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49
CONTINUOUS TONE CODED SQUELCH SYSTEM (CTCSS)
CTCSS uses a subaudible tone to control the squelch of
transceivers, and by this system you can reject signals
from undesired stations. Suppose that only stations "A",
"B", and "C" are programmed with the same tone
frequency. The squelch in “A” opens only when called by
“B” or “C”.
USING CTCSS
1 Select the desired band.
2 Repeatedly press
[TONE]
until "CT" appears.
• Each time you press
[TONE]
, the selection changes as
shown below.
3 Select the desired CTCSS frequency.
• To select this, refer to "Selecting a Tone Frequency"
{page 25} and follow steps 2 to 4.
4 When you are called:
The squelch of your transceiver opens only when the
selected tone is received.
When you make a call:
Press and hold Mic [PTT].
Note:
◆
You can select a separate tone frequency for the CTCSS and Tone
functions.
◆
When using DTSS or Page with CTCSS, the squelch opens only if
the correct tone is received and the received DTSS code or Page
code matches the code stored in your transceiver.
◆
If you select a high tone frequency, receiving audio or noise that
contains the same frequency portions may cause CTCSS to function
incorrectly. To prevent noise from causing this problem, select an
appropriate noise squelch level using the SQL control.
■ Automatic Tone Frequency ID
This function automatically identifies the incoming tone
frequency on a received signal.
1 Press
[TONE] (1 s)
to activate the function.
• A tone frequency display replaces the frequency
display and the 1 Hz decimal begins blinking.
• When a signal is received, the transceiver begins
scanning through all tone frequencies in order to
identify the incoming tone frequency. When the
frequency is identified, a beep sounds, and the
identified frequency appears and blinks. The identified
frequency is programmed in place of the currently set
CTCSS frequency.
2 Press any key to cancel the function.
No Indicator
Tone
CTCSS
("T")
("CT")