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Re: NASA elements set 103



Thanks, Claudio, (and others)

I have STSPlus Version 0016 on my system.  Do I need to download an update
to get accurate tabular pass predictions?

73,
Frank

----- Original Message -----
From: Claudio Martins <ctpm@vega.net.dhis.org>
To: Thomas McDaniel <Tmcdanielsprint@earthlink.net>; Frank Grossman (WB2BXO)
<flgrossman@earthlink.net>; Shlomo <4x1as@netvision.net.il>;
<amsat-bb@AMSAT.Org>
Sent: Thursday, July 05, 2001 9:04 AM
Subject: Re: [amsat-bb] NASA elements set 103


>
>  STSPLUS always worked with any type of bird, LEO or HEO. What did _not_
work
> for HEO sats was the tabular pass prediction algoritm (it wouldn't work
with
> mean motion smaller than 1.5 if I recall correctly). With this new version
> the limit has been decreased and pass prediction now works with satellites
> like AO40.
>
>   As for accuracy, it will work well enough for hams, but it won't equal a
> program properly designed for HEO sats. That is because STSPLUS uses the
SGP4
> orbital model in its calculations. This model is more suited for LEO
orbits.
> For deep space orbits (birds like AO40's) one should use the SDP4 model
and
> not SGP4.
>
>   Anyway for our kind of activities I think it works good enough since we
> hams use relatively large beamwidth antennas, at least on AO40, so there
> shouldn't be any problems. STSPLUS is the program I use at my shack, its
one
> of my favorites for its simplicity and efficiency.
>
> regards
>
>    Claudio
>    CT3KD
>
>
> On Thursday 05 July 2001 05:58, Thomas McDaniel wrote:
> > Get the latest version of STSPLUS (0123) -- according to the info its
> > supposed to work correctly with AO-40.  It is very close to Instant
Track
> > using these Keps.
> >
> > 73  Tom  n0ntx
> >
> > ----- Original Message -----
> > From: "Frank Grossman (WB2BXO)" <flgrossman@earthlink.net>
> > To: "Shlomo" <4x1as@netvision.net.il>; <amsat-bb@AMSAT.Org>
> > Sent: Wednesday, July 04, 2001 15:45
> > Subject: Re: [amsat-bb] NASA elements set 103
> >
> > > Will this data work with STSPLUS?  I read somewhere that STSPLUS won't
> >
> > work
> >
> > > with HEO birds since it was only designed for LEOs.  Would STSPLUS
grant
> > > good enough results--a few minutes in time or a few degrees in azimuth
> > > and elevation off--for casual users or would the output be completely
> > > wrong
> >
> > and
> >
> > > unusable.
> > >
> > > Thanks and 73!
> > > Frank
> > > wb2bxo@amsat.org
> > >
> ----
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