User manual

7Twintalker 9500 (RC-6406) Airsoft Edition
ENGLISH
13.5 Transmitting a Signal
• Press and hold the
PTT
- button
12
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
PTT
- button
12
when you
want to stop transmitting.
To check the channel activity use the monitor function
(See chapter “13.8 Monitor”).
13.6 Changing Channels
• Press the -button
7
once, the
current channel number flashes on the
display
.
• Press the
- button
11
or the -
button
10
to change the channel.
• Press the
PTT
- button
12
to confirm
and return to stand-by mode.
If no button is pressed within 5 seconds during setting,
the unit will return to standby.
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 (RC-6406) 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 ar
e 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 tra
nsmitted 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
7
twice :
"CTCSS" and the
current CTCSS code
flashes on the display.
• Press the
-button
11
or the -
button
10
to change to another code.
• Press the
PTT
-button
12
to confirm and
return to stand-by mode.
13.7.2
DCS
• Press the -button
7
three times :
"DCS" and the curr
ent DCS code flashes
on the display.
• Press the
-button
11
or the -
button
10
to change to another code.
• Press the
PTT
-button
12
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.