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These are frequencies used for satellite communications.

Usually in the Gigahertz bands.

Uplink is on a differenct channel to downlink, to avoid interferece.

The Uplink, is the signal sent to the satellite, via a dish antenna, which focuses the signal in the direction of the satellite.

On board the satellite, this signal is changed and re-transmitted, on a different frequency (Downlink), and beamed back to earth.

This way huge distances can be covered on earth, despite the curvature and with minimal power.

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