Bill, W6WRT dezrat1242 at yahoo.com
Sat Jan 30 03:34:26 PST 2010
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ORIGINAL MESSAGE:
On Sat, 30 Jan 2010 01:04:08 -0800, "Jim Thomson" <Jim.thom at telus.net>
wrote:
>## I don't know why the ARRL has this aversion to pulse tuning a GG triode
>amp.
REPLY:
I can't speak for the ARRL but pulse tuning does not "sag" the power
supply enough. You could pulse tune first and then tune at full
carrier, but why bother? Just tune full carrier and be done with it.
73, Bill W6WRT
# say what? On ssb, the duty cycle at most is only 30-50%.## why would
you want to suck the B+ way down as low as it will go with a cxr ??## If the
HV caps are big enough, and plate xfmr big enough, you will easily see
thatthe pep out will be slightly higher while pulse tuning. Just pulse tune
it... then start talking. ## I contend, with a cxr.. you will likely get a
mis tune. .... UNLESS you increase the loading[decrease value of load cap..
more un-meshed].. till power out drops 2%. ## why cook the tube /xfmr/ant/
and everything else, if ssb is going to be used ? ## if rtty/fm is being
used, I'd still pulse tune the amp 1st... then do the final tweak with a 3-5
second cxr. Jim VE7RF
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