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Literature System Comparisons At 10 L.Y.

9010-033

 

NAME

YEAR WAVELENGTH DIAMETER BEAMWIDTH EIRP TYPE B.W. SNR
Townes 1961 0.500 m 5 m 0.021" 9.9 X 1017 W Coh ------ --------
Oliver 1971 10.6 m 2.25 m 1.0" 4.4 X 1014 W Coh 1 Hz -8 dB
Oliver 1971 1.06 m 22.5 cm 1.0" 4.4 X 1014 W Incoh 3 MHz -12 dB
Townes 1983 10.6 m 10 m 0.22" 8.7 X 1015 W Coh/In ------ --------
Betz 1986 10.6 m 10 m 0.22" 8.7 X 1015 W Coh 1 Hz 19 dB
Kingsley 1990 10.6 m 10 m 0.22" 8.7 X 1015 W Coh 1 Hz 22 dB
Kingsley 1990 0.656 m 10 m 0.014" 2.3 X 1018 W Coh 1 Hz 34 dB
Arecibo 1990 20 cm 300 m 0.04o 2.2 X 1010 W Coh 1 Hz 20 dB
Cyclops 1971 3 cm 3 km 1.0" 9.9 X 1013 W Coh 1 Hz 73 dB

 

Where SNR data is given in cited literature, it has been normalized to a 1 kW transmitter power. Identical transmitters and receiving telescopes assumed. Betz and Kingsley SNRs differ by 3 dB because Kingsley assumes an overall quantum/heterodyning efficiency of 0.5 instead of the 0.25 figure used by Betz.

The proposed Cyclops antenna consisted of a maximum of 900 dishes, each 100 meters in diameter, and spread out over a 6.4 km diameter to avoid vignetting.

 


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