Manual Silvercrest TWINTALKER 4810 IAN 64461 (page 66 of 96) (English, Italian, Portuguese, Spanish)

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66 Twintalker 4810

Twintalker 4810

13.6 Changing Channels

13.7 CTCSS (Continious Tone Coded Squelch System) /

DCS (Digital Coded Squelch)

License free PMR radio's operating on the 446 MHz frequency band, like the Twintalker 4810

PMR, have 8 available radio channels. If there are many PMR users in your neighborhood,

there is a chance that some of these users are operating on the same radio channel.

To prevent that you receive signals from other users, sub-channels have been integrated.

Two PMR radio's will only be able to communicate with each other when they are operating

on the same radio channel and when they have selected exactly the same sub-channel.

There are two kind of sub-channels :

• Continuous Tone Coded Squelch System (CTCSS)

• Digital Coded Squelch (DCS)

When using CTCSS, a low frequency tone (between 67 and 250 Hz) will be transmitted along

with the voice signal. There are 38 available tones to choose from. You are free to choose

one of these 38 available tones. Due to filtering, these tones will generally not be audible so

they will not disturb the communication.

DCS is similar to CTCSS, but instead of sending a continuous tone of a selected frequency,

a digital data transmission is added to the radio signal. This Digital Code is transmitted at a

really low rate, around 134 bits per second (the code is 23 bits long). Only the PMR's of the

latest generation will support DCS. There are 83 available DCS codes that can be used.

Since earlier models will only support CTCSS it will be better to use DCS to prevent that other

users will be audible during your PMR conversations.

13.7.1 CTCSS

• Press the - button once, the current channel

number flashes on the display.

• Press the - button

or the - button to change

the channel.

• Press the PTT - button to confirm and return to stand-by

mode.

• Press the -button twice : "CTCSS" and the current

CTCSS code flashes on the display.

• Press the -button or the -button to change to

another code.

• Press the PTT-button to confirm and return to stand-by

mode.

If no button is pressed within 5 seconds during setting, the unit will return

to standby.

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Silvercrest TWINTALKER 4810 IAN 64461 Manual

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