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The diagram shows a power P sub t transmitted to the satellite transponder from an earth station which is received by a receiver antenna gain G sub s r in the uplink segment of the satellite communication.

The downlink segment of the satellite communication shows a power P sub r i received by another earth station which is transmitted by a transmitter antenna gain G sub s t.

Free space and atmospheric losses of signal strength take place in both uplink and downlink segments of the satellite communication.