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The person receiving the signal gets it from the Cat repeater, it is "repeating" your signal. That is why when you un-key your radio, you are listening to the output of the repeater just like everyone else listening. When you key your radio you are transmitting on the input of the repeater 147.690, again the repeater "repeats" what you say on the output frequency 147.090 where everyone listens, make sense?