[amsat-bb] AO-7 Mode A transponder question

[Paul Stoetzer]

If you tune the passband, you hear three peaks of noise - at
approximately 145.928, 938, and 958. Although some like to avoid them
due to noise, they are actually the most sensitive areas of the
transponder. 938 is very popular with low power rovers for this reason
since a low power signal at low elevation can be much louder there
than at the center of the transponder.

73,

Paul, N8HM


On Wed, Sep 11, 2019 at 3:49 PM Don KB2YSI via AMSAT-BB
<amsat-bb at amsat.org> wrote:
>
> I would think .940 would be one, that is one area I see/hear people around.
>
> On Wed, Sep 11, 2019, 13:48 Adrian Engele via AMSAT-BB <amsat-bb at amsat.org>
> wrote:
>
> >  Alan,
> > You mention documented "sweet spots"  can anybody point out where we can
> > find this information.
> > I saw something on the AMSAT-BB many years ago but never could find that
> > email again.
> >
> > 73, Adrian AA5UK
> >
> >
> >     On Wednesday, September 11, 2019, 12:18:43 PM CDT, Alan via AMSAT-BB <
> > amsat-bb at amsat.org> wrote:
> >
> >  The Mode B transponder has, due to varying noise and sensitivity, some
> > documented "sweet spots."  Mode A, while not as popular, does get some use.
> > Are there any observed equivalent frequencies?
> >
> > 73,
> >
> > Alan
> > WA4SCA
> >
> > -----------------------------------
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> _______________________________________________
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