Start checking at each part back toward where you do have 13 vdc. Suddenly,
you'll have the bad connection 'bracketed' - no 13 v on one side and 13 v
present on the other side.
You may have a badly tinned toroid lead. They can be hard to spot at times
(the lead will look soldered, but there's actually still a thin layer of
enamel between the wire and the solder in the hole.
Ron AC7AC
-----Original Message-----
From:
[hidden email]
[mailto:
[hidden email]] On Behalf Of JEAN-FRANCOIS MENARD
Sent: Friday, June 25, 2004 11:53 AM
To:
[hidden email]
Subject: [Elecraft] Output power problem
Finally I changed PA transistors Q7 & Q8, because I shorten Q7 between
Base and Collector by accident with my probe... no big deal...
Now, tuning at 2W I have again these readings:
Both Q7 & Q8
B : 0.6 VDC
C : 0.0 VDC !!! (should be around 13.3 VDC
E : 0.0 VDC
There is also the readings I have with driver Q5 when tuning at 2W
Q5
E : 0.6 VDC
B : 1.2 VDC
C : 13.4 VDC (should be 12.4, but... )
Any idea ???
===============================================
Jean-François Ménard / VA2VYZ
[hidden email]
A
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