Motorola Duplexer For Slx Repeater

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What is a duplexer?

A duplexer is a three port filtering device which allows transmitters and receivers operating at different frequencies to share the same antenna. A duplexer typically consists of two band pass filters connected in parallel. One filter provides a path between the transmitter and the antenna, the other provides a path between the antenna and the receiver. No direct path between the transmitter and receiver exists.