Dave - that is probably the worst possible way to use an Orion - and was the
source of all sorts of issues when Orion first came out . You are right,
this was discussed at length - but has not been talked about for quite
awhile now.
Quick simple answer is run AF gain about 1/2 to 2/3 and control with RF
Gain. If you look at the Ten Tec site there are papers on optimum use of
Orion AGC for weak signals , for contesting etc . There is also some writeup
in the manual for both the 565 and the 566 .
If you cannot find the stuff - let me know off line and I will dig some out
.
73 de hank K7HP
----- Original Message -----
From: "David Feldman" <wb0gaz@yahoo.com>
To: <tentec@contesting.com>
Sent: Wednesday, November 10, 2010 3:10 PM
Subject: [TenTec] Need help understanding Orion II receive artifact
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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