[amsat-bb] Re: Phase 4
kl7uw at acsalaska.net
Wed Oct 31 00:57:16 PST 2007
Since most of the ham population is at mid-latitudes in the Northern
Hemisphere, coverage will not be an issue. Those of us at high
northern latitudes will find that a Geostationary satellite is low on
the horizon. Assuming the Intelsat will chose a
mid-continental sub-satellite longitude (90-100W Long), my elevation
may only be 5-7 degrees to the Phase-IV. My latitude is 60.67N and
Longitude is 151.3W. For stations even farther north there may not
be line of sight path. Barrow, AK 70N latitude see the Clark Belt at
only 7 degrees above the horizon due south.
However if an Asian Geostationary sat is not more than about 50-deg
West of me I may have access to it, as well. Southcentral Alaska is
almost exactly north of Hawaii and thus sits at mid-Pacific Longitude.
Earth station antennas will have to consider locations that provide a
low horizon in this case. The HEO's like the Phase-3 sats were all
inclined to the equator about 60-degrees so that apogee provided high
look angles for very extended time periods.
I know about this from operating a TV-Satellite dealership in the
mid-1980's installing C-Band TVRO equipment.
73, Ed - KL7UW
At 04:22 PM 10/30/2007, Robert McGwier wrote:
>We have kept Eagle satellite alive. The lab at U. Md. ES is being built
>out and we are going ahead with the structure. We helped fund the
>completion of P3E with our international partners and stepped up our
>efforts to finish the IHU-3 for them (and us.
>The Eagle satellite structure build out is funded and slated for
>completion in 2008.
>We are really going to try to get P3E a ride on Intelsat to balance
>against the other offers to see what is best for AMSAT-DL and us.
>Stefan's analysis is correct. Any one geostationary bird can cover
>roughly a third of the earth.
>Stefan Wagener wrote:
> > Yes,
> > It is a great project and deserves our full support!
> > Having said that we also need to realize, that depending on the location of
> > the satellite above the equator we might only have the Americas in the foot
> > print. No Europe or Africa and no Asia. Since the first geostationary
> > satellite with amateur radio has to provide tangible support for government
> > agencies (funding source) it will certainly be primarily centered around a
> > North American footprint. That's why we need to keep Eagle alive
> and support
> > Phase 3E.
> > All together they will give us the full package of worldwide DX via
> > satellite and reliable high power communication in the Americas.
> > 73. Stefan VE4NSA
>AMSAT Director and VP Engineering. Member: ARRL, AMSAT-DL,
>TAPR, Packrats, NJQRP, QRP ARCI, QCWA, FRC. ARRL SDR WG Chair
>"An optimist may see a light where there is none, but why
>must the pessimist always run to blow it out?" Descartes
>Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
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Ed - KL7UW
BP40IQ 50-MHz - 10-GHz www.kl7uw.com
144-EME: FT-847, mgf-1801, 4x-xpol-20, 185w
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