After following the reflector posts for awhile, I should like
comments on the following:
1. The common practice of bringing together the input and
output of an amplifier together to a single TR relay.
Is there enough stray coupling to adversly affect amp
stability?
2. The effect of a non-synchronized TR relay. Many exciters
deliver RF output before the old style clapper relay closes.
Having this relay close with drive applied, coupled with
contact bounce, I think could induce all kinds of bad
behavior.
Many years ago, I watched the input and output of my L-7 on a
dual trace scope as I keyed the TS-940. It was not a pretty sight.
I installed a version of Rich's QSK and the amp has been
unconditionally stable ever since. In the meantime, I've had
a parade of unmodified TL-922's come through with various blown
components.
73, Roger
--
FAQ on WWW: http://www.contesting.com/ampsfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|