[TenTec] guide to adjusting Orion receiver; filters and performance

[Carl Moreschi]

I've tried this test many times.  I do not hear the weak signal distortion
with an AGC decay time of 20db/sec and a hang time of 0.35 and a threshold
of 0.37 uv.  These values work very well for me for ALL signals CW and SSB
signals.

Carl Moreschi N4PY
Franklinton, NC
----- Original Message -----
From: "Sinisa Hristov" <shristov at ptt.yu>
To: <tentec at contesting.com>
Sent: Tuesday, March 02, 2004 10:30 PM
Subject: Re: [TenTec] guide to adjusting Orion receiver;filters and
performance


> Carl Moreschi wrote:
>
> > I ALWAYS run my agc threshold  at 0.37 uv and RF gain full.
> > I cannot find any example of an improved signal to noise ratio
> > by either reducing RF gain or increasing AGC threshold.
>
> Maybe you didn't increase the threshold sufficiently.
> Please note that AGC THRESHOLD values are in error
> by whole 21 dB with preamp on (9 dB with preamp off).
> So, you probably didn't get the threshold level you aimed for.
>
> The effect to look for is the reduction of distortion
> caused by a weak signal and noise modulating each other
> through AGC action. This is noticeable even with the
> slowest decay setting, but, of course, vanishes with
> a long hang time, which may not be acceptable for other reasons.
>
>
> 73,
>
> Sinisa  YT1NT, VA3TTN
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