[Orion] Orion Receiver Audio Background Noise

[Gary Tuck]

Bob, as others have said, headphones make a difference.  I hear hiss 
with 8 ohm cans and don't with the 60 ohm ones I use most often.  I 
also put 47 ohm resistors in each line which helps as well.  Finally, 
if you crank the AGC Threshold setting down to minimum--.37 uv--you'll 
hear more background noise than if you set it at the default--3 uv.  If 
I use very sensitive headphones, I also can hear annoying AGC pop on 
the leading edge of strong signals.  Higher impedance phones made a big 
difference here as well.

Gary W7TEA