Auteur wrote:
...

With steady internal carrier supplied by the receiver when in ECSS
mode, the problem goes away ENTIRELY. Then, under the worst
fades/boosts of carrier, the volume may indeed occasionally change
but it does not severely jerk and nearly squelch on the first few
tens of milliseconds of a sudden carrier level peak. So, I use ECSS
mode most of the time, though this necessitates pretty critical
adjustment of the frequency offset to avoid pitch shift, and often a
careful setting of the IF passband tuning to maximize clarity by
moving around the very distinctive region of frequency/phase ringing
at the sharp filter cutoff.
...

FWIW, with extremely careful operation, the R75 is an extraordinary
DX machine. But obtaining its full potential of performance requires
diligence.

Yours,
AUTEUR

Great post Auteur. I had noticed that nearly all R75 users seem to prefer
the manual ECSS mode to AM and I assumed it was due to the nearly
non-functional sync detector and the poor AM audio. You may have hit on the
real reason. I do not know if the KIWA mods really help the AGC issues and
I would not trust any response unless it came from Kiwa and someone with
your technical background.

I do not own the R75 as I have been put off by the need for all the mods and
optional filter costs BUT it does have a very nice price point.

--
Brian Denley
http://home.comcast.net/~b.denley/index.html