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**Coededgeme** · 09-01-2012, 12:48 PM

My one concern is; at a 100 ly's distance, would the radio signal that is at the amplitude 1/10,000th of the amplitude at 1 ly's distance be meaningful enough to be 1) detected 2) decoded ?
What about the possiblity of a weak signal becoming indistinquishable with background noise ? Wouldn't it be like shouting into the Atlantic from Land's End and trying to pick it up with a high-end receiver at Tokyo Bay ?

Another concern is reflection. Short wave radio signals were chosen to reflect back down to earth's surface; not much escaping into outer space ?

09-01-2012, 12:48 PM	#38
Coededgeme Join Date Nov 2005 Posts 334 Senior Member	My one concern is; at a 100 ly's distance, would the radio signal that is at the amplitude 1/10,000th of the amplitude at 1 ly's distance be meaningful enough to be 1) detected 2) decoded ? What about the possiblity of a weak signal becoming indistinquishable with background noise ? Wouldn't it be like shouting into the Atlantic from Land's End and trying to pick it up with a high-end receiver at Tokyo Bay ? Another concern is reflection. Short wave radio signals were chosen to reflect back down to earth's surface; not much escaping into outer space ?
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