As it turns out, the problem with the drive starting high and "fading"
down to the programmed level in AM mode may have to do with the mic and
mic input used.
* If I use a D-104 (with the pre-amp cranked almost off) it exhibits the
issue.
* If I switch to the Heil PR-781 connected to the rear apron balanced
input the issue does *not* occur.
Does that make sense? Not to me, but I'm going to experiment with other
microphones on both inputs and see what happens. The shack is at least
three hundred feet at the closest from the antenna and the feedline is
choked in several places with a dozen or so Mix-31 beads in addition to
there being a good quality balun at the feedpoint, which is somewhere
around 60-70 feet above ground. There are no other symptoms of RF
getting into anything... The game is certainly afoot, though... My AM
group likes the sound of the D-104 and I don't like unsolved mysteries.
73,
--jim
Jim Barber, N7CXI
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