George,
I would advocate 100 uHy rather than 50 mHy - but for 40 thru 10 meters,
50 uHy is OK.
If you really meant 50 millihenries, then yes that would be quite fine
for providing a DC path for the lower bands, but there may be strange
effects on the higher bands due to stray capacity.
73,
Do
OK Don,
I pulled one leg of D9 and saw 54K forward and infinite reverse on the DVM
(no KAT2) so I'm guessing that's ok for a Schottky diode. I just now
checked the tuner taps and the antenna was charged up pretty good. . .that's
amazing since there's hardly a breeze and it isn't below freezing ou
George,
OK, do check D9 for possible damage, or if you have the KAT2 installed,
there are wattmeter dides in that option that may have failed and could
produce the same thing as damaged diodes in the KPA100.
I am not saying the above is your problem, but I am saying, "do check" -
if you have a
Thanks Don,
I've now pulled the remains of Q7 and also removed Q8. I checked the bias
and it is at .64 volts and present at both base pads. This is a K2/10, so
does that rule out the static antenna charge theory? I have a sort of crude
transistor check which consists of connecting ohm meter - t
George,
First, you do not have to replace the entire RF transmit chain, only the
two PA output transistors (Q7 and Q8) and the 2 2NAs that control
the PA bias (Q11 and Q13). Replace Q11 and Q13 first, and then measure
the voltage on the PA transistor base solder pads during a TUNE - it
sh
After 2 weeks or so of happy operating of my newly assembled K2, Q7 exploded
with a loud snap. From what I read here, I'm going to have to replace the
whole transmit transistor kit. I did see that this failure has happened to
others, so I'd really like to hear if those who had the experience were
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