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By international agreement, nobody on earth legally transmits anything on any

wavelength unless he and his equipment are expressly authorized (licensed or

otherwise permitted) to do the transmitting, and the transmission is confined to

a wavelength (frequency) where that type of transmission and output power

are specifically authorized.

The frequency band (wavelengths) between 1420 and 1427 MHz (21.000 to 21.112 cm)

is legally reserved for radio astronomy and space research.

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14y ago

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