Kenwood TH-55AT Series - Manual (Page 17)

Tone Frequency
• Tone Activation
To activate the TONE function depress the TONE switch on
the top of the transceiver. The tone indicator will appear in
the display to signify the tone has been activated. To turn
the tone OFF press the TONE key again.
Tone frequency selection
1. Press the CTCSS key for
longer than 1 second.
The current tone fre­
quency
will be dis­
played.
2. Rotate the Tuning con­
trol until the desired
tone frequency appears
in the display.
3. Press the TONE key to
turn to the normal fre­
quency display.
4. If CTCSS (Tone Sque­
lch) is not desired press the CTCSS key to cancel the
function. The transmit tone will still be active.
Note:-----------------------------------------------------------------------------------------
When no Tone Unit is installed, pressing the TONE key will not
transmit a subtone, even if the indicator is ON.
In Europe a 1750 Hz tone is used in transmit. Press and
hold the TONE key to transmit the access tone, then press
the PTT switch.
In the United Kingdom a 1750 Hz tone burst at the beginn­
ing of each transmission is used. Press the Tone key.
Since use of this tone is required in the Europe and the
United Kingdorn, an 1750 Hz tone encoder is encluded as
standard equipment.
67.0 Hz 110.9 Hz 173.8 Hz
71.9 Hz 114.8 Hz 179.9 Hz
74.4 Hz 118.8 Hz 186.2 Hz
77.0 Hz 123.0 Hz 192.8 Hz
79.7 Hz 127.3 Hz 203.5 Hz
82.5 Hz 131.8 Hz 210.7 Hz
85.4 Hz 136.5 Hz 218.1 Hz
88.5 Hz 141.3 Hz 225.7 Hz
91.5 Hz 146.2 Hz 233.6 Hz
94.8 Hz 151.4 Hz 241.8 Hz
100.0 Hz 156.7 Hz 250.3 Hz
103.5 Hz 162.2 Hz
107.2 Hz 167.9 Hz
18
• CTCSS (Tone Squelch) Operation
1. To actuate the CTCSS (tone squelch) function (decode)
select the desired tone frequency as described above
but do not press the CTCSS key the second time.
2. Squelch will now open only when the transceiver
receives the same subtone frequency.
3. To release tone squelch operation press the CTCSS key.
The CTCSS indicator should go out.
It is a good operating practice to check the frequency
before transmitting. A MONITOR switch has been provided
for this purpose when using the CTCSS (tone squelch)
function. Pressing this switch will open the squelch so you
can check for activity.
• TSU-6 (option) installation
1. Remove the backing from f
the cushion (large) that
was provided the TSU-6
and attach it to the back
of the TSU-6.
2. Remove the Battery Pack
and remove the four
Phillips head screws from
the terminal plate of the
transceiver.
3. Turn the terminal plate
over and take out the
cable as shown in the
diagram.
4. Remove the clear tube
covering the connector,
and the resistor inserted
into the connector.
5. Attach the cable from TSU-6 as shown in the diagram.
6. Remove the backing from the other side of the cushion
and attach the TSU-6 to the transceiver.