What is an uplink signal?

Uplink refers to the signal leaving your device and returning to the cell tower , while downlink refers to the signal coming to your device from the cell tower. All cellular devices, including smartphones and tablets, work within 3G, 4G, 5G RF (radio frequencies).

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Why do we use uplink frequency?

It say basically the power at ground stations is more as compared to power available at satellites.So generally frequency for uplink is kept higher than the downlink . There is greater attenuation due to rain when the signal frequency is high.so downlink is also kept at lower frequency.

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