B&G electronics Dual-Vox LTF Manual De Instalación Y Operación página 5

LTG LTG
Automatic dimming function
After one minute of inactivity on the internal
microphone, the volume automatically
decreases to prevent the reproduction of exterior
background noise while the equipment is not in
use. The function indicator displays a slow-paced
fl ashing green light, showing that automatic
dimming is active.
Once the internal unit detects activity again
(picks up voice on the internal microphone or
receives activity from any knob/button), the
volume goes back to its normal level.
To deactivate automatic dimming so that the volume never decreases automatically,
press and hold Mute during 3 seconds. To activate it, repeat the procedure.
Emergency siren function
The equipment includes an emergency siren sound.
To activate the siren, pull down the function selector
to Siren position. While the siren is on, the intercom
function is deactivated.
To turn the siren off, pull up the switch.
Shut down
To shut down the equipment, pull the function control
switch to its middle position, as shown in the fi gure
to the right.
Calibration of the internal microphone sensitivity
The equipment reproduces only one communication
channel at a time. This means that while the external unit
is reproducing sounds from the internal microphone, the
internal unit will not reproduce sounds from the external
microphone, and the other way around. To calibrate
sensitivity at which the internal microphone takes over
the communication channel, perform the procedure
explained as follows.
Place the fl exible microphone at the distance that will
remain and let us calibrate the sensitivity so that it
takes over the communication channel while talking at
a normal voice volume (see fi gure on the left).
1. While the equipment is off, press and hold Mute for
10 seconds, and then switch the selector ON; the
indicator light will turn on blinking red-green when you
enter calibration mode. Release Mute; the indicator
light will be blinking green while the equipment is on
calibration mode.
2. Talk to the microphone in normal volume while
verifying if the communication channel is being taken
over, meaning that the indicator light turns orange
while speaking.
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LTG-03 LTG-03
OFF Siren Intercom
START
green orange
END
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3. If the indicator light remains green while you speak, the communication channel is
not being taken over, hence you need to increase the sensitivity of the microphone by
turning the Vol Ext knob clockwise. After raising the sensitivity, repeat the procedure
from step 2.
4. Once the indicator light turns orange, meaning that the internal microphone is taking
over the channel at your desired microphone distance and voice volume, you can now
terminate the calibration procedure by pressing and holding Mute for 10 seconds.
While deciding the microphone distance and calibrating, be aware of the fact that
increasing the sensitivity to compensate for a lengthy distance will reduce the privacy
of the counter.
Calibration of the internal volume
The internal speaker maximum volume is defi ned through this procedure, so that
feedback would never occur when the volume is raised during the equipment's operation.
Conducting an adequate calibration is specially important at facilities with low acoustic
isolation.
To calibrate the internal volume follow the procedure explained as follows.
START
1. Pull down the switch to Siren position; the light starts blinking red, this indicates that
the calibration mode has been entered.
2. Turn the Vol Int knob, searching for the position that yields an adequate maximum
volume level.
3. Once the maximum internal volume has been successfully defi ned, fi nish the
calibration procedure by pressing and holding down Mute for 10 seconds.
RECOMMENDATIONS OF USE AND MAINTENANCE
Do not force the microphone to bend, nor
use any type of clamp to keep it bent.
END
If you want to reduce the reach of the
microphone, curve it as shown in the fi gure
above.
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