I ran the test and published the results. 2000 DB/S is exactly where it
worked best. As a matter for fact 2000 DB/S is the only place it worked.
Your statement indicates just the opposite. All I can say is "try it". Maybe
theory isn't always right or maybe QRN is different on this side of the map.
Steve
N4LQ
----- Original Message -----
From: "Sinisa Hristov" <shristov@ptt.yu>
To: <tentec@contesting.com>
Sent: Monday, May 24, 2004 8:26 AM
Subject: Re: [TenTec] Orion AGC setting for QRN
> Steve Ellington wrote:
>
> > I just built the little Elecraft signal generator and ran some test
during
> > high QRN levels. Using a coax splitter, I fed the generator and the
antenna
> > together into the Orion. The signal was very weak which was perfect for
my
> > test. I tried various combinations of fast, med and slow setting and no
> > matter what, when a burst of QRN hit, the cw carrier was totally blipped
> > out. I then went into the prog setting and cranked the decay to maximum.
> > This did wonders! No more blipped out CW! So.....For best cw recption in
> > QRN, use AGC prog mode, set decay for max. Do not even think about
adding
> > any hang time!
>
> Reception agains QRN is fundamentally different from
> reception against steady backround noise.
>
> Setting decay rate to maximum effectively clips the input signal,
> be it CW, noise or QRN. Slightly less distortion should result
> from using the slowest decay rate which still recovers from
> QRN bursts fast enough. There is no need to use 2000 dB/s
> to achive that. As you said, hang time should be zero.
>
> > Threshold level didn't seem to matter.
>
> It should be set just above background noise level,
> but if QRN exceeds that level significantly, then
> the threshold doesn't matter.
>
>
> > Interestingly, running the same test on the IC-756PROII revealed no cw
> > blipping at any agc setting.
>
> PRO's AGC seems to be clipping at all times,
> producing that "dirty noise" sound.
>
>
> 73,
>
> Sinisa YT1NT, VA3TTN
> _______________________________________________
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>
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