Joe, I believe the manual states that you can expect the noise level to
increase a bit in some circumstances when the NR circuit is engaged
because the Threshold is lowered--the signal to noise level increases
though. What I've found is that when I turn on NR, you can no longer
effectively adjust the threshold level in the Rx menu. I may have the
AGC set to Program adn Threshold at 20uv but when engaging the NR, I
can turn the multi knob and the Threshold level numbers change but
there is no change in the noise level, even at 191uv. So, it appears
to me that the NR circuit makes a Threshold adjustment and then locks
out the user from adjusting while NR is engaged.
I have a strange interaction between the NR circuit and Sweep. If I
turn off my rig with the Sweep engaged and then turn the rig back on,
the Sweep will freeze every time I turn the NR off. I have to have the
NR circuit engaged if I want to use Sweep . If I turn Sweep off and
then turn the rig off and then on, the Sweep and NR both work and
independently of the others' setting.
Absolutely a great rig though. I played around in the CW contest in a
bit of search and pounce for new ones, and I was continually amazed how
close I could hear a station next to a s9+30db signal. If I turned my
hardware NB off, I often couldn't even tell a pile up was nearby without
looking at the Sweep display.
Gary
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