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I'm not sure, but I'd guess that military communication satellites do not work by just block shifting a group of frequencies.
As a wild guess, I'd think they'd use some sort of "store-and-forward" approach where the satellite only re-transmits data packets that have been authenticated via some sort of secret key.
Now if the terrorists got ahold of the key, that would be another story!
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Fortec 90 dish, SM3D22 motor
Standard 0.4db LNBF, Twinhan 102g receiver
Kaffeine and MythTV software on a 3GHz P4 w/NVidia graphics card
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