[HCARC] Geostationary Ham Satellite

Mon Feb 18 12:53:14 EST 2019

You really need to stop relying on ham sites for real information.

Es'hail 2 was launched by SpaceX on a Falcon 9 from Kennedy Space 
Center.  The satellite was built by Mitsubishi Electric for Qatar 
Satellite Company.  It carries Ka and Ku transponders and covers the 
Middle East and North Africa.

The commercial satellite bands are an interference limited environment.  
Multiple transponders are operating on the same frequency in essentially 
the same location.  They are separated by one of two orthogonal 
polarizations and by spot beams covering different areas of the earth.  
I don't know about the antenna the ham transponder is using but the 
commercial transponders will not provide coverage in Europe.

On 2/18/2019 8:15 AM, Gary Johnson wrote:
> I assume then that the satellite can be hit by the British and Europe as well as Africa, or they have done the Africans a great service.  There is never too much information.  I passed this on because I know Hams have been anxiously awaiting geo-stationary sats for a long time.  I make little enough use of our earth bound repeater and have no equipment to hit a satellite although one that stays in place makes it far easier.
>
> I also try to put information on the Reflector in order to stimulate its use.  That more club members (especially newer people) don’t use it is so sad.   They should trust me when I say that if you ask a question on the Reflector, you will likely end up with too much info vs too little being provided.   However you can always ask the Don’s, Dale’s and Kerry’s of the world to add a Gary J “simplified answer” at the end of the tech dissertation.  One of the main things getting my Extra Ticket taught me was how little I really know, but like my college degrees taught, is where to go to find the answer needed and enough knowledge to be able to ask a question.
>
> 73,
>
> Gary J
> NA3VY
>
> From: w4wj at aol.com
> Sent: Sunday, February 17, 2019 7:17 PM
> To: n5baa at hctc.net ; hcarc at mailman.qth.net
> Subject: Re: [HCARC] Geostationary Ham Satellite
>
> Gary...
>
> The URL referenced is a UK site, so I will assume
> that this is a British built satellite.  Oh, I see that
> AMSAT-DL (Germany_ provided the technical lead.
> So, many hands involved in getting this thing on
> the road!
>
> Let me correct that.  The Oscar 100 "satellite"
> is a "unit" that occupies space on a commercial
> broadcast satellite.  It is a "passenger" in all
> respects.  So, it is not a "satellite" per se...
> it is a "repeater" sharing space on a "tower"
> that is in a geostationary orbit.  ;-)
>
> 25.9 degrees East, puts the satellite in a stationary
> position approx 22,236 miles above the equator over
> the North central part of the Democratic Republic of the Congo.  If you look at a map...  The city of Kisangani,
> is located about 0.5 degrees North of the equator and
> at 25.19 degrees East of the prime meridian.
>
> If you looked at the referenced URL, the "bullseye"
> on the map is the orbital position of the satellite.
> By international regulations, that satellite must
> be kept "on station" within a box 50 miles on a side.
> This is to avoid any chance of a collision with another
> satellite.
>
>
> So, a ham in Kisangani, would point his antenna, for this
> geostationary amateur satellite, STRAIGHT UP!!!
>
> Because the earth is not a perfect sphere, all satellites
> "wander" and must be kept under control from their
> ground station.  The ground station not only monitors
> the "health" of all the on board systems, but also keeps
> track of the satellite position...  allowing it to "drift"
> from the 25.9 degrees East Longitude and 0 degrees
> Latitude, but not beyond the assigned box limits.
>
> Position adjustments are made by "thrusters"on the
> satellite.  The thrusters can emit ions to adjust satellite
> motion to bring it back to the nominal 25.9 by 0 home
> plate.
>
>
> The satellite was launched from Europe's Spaceport
> in French Guiana, South America. The 25.9 East
> orbital position had been pre-assigned.
>
> I hope this is not TMI Gary!!!
>
> 73
> Don
> W4WJ
>
>
>
>
>
>
>
>
>   
>
>
> In a message dated 2/17/2019 4:59:29 PM Central Standard Time, n5baa at hctc.net writes:
>
>    Who launched it or did it goes astray??
>
>    73,
>
>    Gary J
>    NA3VY
>
>    From: w4wj at aol.com
>    Sent: Sunday, February 17, 2019 2:00 PM
>    To: n5baa at hctc.net ; hcarc at mailman.qth.net
>    Subject: Re: [HCARC] Geostationary Ham Satellite
>
>    Unfortunately not visible here.  Way below our horizon.
>
>
>    73
>    Don
>    W4WJ
>
>
>    In a message dated 2/17/2019 9:46:22 AM Central Standard Time, n5baa at hctc.net writes:
>
>      The first geostationary amateur radio transponder OSCAR-100 (P4-A) is on the air.
>
>
>
>
>      The OSCAR-100 Narrowband WebSDR  https://eshail.batc.org.uk/nb/   enables you to listen to the OSCAR-100 Narrow band transponder onboard the Es'hail-2 satellite.
>
>
>
>      The satellite is in geostationary orbit at 25.9° E.
>
>
>      73,
>
>      Gary J
>      NA3VY
>
>
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