Axnes Aviation AS
Document number
Revision
Date
AX-PSB-UMAN-0027
Issue E
2015-03-05
Page 3-6
3.11.2 Squelch
Per software version 3.0
8
:The squelch can be adjusted by pushing the front PTT button and
simultaneously operate the “Volume-UP” or “Volume-DOWN” buttons.
Software version 3.0
8
and higher: Press the Volume up and Channel down once
simultaneously to enter menu mode. To browse through the menu press channel up/down.
Select option ‘’ SL’’ – the display will change to display the value of the set squelch level. The
squelch level can be adjusted by using the Vol up / down buttons to set as required.
When optimal level is found press the side PTT button to save and exit.
Correct squelch setting is depending on the operation environment. Typically the squelch
setting is set between 20
–27.
3.11.3 Automatic Gain Control (AGC)
8
The MP20 features an Automatic Gain Control (AGC) on the microphone input, to secure
optimal performance in environments where the background noise varies. The AGC is
central for the MP20 performance in noisy environments and should always be activated.
It is possible to toggle the AGC setting by pressing the Volume up and Volume down once
simultaneously. The display will show either “On” or “OF”, indicating the AGC status. It is not
recommended to turn AGC off.
Note1:
Please note that each time you actuate the buttons to check the AGC setting - you
toggle the setting on or off.
Note2: Experience shows that toggling AGC on/off may happen inadvertently. It is
therefore strongly recommended that the users of the equipment know how to check
the AGC status, to secure optimal performance of the equipment.
3.11.4 Analogue Trigger Level (NIVOX Threshold)
Analogue trigger level is the level of the voice overlaid on the background noise needed to
trigger VOX. Lowering the analogue trigger level will make the VOX operation of the radio
more sensitive to rapid changes in the background noise, and will require less voice overlay
to trigger transmission. Increasing the setting will make the radio VOX operation more robust
to rapid changes in the background noise, but will require higher levels of voice overlay to
trigger transmission.
To adjust the analogue trigger level, press the Volume up and Channel down once
simultaneously to enter menu mode. The display should show ‘’AL’’.
8
Possibility of changing Automatic gain control, default NIVOX/PTT mode, and display orientation is
not available for software version 3.0 and higher. Units with software version 3.0 or higher will show
the software version as two digits in the display at startup.
