Then how come he could not hear that signal on his other receivers? Logic.
Steve
N4LQ
----- Original Message -----
From: "Bob's Mail" <rjanney@optonline.net>
To: "Duane Grotophorst" <n9dg@yahoo.com>; "Mark Erbaugh"
<mark@microenh.com>; "Tentec (E-mail)" <tentec@contesting.com>
Sent: Saturday, December 14, 2002 10:52 PM
Subject: Re: [TenTec] Spurious Signal on Pegasus
> I think this is a result of 2 AM broadcast stations mixing (intermod) with
> the resultant spur ending up on 1.818. I dealt with a very similar peoblem
a
> few years ago from an errant ham who accused me and our station of causing
> the interference. He even called the FCC and reported our station as the
> culprit, even though I knew we were not at fault. I did the math and
figured
> out who was causing the problem but by that time the FCC had been notified
> and made the measurements and called me to acknowledge that we were not at
> fault. The ham who reported me called back a week later and said he had
> wanted to let me know that he figured out we were not the problem. (tried
to
> make up for his shoot from the him diagnosis) Just for anyones info he
(Tom)
> is a regular on the 160 meter Top Band Reflector. He was very lucky he was
> not litigated against by our corperation ( that was considered) but never
> called back to admit error.
> ----- Original Message -----
> From: "Duane Grotophorst" <n9dg@yahoo.com>
> To: "Mark Erbaugh" <mark@microenh.com>; "Tentec (E-mail)"
> <tentec@contesting.com>
> Sent: Saturday, December 14, 2002 1:00 AM
> Subject: Re: [TenTec] Spurious Signal on Pegasus
>
>
> > Mark,
> >
> > What I think you are seeing is an image response of
> > the 12KHz (nominal) 3rd IF. As you may recall there is
> > a 467KHz LO3 signal being mixed with the 455KHz 2nd IF
> > signal to arrive at the final 12KHz (+/- 1250Hz) 3rd
> > IF.
> >
> > I think you would have also found another at 1.8125 if
> > that frequency was otherwise quiet. If you can inject
> > a locally generated strong signal into the RX does the
> > offset of these "images" vary between 5.375 and 6.625
> > KHz away by chance depending on the actual frequency
> > of the main (desired) signal? If so then I would
> > believe that there is also an interaction between
> > LO1's 2.5Khz tuning step size and LO4 - which is
> > mathematically manipulated (tuned) inside the DSP
> > algorithms.
> >
> > 73,
> > Duane
> > N9DG
> >
> > --- Mark Erbaugh <mark@microenh.com> wrote:
> > > Tonight, I was tuning around 160 with my Pegasus. I
> > > heard W1AW very loud, clear and steady on 1.818, but
> > > I also heard them with a weak a fluttery (I could
> > > see the audio frequency wavering on my waterfall
> > > display) at 1.8235. I tried to copy them with
> > > another radio, but no luck, so I am assuming that
> > > this was a spur inside the Pegasus. Any idea what
> > > causes it?
> > >
> > > 73,
> > > Mark
> > >
> >
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