Martin,
I have to ask since you did not mention it -- did you install the PA
jumper block after removing the KPA3? If not, you need to do that.
As for operating the transistors in the Low Power PA getting warm - one
should *never* operate the K3 in transmit with that bottom cover
removed. The cover serves as a heat sink. Hopefully you have not
already destroyed those transistors.
73,
Don W3FPR
On 5/12/2014 5:53 PM, Martin wrote:
Elecrafters,
a little while ago i had an issue with loss of rf-power.
I thought i had found the problem. I hadn't.
Symptom now:
Power out only about 3 Watts.
I removed the 100W-PA, changed the Menue to 'not inst'.
With TUN PWR set to 12W i can achieve about 2.5W .
Only 1 of the 3 Transistors on the low-Power PA gets warm during
(short) transmissions with the bottom cover removed.
There are 2 RD15HVF1 and 1 RD06HHF1. How can i check if a transistor
is defective?
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