CONTINUOUS TONE CODED SQUELCH SYSTEM (CTCSS)

 

 

 

 

 

 

 

 

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CTCSS uses a subaudible tone to control the squelch of

Note:

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transceivers, and by this system you can reject signals

◆ You can select a separate tone frequency for the CTCSS and Tone

 

from undesired stations. Suppose that only stations "A",

functions.

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◆ When using DTSS or Page with CTCSS, the squelch opens only if

"B", and "C" are programmed with the same tone

 

the correct tone is received and the received DTSS code or Page

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frequency. The squelch in “A” opens only when called by

code matches the code stored in your transceiver.

“B” or “C”.

 

 

 

 

◆ If you select a high tone frequency, receiving audio or noise that

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contains the same frequency portions may cause CTCSS to function

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

incorrectly. To prevent noise from causing this problem, select an

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USING CTCSS

 

 

 

 

appropriate noise squelch level using the SQL control.

 

 

 

 

■ Automatic Tone Frequency ID

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1 Select the desired band.

 

 

 

 

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2 Repeatedly press [TONE] until "CT" appears.

This function automatically identifies the incoming tone

 

frequency on a received signal.

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• Each time you press [TONE], the selection changes as

1 Press [TONE] (1 s) to activate the function.

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shown below.

 

 

 

 

No Indicator

 

 

Tone

 

 

CTCSS

• A tone frequency display replaces the frequency

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display and the 1 Hz decimal begins blinking.

 

 

 

 

 

 

("T")

("CT")

 

 

 

 

• When a signal is received, the transceiver begins

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scanning through all tone frequencies in order to

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identify the incoming tone frequency. When the

3 Select the desired CTCSS frequency.

 

 

 

frequency is identified, a beep sounds, and the

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• To select this, refer to "Selecting a Tone Frequency"

identified frequency appears and blinks. The identified

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frequency is programmed in place of the currently set

{page 25} and follow steps 2 to 4.

 

 

CTCSS frequency.

 

4 When you are called:

 

 

 

 

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2 Press any key to cancel the function.

The squelch of your transceiver opens only when the

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selected tone is received.

 

 

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When you make a call:

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Press and hold Mic [PTT].

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