Manual Topcom Twintalker 9500 - RC 6406 (page 7 of 148) (English, German, Dutch, Danish, French, Italian, Polish, Portuguese, Swedish, Spanish, Norwegian, Finnish)

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7Twintalker 9500 Airsoft Edition

ENGLISH

13.5 Transmitting a Signal

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 9500 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

13.7.2 DCS

• Press and hold the - button to

transmit. The TX symbol is displayed.

• Hold the unit in a vertical position with the

microphone 10cm from the mouth and

speak into the microphone.

• Release the - button when you

want to stop transmitting.

To check the channel activity use the monitor function

(See chapter “13.8 Monitor”).

• Press the -button once, the

current channel number flashes on the

display.

• Press the - button or the -

button to change the channel.

• Press the - 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.

PTT

• 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 -button to confirm and

return to stand-by mode.

• Press the -button three times :

"DCS" and the current DCS code flashes

on the display.

• Press the -button or the -

button to change to another code.

• Press the -button to confirm and

return to stand-by mode.

To disable CTCSS or DCS, select code "00" for CTCSS or

for DCS in the menu. When the entry is confirmed, "OF"

will be displayed.

PTT

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Topcom Twintalker 9500 - RC 6406 Manual

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