[amsat-bb] AO91, AO92 and XW-2 sats with mobile whips

[Robert Bruninga]

Darn right.  When a LEO satellite is near the horizon, it is 1500 miles or
more away.  When it is above 45 degrees it is maybe half as close adn that
is 6 dB dfference.  When it is overhead it is 10 dB closer.

See: http://aprs.org/LEO-tracking.html

bob

On Sat, Jun 30, 2018 at 12:42 PM, Robert Bragg <airrj1 at gmail.com> wrote:

> Would you want higher lobes?  It seems like there is more db loss closer to
> the horizon and much less as you get overhead.  That was my first thought,
> but it is just a guess, I am interested to hear what people with more
> education and experience have to say.  Interesting topic thanks for
> bringing it up John.
>
> R.J. WY7AA
>
> On Sat, Jun 30, 2018 at 11:43 AM, John Geiger <af5cc2 at gmail.com> wrote:
>
> > Hi Dave,
> >
> > That is great to know.  Sounds like it would work.  I wonder if a 1/4
> wave
> > antenna might be better than a 5/8 wave as it might have some higher
> lobes
> > as well and cover more of the pass.  Does anyone know about this?
> >
> > 73 John AF5CC
> >
> > On Fri, Jun 29, 2018 at 8:20 PM, David Quick <
> david.quick at frontiernet.net>
> > wrote:
> >
> > > I have made numerous AO-85, 91, 92, and SO-50 contacts from my truck,
> > > mostly
> > > while stationary due to the desire to log the contacts, with a 25 year
> > old
> > > Kenwood TM-733a (~25 watts) and a dual-band antenna on the roof of the
> > > truck. Even a simple 2m quarter-wave works fine and offers a decent
> match
> > > on
> > > 435 MHz.
> > >
> > > The feature that helps the most is the radio's full duplex capability.
> > When
> > > I hear my own voice on the downlink frequency I know I'm hitting the
> > bird.
> > >
> > >
> > >
> > > -----Original Message-----
> > > From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of John
> > > Geiger
> > > Sent: Friday, June 29, 2018 3:03 PM
> > > To: AMSAT
> > > Subject: [amsat-bb] AO91, AO92 and XW-2 sats with mobile whips
> > >
> > > I am hoping to get into mobile satellite operations soon, and at times
> I
> > > will be able to operate portable with a dualband yagi antenna. . Other
> > > times, though, I will be on family trips and unable to stop for
> satellite
> > > passes, so would have to operate while in motion.  Are AO91, AO91, and
> > the
> > > XW-2 satellites able to be worked using a 1/4 wave or 5/8 wave dualband
> > > mobile whip antenna?
> > >
> > > 73 John AF5CC
> > > _______________________________________________
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> > >
> > _______________________________________________
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> _______________________________________________
> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
> are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
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