Radio SETI    updated April 6, 2016  D. Carrigan ( - subject line must be sensible)

(My SETI interest is not funded by Fermilab or the U. S. Department of Energy. This portion of the site is needed to illustrate other interconnections related to Fermilab.)
Channeling Adv. Accel. Infrared/Dyson SETI Home
Biography Bibliography Nobel Prizes

Radio signal propagation (see SETI formulas)


Some other radio SETI  sites:

SETI Institute (Allen Telescope)


Serendip (Berkeley), SETI@home

SETI League

Energy to launch an electromagnetic bit, transmit it through space, and detect it

  • Larger separation between the sender and receiver requires more energy

  • Bigger transmitting and receiving antennas lower the energy

  • Better or more sensitive detectors help. For fundamental reasons this implies cold detectors.

  • For electromagnetic signals the attenuation of the interstellar medium is important

  • Antenna gain-the ability of an antenna to focus the beam. Bigger dishes with higher gain focus better

  • For the example in the left hand column the transmitter cost of a received electromagnetic bit is 4 Joules

SETI messages

SETI message size