[TenTec] Need help understanding Orion II receive artifact

[Dr. Gerald N. Johnson]

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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