[TenTec] IF gain pot
Sat, 5 Oct 2002 19:58:44 -0700
Is there a gain pot in the Jupiter? Mine seems a bit dead on ten meters.
----- Original Message -----
From: "Duane Grotophorst" <firstname.lastname@example.org>
To: "Jim FitzSimons" <email@example.com>; <firstname.lastname@example.org>
Sent: Saturday, October 05, 2002 4:12 PM
Subject: Re: [TenTec] IF gain pot
> Keep in mind that by tweaking the IF gain upward you
> will most likely be degrading the overall dynamic
> range of the Pegasus some. So I wouldn't just crank it
> up Willie-nilly, if you do so - just be prepared for
> the potential of some negative side effects.
> I have noticed that the "from factory" setting is
> always just slightly beyond the "knee" of where the
> background noise just drops off. Which also appears to
> be the same point where the AGC action of the DSP
> circuitry is wide open (full gain). When you advanced
> it for more background noise (higher IF gain) the
> DSP's AGC is having to work whether there is a signal
> present or not.
> I have also found that advancing it ever so slightly I
> can make the extremely low level spur (now very low
> with firmware 1.19) all but disappear completely. I
> believe this is due to the AGC action of the DSP
> hardware/firmware kicking in. This is consistent with
> my observation that those low-level spurs would always
> immediately disappear as soon as there was any signal
> (or band noise) in the passband.
> --- Jim FitzSimons <email@example.com> wrote:
> > There is a gain pot inside the Pegasus. Carl N4PY
> > told me about it.
> > The pot is on RF PC board. I set to maximum.
> > Jim W7ANF
> > ----- Original Message -----
> > From: "Gary Hoffman" <firstname.lastname@example.org>
> > To: "Jim FitzSimons" <email@example.com>;
> > <firstname.lastname@example.org>
> > Sent: Saturday, October 05, 2002 12:47 PM
> > Subject: Re: [TenTec] Have you Noticed
> > > I also have a Pegasus. While 10m isn't the band I
> > usually use, I have
> > tried
> > > it on 10m of course. I have no problem getting
> > weak signals. Like
> > others,
> > > I found that my computer was the main source of
> > noise in all of my
> > > receivers. I have extensive grounding, shielding,
> > and endless chokes in
> > > place to correct this. Once that was done, no
> > problems. I'd be thinking
> > in
> > > terms of something being broken, or external
> > noise, as the more likely
> > > source of all these extraneous noises.
> > >
> > > Also, Jim, how do you Turn Up the IF gain on a
> > Pegasus ??
> > >
> > > Thanks.
> > >
> > > 73 de Gary, AA2IZ
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