Why must a satellite have distinct uplink and downlink frequencies? Satellites transmit on one frequency and receive on a different frequency to avoid interference between signals. Also, the uplink must have a higher frequency than the downlink frequency to penetrate the atmosphere. What is uplink and downlink in mobile communications? An uplink is a signal leaving your mobile phone and transmitting it to a cell tower. A downlink is a signal transmitting to your mobile phone from the cell tower.
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