Showing the potential for out of band interference.

Swept responses of a "typical" commercial six cavity VHF duplexer:

• receive port
  • 100 to 200 MHz
  • 1 MHz to 1001 MHz
  • Receive port with dual band pass filter 1 MHz to 1001 MHz

• Transmit port
  • 100 to 200 MHz
  • 1 MHz to 1001 MHz

• 900 MHz duplexer
  • 200 to 1400 MHz Rx port with and without 2 bandpass resonators in addition to the duplexer.