Hi,
I have the same problem with my XV50 that someone on 2005 wrote this
post below. Look at his message... but nobody gave an answer.... Good
someone help me with that one ???
This morning on our local 6 meter CW sked, I was barely able to
hear guys
that are usually very strong signals. Opening up the transverter, I
discovered that I am unable to adjust the LNA Bias Adjustment(R13)
for Q3 to
the required 200 - 275 mV. It adjusts from a low of about 4 mV up
to 55 mV.
I've got 13.7 V at 12R, 3.74 V at the R12/R15 junction, and 0.650 V
on the
drain of Q3. Current coming down that leg is 55 mA based on voltage
drops
across R12 and R15. With 55mV (TP2) drop across R14, a current of
through
R14 of about 12 mA is indicated. I think this means that Q3 (or
something
else) is sinking about 43 mA (55 mA - 12 mA). (If my memory of Mr
Kirkoff's
laws are intact).
My question is: Has Q3 has bit the dust?
Thanks...
73,
Ken Wagner K3IU
===========================
Jean-François Ménard / VA2VYZ
Elecraft K2 #4130
Elecraft KX1 #999
FISTS #11896
SKCC #2245
http://web.mac.com/jf.menard
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