Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980spfl...22..124l&link_type=abstract
Spaceflight, vol. 22, Mar. 1980, p. 124-127.
Astronomy and Astrophysics
Astronomy
Extraterrestrial Intelligence, Ground Stations, Project Seti, Radio Beacons, Astronomical Catalogs, Decoding, Signal Analysis, Television Transmission
Scientific paper
The implementation of Intelsat-type ground stations as CETI beacons is considered. With a beamwidth of 11 degrees, signals would be perceived by ETI as a 22 second pulse due to the rotation of the earth. However, television signals carried by Intelsat could transmit up to 750 pictures and be quite informative if a CETI signal in the form of a key to decode the television signals is first transmitted. A method of prerecording a CETI program in which signals could be automatically changed is based on using two video cassette recorders each containing one hundred and sixty periods of 22 seconds of available recording time. The proposed method could transmit more CETI information at a lower cost than conventional methods. Lists of candidate stars that should receive signals from two specific ground stations are given down to visual magnitude and it is estimated that if CETI signals were transmitted from all stations 2 million stars could be reached.
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