[TenTec] Need help understanding Orion II receive artifact

[pfizenmayer]

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 at yahoo.com>
To: <tentec at 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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