Re: [amsat-bb] LEO's and their ilk

[Doug Braun NA1DB <na1db@xxxxxxxxx>]

But if you were pointing your transmitter at a Geostationary satellite,
almost all LEO satellites would pass through its beam anyway!

Does your transmitter have a megawatt or so of actual power output?
If not, I would not worry!  Make your co-worker do some link calculations!

But if he really meant "interfere with" instead of "damage", he
could be sort of right. But my first point above still applies.

Doug
NA1DB


 > 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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