CP-2156 Life In The Universe

Figure 6. Radio signature of Earth as revealed in a synoptic series of spectra (10-kHz resolution) in one of the very high-frequency bands assigned to TV broadcasting on December 21, 1978. The Arecibo telescope was pointed alternately on and off the Moon; reflected signals were taken to be only those absent in the off spectrum. Probable identifications, based on frequency allocations for video carriers, are indicated.

Figure 6. Radio signature of Earth as revealed in a synoptic series of spectra (10-kHz resolution) in one of the very high-frequency bands assigned to TV broadcasting on December 21, 1978. The Arecibo telescope was pointed alternately on and off the Moon; reflected signals were taken to be only those absent in the off spectrum. Probable identifications, based on frequency allocations for video carriers, are indicated.

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