TONE CODED SQUELCH
Yaesu FT-8900R Operating Manual Expanded Edition (courtesy of W5JCK)
Page 27 of 77
Tone Coded Squelch
CTCSS Tone System
Many repeater systems require that a very-low-frequency audio tone be superimposed on your
FM carrier in order to activate the repeater. This helps prevent false activation of the repeater
by radar or spurious signals from other transmitters. This tone system, called
CTCSS
(Continuous Tone Coded Squelch System), is included in your
FT−8900R
, and is very easy to
activate.
CTCSS
setup involves two actions: Setting the
Tone Mode
and then setting of the
Tone
Frequency
. These actions are set up by using the
Set
mode
Menu #40
TONE M
and
Menu #39
TONE F
.
1.
Press the
SET key
momentarily to enter the
Set
mode.
2.
Rotate the
DIAL
knob to select
Menu #40
TONE M
.
3.
Press the
DIAL
knob momentarily, then rotate the
DIAL
knob so that
ENC
appears on the display; this activates the
CTCSS Encoder
, which allows repeater
access.
You may notice an additional
icon appearing while you rotate the
DIAL
knob in this step. (See
DCS Tone System
on page 28.)
4.
Rotating the
DIAL
knob one more click clockwise in step 3 above will cause
ENC.DEC
to appear. When
ENC.DEC
appears, this means that the
Tone Squelch
system
is active, which mutes your
FT−8900R
’s receiver until it receives a call from another
radio sending out a matching
CTCSS
tone. This can help keep your radio quiet until a
specific call is received, which may be helpful while operating in congested areas.
5.
When you have made your selection of the
CTCSS
tone mode, press the
DIAL
knob momentarily, then rotate the
DIAL
knob one click counterclockwise to
select
Menu #39
TONE F
. This Menu selection allows setting of the
CTCSS
tone
frequency to be used.
6.
Press the
DIAL
knob momentarily to enable adjustment of the
CTCSS
frequency.