[Elecraft] Hot KXPA100 Amplifier

[Jim GM]

Durring the last month of the ARRL Centennial QSO Party I was behind on
points to get into the top tire. So I finally turned on the amp and started
calling CQ on 20 -10 Meters. I noticed the the amp was getting hot and
finally tripped out on high heat. cooling fan helped but not as well as I
hoped.

I also noticed that the amp ATU would start to re tune on my transmit
frequency more than I would like. I finally tracked down the issue and came
up with a solution.

RF was coming back on the RF output cable between the KX3 and KXPA100. Some
RF was also coming back on the other cables as well.

I installed some of those DX Engineering clamp on choke cores. I bundled
the inter-connecting cables and put 3 of those cores around those cables. I
separated the RF output cable from the bundle, and took one clamp on core
and wrapped one turn  close to the amp. Took care of my problem and the amp
ran as cold as a cumber in the frig.

COMMON MODE CHOKE POWER !!!  :-)

-- 
Jim K9TF