Which of the following components allows the use of a single antenna for both transmitting and receiving?
Duplexer let send/receive happen at the same time, so you don't have to wait until someone says "Over." To do this, they used different but closely related frequencies.
For more info, please see Wikipedia's article on Duplexer
A solid Duplexer info is on Repeater Builder site, article Duplexers
YouTube: A complete video well explains the topic from TRX Lab channel, #141 Basics of Duplexers for radio repeaters; function, alignments and tests
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