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Re: LEO's and their ilk



Hi John,
    I don't know of any LEO's that would be receiving in the 14.0 to 14.5
GHz. range. I did a quick search through the "non-geostationary satellites"
section of the World Satellite Directory (OK, so it's a 1998 edition) and
couldn't find any there either. From that far north, you might have been
better off pointing the antenna straight up! In any event, I don't think you
will be getting a bill from a LEO operator for destroying their satellite
any time soon......

But I could be wrong......

Howie
AB2S

----- Original Message -----
From: "John / NS1Z" <ns1z@arrl.net>
To: <amsat-bb@AMSAT.Org>
Sent: Wednesday, January 31, 2001 6:10 AM
Subject: [amsat-bb] LEO's and their ilk


> Sorry this if off (offensive language) topic but an issue came up at work
> the other day that made me wonder.
>
> We installed some MCL Ku transmitters and, because of their performance
> history, decided to burn them in before putting traffic on them. One
> transmitter is in the dummy load and the other is radiating on the antenna
> (7 meter).
>
> I dropped the dish to about 7.5 degrees el and 90 degrees az. This points
> the dish away from the GEO sats but what about the LEOs? I guess that they
> are generally all in the 7-800 mile elevation range?
>
> My question: one of my co-workers was adamant that radiating at this angle
> would cause damage to any LEO out there in the path. My thinking is that
> they use directive antennas and would be pointing towards the earth. The
> coverage would be small due to elevation, unlike the GEOs who cover about
> 1/3 the globe at a time (potentially). Even they are running mostly spot
or
> hemi beams now to allow spectrum re-use. I think the possibility of
> interference is extemely remote.
>
> Additionaly, do they use Ku band or C or ?????? Because I am so stubborn I
> am looking for facts to either support true wisdom (myself, of course) or
> otherwise.
>
> Anyone have ideas?
>
> John Wilcox  NS1Z
> 871 Route 120
> Rumford, ME  04276-3836
> PH: 207-364-2246
> FX: 207-364-2505
>
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