[TenTec] Omni-C vs. '930; hisssssss

[Michael O. Hyder]

Me too (AF filter in position 1).  I always thought my Omni-C was almost
silent, but dragged it out to see yesterday.  There is a marked difference
between not using any audio filtering (position 0) and using position 1.
Only time it's not on position 1 is when it's on position 2 (narrowest).

Mike N4NT@wireco.net

----- Original Message -----
From: "Steve Ellington N4LQ" <n4lq@iglou.com>
To: <tentec@contesting.com>; "Al Gulseth" <agulseth@juno.com>
Sent: Thursday, February 03, 2000 10:42 PM
Subject: Re: [TenTec] Omni-C vs. '930; hisssssss


>
> The noise comes from the RF chain, not the AF. You can prove this by
> simply turning down your RF gain and observing that most of it goes
> away. Having a higher quality audio stage would accomplish very little
> if anything. Most of the white noise comes from the I.F. amps. It is
> not as obvioius on the average rice box as it is on the Omni C or
> Corsair due to the other noises generated tending to mask the while
> noise. It's like driving fancy car and hearing a bit of road noise
> while in a cheap car the wind and rattles tend to mask the road noise.
> The Omni C is your fancy car and you can hear every little defect
> while the TSFTDX-*!#$% is your 72 Pinto.
>
> The Omni C has the selectable audio filters within the agc loop and I
> usually leave it set for position #1 which pretty much eliminates all
> the IF noise.
>
>
>
>
> Steve N4LQ.
> > Hmmm. It just dawned on me -- is the hiss from the RF/IF chain, or
> is the
> > real culprit the AF output IC or preamp, etc.? If the noise were
> being
> > generated before the AF gain control increasing the AF gain setting
> > wouldn't affect it; but increasing the AF gain control setting would
> > improve signal-to-noise ratio in anything AFTER the AF gain control
> if I
> > am thinking right.
>
>
>
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