[Elecraft] More missing bias info (kpa100)

[Don Wilhelm]

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