Thanks to advice from M0DHO, LA3ZA and Gary Surrency
at Elecraft the problem described in
http://www.ac6rm.net/mailarchive/html/elecraft-list/2005-12/msg00408.htmlis now solved, or nearly so. I still see a big jump
in SSB power between 10 and 11 watt settings, but the
power output is always under control (no power supply
buzzing and RF metering does not read 100 W peaks when
set for 11 W, for example). No obvious signs of
splatter or distortion any more.
I put a 1k resistor in series with the base of Q1 in
the KSB2 and put 3.3k in parallel with R9. It's
pretty fiddly work on this compact board, but doable.
This is in the middle of the range for R9 suggested by
Gary Surrency. Probably I should go for the low end
of the suggested range (even more aggressive ALC).
73,
Steve VE3SMA
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