Small duty cycles in SETI

Details Small duty cycles in SETI Small duty cycles in SETI

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986inns.iafcq....g&link_type=abstract

IAF, International Astronautical Congress, 37th, Innsbruck, Austria, Oct. 4-11, 1986. 5 p.

Mathematics

Logic

Project Seti, Radio Communication, Radio Signals, Electromagnetic Noise, Radio Receivers, Signal To Noise Ratios, Thermal Pollution, Transmission Efficiency

Scientific paper

It is argued that the assumption that a SETI sender will use an onmidirectional beacon and continuous emission is unreasonable. For CETI within the 'waterhole' radio frequency range 18-21 cm, the technological limitations of Kardashev 'zero' civilizations such as ours and of the more developed Kardashev I civilizations lead consistently to the use of conventional antennas of 100-1000 cm diameter both for the sender and the receiver. This makes intermittent emission unavoidable, resulting in transmission toward each target star of interest in succession, with a small duty cycle.

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