Tone Squelch Modes; Ctcss; (Continuous Tone Coded Squelch System); Dcs (Digital Code Squelch) - Yaesu FT-2600M Operating Manual

Repeater systems often require an access signal for activation of the repeater. These access
tones are often required so as to reduce false activation of the repeater by random noises or
other signals on the band. Additionally, these systems can allow silent monitoring of busy
channels until a call directed to your radio is received, offering less disruption to family
activities, etc.
CTCSS (C
ONTINUOUS
This system superimposes a continuous, subaudible tone on your transmitted audio. When
decoded at the other station, the CTCSS signal triggers their squelch to open and receive
your transmission. Some "closed" repeaters use this to limit access, or to prevent signals
intended for other repeaters (with the same input frequency) in fringe areas from locking
up the repeater. There are 47 selectable CTCSS tones provided in the FT-2600M.
114.8
151.4 156.7 159.8 162.2 167.9 173.8 179.9 183.5
186.2 189.9 192.8 196.6 199.5 203.5 206.5 210.7
218.1 225.7 229.1 233.6 241.8 250.3 254.1
DCS (D C
IGITAL
DCS operation modulates a subaudible tone according to a digital protocol (continuous 32-bit
synchronous code). DCS is widely used in the commercial (Land-Mobile) industry because of
its superior performance; its 104 unique codes offer greater immunity to false decoding than
CTCSS, although CTCSS is still more widely used in amateur repeater systems.
To use either CTCSS or DCS, both stations must be on the same frequency, and must have
selected the same CTCSS tone or DCS code.
To select and activate CTCSS or DCS operation:
(1) Press and hold in the [MHz] key for one second, then rotate the Main Dial knob to
select "30 TONE."
(2) Press the [MHz] key, then rotate the Main Dial knob to select the desired squelch type
from the following:
m "ENC" (Encode) appears when the CTCSS tone generator is activated for trans-
mission only.
m "ENC/DEC" (Encode/Decode) appears when the CTCSS Tone Squelch is acti-
vated for both TX and RX (only signals "Encoded" with the matching tone will
open your radio's squelch).
FT-2600M O
PERATING
T S
ONE QUELCH
T C
ONE ODED
CTCSS T ONE
67.0 69.3 71.9 74.4
88.5 91.5 94.8 97.4
118.8 123.0 127.3 131.8 136.5 141.3 146.2
S )
ODE QUELCH
M
ANUAL
M
ODES
S S
QUELCH YSTEM
F REQUENCY (Hz)
77.0 79.7 82.5
100.0 103.5 107.2
Operation
)
85.4
110.9
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25