Neal,
Check Q8 against the DC voltage chart in the back of the KPA100 manual.
It would seem that Q8 is not oscillating or oscillating with a very weak
signal.
Things to check:
T3 - be certain it is wound correctly and has well tinned leads and good
soldering.
Q8 - and check R4 and R10 for proper values.
X1 - if everything else checks out, replace X1 and Q8.
73,
Don W3FPR
Neal Campbell wrote:
I am still debugging why the apparently functioning KPA100 has no
negative bias going into U4 pin 8. Here are the measurements of U4
pins as well as all of the diodes (in rx)
Any ideas?
Neal
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