Two Stations on Earth want to communicate through radio broadcast but are too far away to use conventional means.
Earth stations send information in the form of high powered, high
frequency (GHz range) signals
to satellites which receive and
retransmit the signals back to earth where they are received by other
earth stations in the coverage area of the satellite. The area which
receives a signal of useful strength from the satellite is known as the
satellite's footprint.
The transmission system from the earth station
to the satellite is called the uplink, and the system from the
satellite to the earth station is called the downlink.
The two stations can use a satellite as a relay station for their communication
One Earth Station sends a transmission to the satellite. This is called a Uplink.
The satellite Transponder converts the signal and sends it down to the second earth station. This is called a Downlink.
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