Hi Ross;
This looks exactly like the problem that I just recently experienced on #732. It turns out that one of the output FETS (Q5) in my LPA developed a gate to source short. Check the gate to ground resistance on each device which should be 1K-4K ohms. You should contact gary @ elecraft on instructions for a recent modification of the LPA to help with this issue.
I replaced Q5 and everything is almost back to normal but now I am working through another issue at this time.
Russ,
N3CO
________________________________
From: Ross Primrose N4RP <
[hidden email]>
To: Elecraft Reflector <
[hidden email]>
Sent: Sunday, March 13, 2011 9:33 AM
Subject: [Elecraft] K3/10 low power output, fails TX calibration?
My K3 #5143 has suddenly developed a low power output problem. Even with
tune power set to 7W, it can only generate 3.5W or so on all bands
except 40 & 80, where it can still produce 7W. Running the TX
calibration in the K3 utility generates a failure when it starts as it
can only do 3.7W on 160.
Ideas?
--
FCC Section 97.313(a) “At all times, an amateur station must use the minimum transmitter power necessary to carry out the desired communications.”
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