Axnes AS
Document number
Revision
Date
AX-PNG-UMAN-1220
Issue C
2018-Jun-05
Page 2-9
Confidential document and information
The MP50 has automatic VOX sensitivity. When starting the MP50, the VOX trigger level
starts at the VOX Min level (set in the menu). If the ambient noise level rises, the VOX trigger
level may adaptively increase. The VOX trigger level will not adapt to lower ambient noise,
and user intervention may be required. The maximum possible VOX trigger level is limited by
the VOX Max level (set in the menu).
If the VOX trigger level is experienced too high by the user, it can be reset by either leaving
VOX mode, entering the VOX Min menu or by disconnecting/connecting the headset (Note:
By disconnecting the headset cable from the MP50, the water resistance is broken, thus
should NOT be done in a humid environment).
All three actions will reset the VOX trigger level to the configured VOX Min level.
The VOX trigger level can be automatically adjusted to VOX Max level by entering the VOX
Max menu.
NOTE 1:
The VOX trigger level can be increased by exposing the microphone to a steady
noise, e.g. by a careful steady blow into the microphone until the sidetone disappears. The
trigger level will increase as indicated to the user by monitoring the side tone.
NOTE 2:
To avoid excessive use of battery and radio capacity, it is important that the VOX
level is set to an appropriate level to avoid inadvertent transmission.
2.11.1 Configuring the VOX Min and VOX Max level
To set the correct VOX Min level, the following procedure can be followed:
•
Enter the VOX Min menu.
•
Tune the VOX Min level so that the VOX is triggered when your normal operational
voice level triggers a sidetone.
To set the correct VOX Max level, the following procedure can be followed:
•
Enter the VOX Max menu.
•
Tune the VOX Max level so that the VOX is not triggering a sidetone until you are
shouting as loud as expected in the noisiest operational condition.
•
After tuning the VOX Max level, enter the VOX Min level menu to reset the trigger.
Note 1: When tuning the VOX Min or Max level, the MP50 is transmitting according to
selected configuration or chosen channel. It is therefore recommended to avoid VHF channel
16 when doing VOX testing/configuring.
Note 2: If setting the VOX Max to a level too low, the VOX will be triggered too often in a
noisy environment. The active VOX sensitivity will be hitting the VOX Max level and thus
never be able to go high enough.
Note 3: If setting the VOX Max to a level too high, a spike in the ambient noise level will raise
the VOX trigger level too much and thus no shouting will be loud enough to trigger the VOX.
