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Some channels not available in HD on Eastern Arc?

All the standard channels are on 51.5/72. 77 has foreign channels. If you go to "The List" at the top of this page, you can see what is on each sat.
 

The 1000.2 EA twin is just 61.5 & 72.7.
 
there used to be a "test" discovery HD channel on the west that never made it to the east (channel was labeled test)