Why must a satellite have distinct uplink and downlink frequencies?

What is the reason behind different uplink and downlink frequencies of a satellite?
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unknown user
"A satellite must use different uplink and downlink frequencies for continuous operation in order to avoid interference."
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"This can be done avoiding XT. If, as an example the along -golf links were on a single regularity, it'd function just like some sort of walkie-talking picture, this means only one person could possibly post, the other receive, at a opportunity."
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