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In Europe there is a PAL system that uses only 5.0 MHz channel capacity.
NTSC-BSTC uses (technically) only 4.58 for vision, and comes in under 5.85 
MHz ignoring 'guard bands'.
ATSC digital broadcast signals should be able to survive moonbounce -- but I 
suspect that only 1-5% of the packets could be ECCed and recovered.
DVB-T promises theoretically higher ECCing rates, but I don't see more than 
7.5% of the packets being recovered.
DVB-T can fit into 5, 6 [PAL-N], 7 & 8 MHz channels -- to cope with the wide 
verities of PAL and SECAM it has been chosen to replace.
DVB-T @ 5 MHz would be preferable for EME, in 'robust mode'.
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Has anyone attempted to 'moonbounce' or EME ATSC UHF band TV signals, in 
the UHF band allocation?

I don't know of anyone who's done it with ATSC signals.
A TV DXer in Australia has DXd analog carriers via moonbounce.

http://www.geocities.com/toddemslie/moonbounce_DXTV.html
http://www.geocities.com/toddemslie/UHF-EME-TVDX.html

If the test were done in NZ, using NICAM -- it might be possible for NICAM 
data to survive the EME.
I would not expect the PAL signal to survive the trip intact, however.
Perhaps using NICAM to recover probabalistic sync intervals might work, but 
recovery of the coluour signal (due to doppler and ionsphereic distortions) 
I would classify as theoretically impossible -- unless you are using 
AIRICEBO / CANBERRA / GLADSTONE.
A detailed systems analysis is needed to verify most of my assumptions, as 
probably a few are wrong.
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What such a test could accomplish:
1. Find out if ASTC error correction can survive EME, enough that is to 
get a station ID.
2. Find out what 'emergency utility' such a communication system might 
possess.
3. As a propagation experiment.
4. As a test of a radio astronomy network.

The signals do not appear to be strong enough to even deliver sync buzz, 
let alone decodable data.  A larger antenna would help but with these wide 
signals I doubt one would reach decodability.