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what is the difference between duplexer & diplexer?

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wireless man

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Dear All,
May you tell me what is the difference between duplexer & diplexer? Thanks.
 

1) A duplexer is generally a 3 port device (for example a circulator) that permits you to have RX and TX at the same time by using the same antenna

2) A diplexer is generally a 3 port device that permits to multiplex 2 bands incoming at the input port over two different outputs, each band is forwarded to one output (for example a diplexer could be used to sepatate tv+satellite bands over the same coaxial cable into two different cables).
 

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