Ctcss Continuous Tone Coded Squelch System | Icom IC-4008E specification

CTCSS: Continuous Tone Coded Squelch System 6

✔What is CTCSS (Continuous Tone Coded Squelch Sys- tem) GROUP MODE ?

CTCSS (Continuous Tone Coded Squelch System) GROUP MODE allows communication with silent stand by. Only signals containing your group code can open the squelch.

This conveniently eliminates unwanted audio and is useful in group activities or security related activities where unwanted output can be a problem. Note that CTCSS group mode is not private—anyone can receive your calls.

The IC-4008E is equipped with 38 tone codes for CTCSS GROUP MODE use. Selecting a code applies it to all 69 oper- ating channels. Each push of [PTT] superimposes your group code over your transmit signal; and, only signals containing the same code can open your squelch. To temporarily hear all sig- nals (including noise) push and hold [MODE]. Do not use CTCSS GROUP MODE if you want to be able to hear signals on all channels.