Amateur Extra › E7 Practical Circuits › E7C10
E7C10
Which of the following filters is used in a 2-meter band repeater duplexer?
Pick an answer to check it.
Answer: B. A cavity filter
A repeater duplexer must separate transmit and receive frequencies only a few hundred kHz apart while handling transmitter power. High-Q cavity filters do this job.
Tip: Duplexer = cavities.