Hellberg Local 446 Gebrauchsanweisung Seite 7

manually with a long press on the on/off button
Menu items
<Channel>
Set the radio channel, <1-16*> (*might vary per region)
<Sub Ch> Set the sub channel for selective squelch (if activated, only transmissions with a matching sub channel will be
heard) <OFF, 1-38>
<VOX> Set the VOX threshold. A lower threshold means a weaker mic signal activates transmission <OFF, 1, 2, 3, 4,
MAX>
<Squelch> Set the squelch threshold, <OFF, 1, 2, 3, 4, MAX>
<TX allow> Sets when transmission is allowed, always, channel free, sub channel match, sub channel mismatch
<TX power> Set the radio's transmitting power, <LO, MED, HI>
<Sidetone> Set volume of your own voice to be heard in the headset when transmitting, <OFF, 1, 2, 3, 4, MAX>
Level-dependent "Active listening" function
Press the LD button (A15) to switch the level-dependant function ON. A voice message confirms the
function and a symbol will show on the display home screen. The volume is adjustable in 5 levels(1,
2, 3, 4, MAX). Adjust the volume by pressing the LD button until you reach your desired volume level. The level will be indicated
with a voice message and on the display. Press and hold the LD button to switch the Level-dependent function OFF. The
headset remembers your last volume setting the next time you switch ON the headset or the level-dependant function.
For use in windy environments it is recommended to fit the two included windshields (B:6). Remove the peel off film and fit the
windshield perfectly centered over the Level Dependant microphones (A7).
This hearing protector is provided with level-dependent attenuation. The wearer should check correct operation before use. If
distortion or failure is detected, the wearer should refer to the manufacturers advice for maintenance and charging of the battery.
Warning! The output of the level-dependent circuit of this hearing protector may exceed the external sound level.
Radio Volume
The volume of the incoming radio can be configured with the up and down buttons (A13 >) (A12 <). The volume is adjustable
in 5 levels (OFF, 1, 2, 3, 4, MAX). The Radio can be turned OFF by turning the volume down, press and hold the down button
when on volume level 1. A radio off notification will be heard with 10 minute intervals. To turn the radio ON increase the radio
volume.
PTT (Push To Talk)
Press and hold the PTT button (A16) to transmit on the selected radio channel. Release the button to stop transmitting
Radio channel (frequency)
Se table E:12 for available channels and frequencies. When two (or more) radios are configured on the same channel, they can
communicate with each other.
Sub channel (selective squelch)
Using sub channels enables multiple groups to use the same radio channel without disturbing each other. When activated,
transmissions are coded with the sub channel and only received messages on the same sub channel will be heard. A unit with
sub channel turned OFF will hear transmissions from all sub channel groups. Sub channel grouping is achieved with sending
units overlaying a tone to the transmitted audio which receiving units can detect and open the selective squelch. See table E:13
for available sub channels and their tone frequencies.
VOX (Voice Operated Transmission)
When the VOX is activated, radio transmission is automatically started when the speech signal from the microphone is above a
certain level (threshold). Double press the PTT button or use the menu to enable/disable the VOX and set the desired threshold
(OFF, 1, 2, 3, 4, MAX). A lower threshold allows a weaker speech signal to activate transmission. A higher threshold might be
needed when the background noise is higher to prevent false triggering of transmission. When enabled, a VOX symbol is shown
on the display home screen. Also when VOX is enabled the PTT button can be used to manually control transmission.
Note, for reliable VOX triggering and clear communication the microphone needs to be correctly rotated and approximately 1
cm from your mouth.
Squelch (radio noise suppression)
Noise from the radio reception is blocked when the incoming signal is below the set squelch threshold (1, 2, 3, 4, MAX). A lower
setting can increase the radio range but might open up for more noise.
TX allow (busy channel lockout)
TX allow configures when radio transmission is allowed from the headset. The setting affects transmissions triggered by the PTT
button as well as the VOX functionality. Two descending tones are given as feedback when transmission is prevented. TX allow
can be configured in the following settings:
Always: transmission is always allowed
Channel free: transmission is allowed if the channel is free
Sub Ch. match: transmission is allowed if the channel is free or if a conflicting transmission is on the same (matching) sub
channel
Sub Ch. mismatch: transmission is allowed if the channel is free or if a conflicting transmission is on another (mismatching)
sub channel
TX power
Sets the power at which the headset transmits the radio signal (LO, MED, HI). Higher power can extend the range or improve
reception for others in challenging environments. Lower power uses less battery when transmitting and extends operating time.
TX power is automatically reduced from HI to MED if battery status is running low. HI TX power is not recommended when using
Alkaline batteries due to reduced operating time.
Sidetone
Playback of the transmitted audio in the headset (OFF, 1, 2, 3, 4, MAX). Confirms that transmission has been triggered and
helps the user to speak at normal levels.
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