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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