Duplexer RF VHF UHF

Duplexer RF VHF UHF
duplexer:
A set of cavity filters are tuned such that each frequency mereject tx and rx, so that the antenna can be used for tx and rx at the same time.
RECEIVER CAVITIES        Pass 144.77 MHz     Reject 145.37
TRANSMITTER CAVITIES     Pass 145.37 mHz     Reject 144.77