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RE: Mode-B vs Mode-J VERSUS Mode-S



> Amateur is secondary status worldwide between 1260-1300 MHz.
> Probably the space-to-earth requirement comes from the 
> Primary worldwide 
> allocation of Earth Exploration-Satellite (active) and Space Research 
> (active)  which I believe refers to imaging and other bistatic radar 
> techniques.  If this is correct, an L-band uplink would 
> potentially cause 
> harmful interference to that service (as they're trying to 
> listen for the 
> reflections).

You guys have it back to front, L band is UPLINK only (isn't AO-40 L an
uplink afterall? :) ).  And yes, I think C band is the same.

Obviously, downlinking is more likely to cause problems with other services
on the band.

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