Icom IC-4008E, Instruction Manual

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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.
CTCSS: Continuous Tone Coded Squelch System
IC-4008E-2 02.3.23 3:26 PM Page 17 (1,1)