the low reading on the KXPA 100
power display, so I connected the
to a watt meter with a dummy load.

I have ran  the the calibration routine two times, and the power output is
a little closer to the set power, but still lower.

It is similar on all bands, not just one.

I thought I was low on Voltage so I shortened the power cable to  about  2
feet and verified that it’s holding up during the key up test with a fluke
meter.

I am also watching the amp with the computer interface program, and the
input voltage is staying up in the 12.6 range or so.

The amp and the KX3 both have up to date firmware.

The SWR is running about  1.1 to 1.2 into my dummy load.

If I crank the power to 110 watts, I get about 95 watts.

I don’t see any high current conditions
and nothing appears to be getting hot.

You thoughts would be appreciated.
Thanks in advance
72
Johnny ACØBQ





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