Hardware AGC pumping. Full RF gain and no attenuation invites it. A good
post filter audio AGC to compensate should have cured it but that
concept doesn't seem to have reached the DSP receiver.
The same thing happens in a conventional receiver with audio filtering
after the AGC detector.
73, Jerry, K0CQ
On 11/10/2010 4:10 PM, David Feldman wrote:
Recently used an Orion II (on CW), receiving on bands crowded with
many very strong CW signals (and a fairly large antenna). I noticed
sometimes a condition where the receiver seemed to momentarily lose
sensitivity (when listening to a rather weak intended signal) at the
symbol rate of a stronger signal just outside the DSP passband, as if
whenever the strong out-of-passband signal was present, in-passband
gain would decrease. This was significant enough to affect my ability
to read CW from the intended (weak) station. Is there a name for this
artifact? Can it be controlled by proper adjustment of the receiver
(I was using the receiver at full RF gain, no attenuation, no preamp
enabled.) Sorry if this has been discussed before (or discussed to
death) as I don't read the reflector digest regularly.
Thanks,
Dave
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