Art wrote:
> My interest is in extremely weak non line of sight troposcatter
> communications (also known as over the horizon communications by the
> military). For this, photomultiplier tubes, big light collectors and
> optical passband filters are required and the rates are 1 to 3 bits per
> hour using .001 Hz bandwidth receivers (DSP soundcard/PC with good
> software). Others in the group do high speed digital modes, still others do
> carrier modulated studio quality audio transmissions.


Anyone doing EME (earth moon earth) with light? Presumably
a sufficiently narrow band optical filter and collimation would
do the trick.

Per HOUR seems rather pointless though. Almost as bad a
submarine communications using ULF radio.

Speaking of submarines, do they not now use laser communications
from satellites to ultrasensitive optical detectors?

R

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