3
are five levels plus it can be turned off. As the squelch level
is increased, there will be greater suppression of static noise,
but consequently the range of communication will be reduced.
Conversely, a lower squelch level provides less static noise
reduction but will increase the range of communication. To
switch this function off, push the – button for two seconds. Push
the + button to switch this function back on.
3:4.6 Sub-channel (Canada only)
Sub-channels (selective squelch) use unique inaudible tones
that serve as a passkey, thus limiting what you hear to radios
with the same sub-channel setting. The advantage of sub-
channels is that they can be used to set up multiple private
groups within a single channel. However, it’s important to note
that only one person can transmit on a single channel at any
given time. Therefore, if anybody is transmitting on the channel,
all sub-channels will be blocked during that time. BCLO (Busy
Channel Lock Out) will prevent transmission on a busy channel.
Push the + or the – button to turn the sub-channel on or off.
This product supports Continuous Tone Coded Squelch System
(CTCSS) and Digital Coded System (DCS).
3:4.7 Power
The built-in two-way radio has three output power levels: High,
Medium and Low. A higher output power level increases the
range of radio communication but will consequently decrease
the battery life. Use the + or the– buttons to select the output
power level. A voice message confirms the new setting.
3:4:8 Language
Choose your prefered language by p or -.
3:5 PTT (Push-To-Talk)
The PTT button is used to manually control the two-way radio
transmission. Push the PTT button when you intend to transmit.
4. MAINTENANCE
4:1 Replacing the ear cushions (Fig. G)
(G:1) Slide your fingers under the edge of the ear cushion and
pull straight out.
(G:2) Insert the new foam and ear cushion
(G:3). Fit one side of the new ear cushion into the groove of
the earcup and then press on the opposite side until it snaps
into place.
4:2 Cleaning
It is a best practice to remove the ear cushions (see 4:1) if you
have been wearing the earmuffs for a long time or if moisture
has gathered inside the cups. Clean and disinfect the cups,
headband and ear cushions regularly with soap and warm
water. Allow the headphones to dry completely before using
them again. With heavy use, it is recommended that the ear
cushions are replaced at least twice a year.
NOTE:
Do not immerse the hearing protector in water.
4:3 Use and storage conditions
Use Conditions: Do not use the hearing protector at
temperatures below -4°F (-20°C) or above 122°F (50°C).
3.3 Switching the headset on and off
Push and hold the On/Off/Mode button (A:12) for two seconds
to switch the headset on or off. A voice message will confirm
that the unit has been switched on or off. The On/Off/Model
button will flash when the unit is powered on. The current
settings are saved when the headset is switched off. The
automatic power-off time of two hours (factory default) but can
be configured by a 3M Service Technician or an authorized
dealer. Automatic power-off is indicated by a voice message,
“automatic power off” followed by a series of short tones for 10
seconds, then the unit will power off. The automatic power off
can be aborted by pushing a button or by using VOX.
3:4 Menu
Briefly push the On/Off/Mode button (A:12) to browse through
the following menu options:
3:4.1 Surround volume
Push the + or the – button to adjust the environmental sound
volume. There are five volume levels, with level five allowing
a maximum of 82 dB(A). To switch this function off, push the –
button for two seconds. Push the + button to switch the function
back on again.
3:4.2 Radio volume
Push the + or the – button to adjust the two-way radio sound
level. There are five volume levels. To switch this function off,
push the – button for two seconds. Push the + button to switch
this function back on again.
NOTE:
When the volume is switched off, no radio
communication can be heard and all the radio configurations
menus are hidden.
3:4.3 Channel
Push the + or the – button to change the radio channel.
3:4.4 VOX
VOX, or voice operated transmission, is a hands-free feature
that enables radio transmission without having to push a PTT
button. The VOX feature will open the radio channel upon
vocalization and close the radio channel when no speech is
detected (the speech microphone must be placed close to
your mouth (D:2)). There are five VOX levels plus it can be
turned off. Push the + or the – button to adjust the VOX level.
The VOX level defines the acoustic threshold that activates
the radio transmission. Use the lower VOX levels for quieter
environments and higher VOX levels for louder environments.
To switch the VOX function off, push the – button for two
seconds or push the PTT button twice. Push the + button to
switch the VOX function back on. The radio has a BCLO (Busy
Channel Lock Out) function that prevents VOX operation if the
channel is being used for another transmission. A tone indicates
that the channel is currently being used.
3:4.5 Squelch
Squelch is a function that reduces the hiss or static noise
that may be heard during the two-way radio communication.
Push the + or the – button to adjust the squelch level. There
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