In sci.engr.television.advanced Max Power <mikehack@u.washington.edu> wrote:

| I stumbled by this dirt by accident.
| It has not been tried with DVB-T nor ATSC...
| 
| ============================
| http://en.wikipedia.org/wiki/TV/FM_DX
| 
| Earth-Moon-Earth (EME) propagation (Moonbounce)

[...]

| Because of the low signal-to-noise ratio, as with amateur radio practice, 
| EME signals can generally only be detected using narrow-band receiving 
| systems. This means that the only aspect of the TV signal that could be 
| detected is the field scan modulation (AM vision carrier). FM broadcast 
| signals also feature wide frequency modulation, hence EME reception is 
| generally not possible. Indeed, there are no published records of VHF/UHF 
| EME amateur radio contacts using frequency modulation.

This could potentially be done with the 8VSB pilot carrier.  But it is lower
in power for the same coverage area than it's equivalent analog VSB, so it
will be harder to do, but probably not as hard as with FM.

I still don't have specs on DVB-T that would tell me what, if anything,
in the signal could be used to detect it under such weak conditions.


| While not yet confirmed, the 305-metre Arecibo radio telescope may be 
| capable of receiving weak viewable EME television pictures. Based on 
| mathematical calculations assuming 60 dB antenna gain, FM broadcast EME 
| reception may also be possible using the Arecibo dish antenna.

Given it's narrow viewing angles, this does limit the range of earth
stations it could pick up this way.

-- 
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| Phil Howard KA9WGN       | http://linuxhomepage.com/      http://ham.org/ |
| (first name) at ipal.net | http://phil.ipal.org/   http://ka9wgn.ham.org/ |
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