Tone Squelch Modes (Ctcss, Dcs) - Yaesu FT-50 Instruction Manual

These systems allow silently monitoring until a call
directed to you is received, and offer privacy on an
otherwise busy channel.
- - -
CTCSS Tone Squelch
decode
Note - CTCSS
quires the optional FTT-12 keypad, and a@ cannot
be selected until the unit is installed.
CTCSS am (C
on lnuous Tone Coded Squelch System)
This imposes a continuous, subaudible tone on your
transmitted audio. When decoded at the other sta-
tion, this allows their squelch to open and receive
transmission. Some "closed" repeaters use this
your
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
39 selectable CTCSS tones.
DCS
DCS operation modulates a subaudible tone accord-
ing to a digital protocol (continuous 32-bit synchro-
nous code). DCS is widely used in the commercial
land-mobile industry for its high performance and
104 codes (offers greater privacy than CTCSS).
To use either CTCSS or DCS, both stations must be
on the same frequency, and have selected the same
CTCSS tone or DCS code.
(tone squelch) operation re-
. - - . - . - - . . - - - - _ I -
To activate CTCSS or DCS operation, press a:
ator is activated for transmission only.
tone squelch is activated for both tx & rx (only signals
"encoded" with the matching tone open the squelch).
(tx & rx) is active.
To select a CTCSS tone:
tion. Press &-%e3, to display the default tone at
the right side of the display.
table on the next page), then press ~~ to exit.
the
To select a DCS code:
Press &--+e+j, to display the default code at the
side of the display.
the table on the next page), then press e5 to exit.