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Detectability of Extraterrestrial Technological Activities


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Author Topic: Detectability of Extraterrestrial Technological Activities  (Read 698 times)
Jennifer Murdoch
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« Reply #15 on: February 04, 2010, 01:23:14 pm »

       Basically, the higher  gain  available   from  antennas  at  shorter
       wavelengths (up to 10exp14 Hz) compensates for the higher quantum
       noise in the   receiver   and  wider  noise  bandwidth   at   higher
       frequencies.

       One concludes that  for  the  same  transmitter  powers and directed
       transmission which takes advantage of the high gain, the detectable
       signal-to-noise ratio is comparable at 10 micro-m and 21 cm.  Since
       non-thermal carbon dioxide (CO2) emissions have been detected in the
       atmospheres of both Venus and Mars (Demming and Mumma, 1983), Rather
       (1991) suggested the possibility that an advanced society could
       construct transmitters of enormous  power  by orbiting large mirrors
       to create a high-gain maser from the natural amplification  provided
       by the inverted atmospheric lines.
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