3M PELTOR LiteCom Plus MT7H7 4410-EU Series Manual page 12

GB
5.1.7 VOX (Voice Operated Transmission)
VOX enables the LiteCom Plus to transmit automatically when sound above a certain level reaches the microphone. This
allows radio transmission without pressing the PTT button (E:15).
Press the + button (E:11) or – button (E:12) to adjust the sensitivity of voice operated transmission. Each change is
confirmed by a voice message. You can choose between five levels or switch this function off. When the level is low it is
easier to transmit. To switch this function off, press the – button (E:12) for two seconds. This is confirmed by the message
"VOX off". The PTT button (E:15) must now be used to transmit. Press the + button (E:11) to switch this function back on.
Alternatively switch voice-operated transmission on or off by briefly press the PTT button twice. A voice message confirms
the current VOX setting.
The radio has a BCLO (Busy Channel Lock Out) function that prevents VOX operation if the channel is being used for
other transmission. An audible tone indicates that the channel is already being used.
NOTE! To activate the VOX function the speech microphone (E:9) must be very close to your mouth, 1–3 mm (figure M).
The user's voice will be heard in the headset when the radio is transmitting.
(M)
5.2 Sub menu
This gives access to settings that are only adjusted occasionally. The sub menu is accessed by pressing the + button
(E:11) and – button (E:12) at the same time for 1 second. To return to the main menu, press and hold the + button (E:11)
and – button (E:12) at the same time again or wait 10 seconds without pressing any button to return automatically to the
main menu.
5.2.1 Squelch (hiss reduction)
"Squelch" means that background hiss in the earphones is prevented when the incoming signal is below the set squelch
level.
Press the + button (E:11) or – button (E:12) to adjust the squelch level. Each change is confirmed by a voice message.
You can choose between five levels or switch this function off. A low squelch level may permit longer range. To switch this
function off, press the – button (E:12) for two seconds. This is confirmed by the message "squelch off". Press the + button
(E:11) to switch this function back on.
5.2.2 Sub channel (selective squelch)
When sub channel is active, an inaudible code will be transmitted with speech, and this code is used to "open" the receiver.
This allows multiple groups of users to use the same channel without hearing other groups. This product supports CTCSS,
Continuous Tone Coded Squelch System, (table N) and DCS, Digital Coded Squelch, (table O) which means there are
121 codes which have been assigned the numbers 1–121. All communication on a channel can be heard if this function is
switched off.
Press the + button (E:11) or the – button (E:12) to select the sub channel. Each change is confirmed by a voice message.
You can choose between 121 tones or switch this function off. To switch this function off, press – (E:12) when sub channel
1 is selected or press the + (E:11) button when channel 121 is selected. This is confirmed by the message "sub channel
off". Press the + button (E:11) to switch this function back on.
NOTE! When the sub channel function is switched on, all other incoming radio communication will be blocked. NOTE!
BCLO (Busy Channel Lock Out) prevents transmission on a busy channel (see 5.1.7 VOX).
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