64
FTM-10SR O
PERATING
M
ANUAL
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
FTM-10SR
, and
is very easy to activate.
CTCSS setup involves setting the Tone Mode and then setting of the Tone Frequency.
These actions are set up using Menu Items “
F40 SQL TYPE
” and “
F39 SQL TSQF
”.
1. Press and hold the [
VOL/SEL
] key for one second to activate the Menu Mode.
2. Rotate the
DIAL
knob to select Menu Item “
F40 SQL TYPE
”.
3. Press the
key to enable selection of this Menu Item.
4. Rotate the
DIAL
knob so that “
TONE SQL
” appears on the
display. This means that the Tone Squelch system is active,
which mutes your
FTM-10SR
’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.
Note: 1) You may notice a “
REV TONE
” indication on the display while you rotate the
DIAL
knob in this step. This means that the Reverse Tone Squelch system is
active, which mutes your
FTM-10SR
’s receiver (instead of opening the squelch)
when it receives a call from the radio sending a matched CTCSS tone. The
“
T SQ
” icon will blink on the display when the Reverse Tone Squelch system
is activated.
Note: 2) You may notice a “
DCS
” indication on the display while you rotate the
DIAL
knob still more. We’ll discuss the Digital Code Squelch system shortly.
5. When you have made your selection of the CTCSS tone mode, press the
key mo-
mentarily, then rotate the
DIAL
knob three clicks counter-clockwise to select Menu
Item “
F39 SQL TSQF
”. This Menu selection allows setting
of the CTCSS tone frequency to be used.
6. Press the
key to enable adjustment of the CTCSS fre-
quency.
7. Rotate the
DIAL
knob until the display indicates the Tone Frequency you need to use.
8. Press the [
VOL/SEL
] key to save the new setting and exit to normal operation.
Note
: Your repeater may or may not re-transmit a CTCSS tone. Some systems just use
CTCSS to control access to the repeater, but don’t pass it along when transmitting. If the S-
Meter deflects, but the
FTM-10SR
is not passing audio, repeat steps “1” through “4” above,
but rotate the
DIAL
knob
so that “
TONE
” appears.
This will allow you to hear
all traffic on the channel
being received.
CTCSS O
PERATION
67.0
69.3
71.9
74.4
77.0
79.7
82.5
85.4
88.5
91.5
94.8
97.4
100.0
103.5
107.2
110.9
114.8
118.8
123.0
127.3
131.8
136.5
141.3
146.2
151.4
156.7
159.8
162.2
165.5
167.9
171.3
173.8
177.3
179.9
183.5
CTCSS TONE FREQUENCY (Hz)
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
