Uplink frequency is the frequency at which, the first earth station is communicating with satellite . The satellite transponder converts this signal into another frequency and sends it down to the second earth station. This frequency is called as Downlink frequency.
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The communication between satellite towards earth station receiver is known as downlink frequency. Downlink frequency of satellite is the frequency at which the satellite is transmitting the signal and earth station receiving it. Downlink frequency range = 3.7 GHz to 4.2 GHz .
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