<< Cam Christie wrote:
 > Should we not have optical  based electronic receptors scanning
 > the skies.
 
 When I think of the benefits of using something like Direct Sequence 
 Spread Spectrum modulation over visible light frequencies, with 
 bandwidths in, say, the terahertz range, I don't see any reason why an 
 advanced civilization would be emitting much radio at all.  Worse yet,
 such a signal would look just like white light, or starlight, or any type 
 of source desired.  It would not be decipherable or even detectably 
 artificial unless the transmitting folk wanted it to be.  For that 
 matter, any number of "stars" we see could just as well be transmissions.
  >>
Is there a place I can find out more about this on the web?  Like the
potential uses of frequencies in general also, etc..?
thanks
danny