Thanks Don,

I did restore R98 to its original 270 ohms (from 1k0) and power output on
10m SSB is back to a full 100W+

The ALC dithering is noticeable, but I'm not going to fiddle any more. 
Might see if i can just live with it and if not, I'll experiment some more
to find a lower value of R98 that damps the loop without reducing my SSB
power output too much. I'm not driving an amp with my K2, so it's really not
of much practical importance to me - it just jars with my obsessive
personality :)

What surprised me is that I could still get 90+ W out in TUNE and CW on 10m
with the 1k0 resistor at R98 - only power on SSB was reduced significantly
(to 30W PEP).  In the Elecraft document that describes the R98 mod, they
advise checking for the 10m power reduction in TUNE mode, which I did and
then I checked it again by keying the rig in CW.  Didn't think also to also
check power out in SSB before accepting the 1k0 resistor value.  I should
have thought to do that, but didn't expect it would be reduced so
disproportionately.

73,
John
VK7JB


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