To gain access to revision questions, please sign up and log in.
- Some VHF transceivers use CTCSS.
- This is a continuous tone below 300 Hz.
- The receiver is only activated if the correct CTCSS tone is present.
- This allows different organisations to share the same frequency without having to listen to each others' transmissions.
- This technique allows better use to be made of the limited number of channels available.
- The CTCSS tone is filtered out by the receiver and not passed to the loudspeaker.
- The range of frequencies needed for voice communication is 300 to 3000 Hz.
- Filtering out frequencies below 300 Hz has little effect on the audio quality.
Contacts, ©, Cookies, Data Protection and Disclaimers
Hosted at linode.com, London