Hellberg Local 446 Gebrauchsanweisung Seite 9

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.
Sidetone
Playback of the transmitted audio in the headset (1, 2, 3, 4,
MAX). Confirms that transmission has been triggered and
helps the user to speak at normal levels.
Advanced menu
When the display is in its home screen, press and hold both
the up and the down buttons to enter the advanced menu
<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>
<Voice> Deactivate voice prompts for navigation
and settings, <ON, OFF>
<Version> Version and serial number
<Squelch>
Set the squelch threshold,
<OFF, 1, 2, 3, 4, MAX>
<Audio> Audio configuation. Switch the radio and
bluetooth audio between left and right side.
<Reset> Reset settings to factory default. Confirm
with up or down button.
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
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.
Battery save function
The headset has built in battery save function that turns the
headset off when not used. When no movement has been
detected for 10 minutes the headset tuns off, otherwise it
turns of after 2 hours of inactivity.
Low battery warning
When the battery power is decreasing and approximately
10% of operation remains, a voice prompt "battery low"
will be heard in the headset. The batteries should then be
charged as soon as possible. The headset will turn OFF
when the batteries are drained.
Replacement of battery pack
Unscrew the thumbscrew (A18) that secures the battery
pack (A17). Remove the battery pack from the earcup.
Be careful and make sure the sealing gasket is in place
around the edge of the battery pack compartment on the
headset. Reinserts the battery pack making sure the bottom
protruding part is inserted in its sleeve (B). Gently tighten
the thumbscrew.
Replacement of AA batteries (Accessories)
Unscrew the thumbscrew (A18) that secures the battery
pack (A17). Remove the battery pack from the earcup.
Replace batteries, take note of battery orientation. Only use
included batteries or NiMh batteries with similar capacity.
Warning!
If other battery types than specified are used, risk of
explosion may occur. Dispose used batteries according to
local regulations.
Charging of batteries
Never connect a charger to the headset if disposable
batteries are used. Charge rechargeable batteries prior
to first use. For safety reasons, all headset functions are
automatically switched OFF when charging.
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