Axnes Aviation AS
Document number
Revision
Date
AX-PSB-UMAN-0027
Issue E
2015-03-05
Page 3-5
3.10 Pressure Equalizing Actuator
Significant changes in altitude and/or temperature may make the PTT button difficult to press
or may unintentionally activate the transmitter due to over or under pressure within the
MP20. To overcome this the
”Pressure Equalising Actuator” located on the top of the
transmitter should be manually operated by pushing the centre pin to one side with a finger.
The pressure inside and outside of the MP20 will be equalised, see illustration below.
Push sideways to activate the Equalizing.
3.11 Default Settings
The MP20 is configured with the following default settings:
Automatic Gain Control: Factory default ‘On’
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Squelch: Factory default 19
Power on volume: Factory default 4 (not changeable in field)
NIVOX/PTT mode: Factory default ‘NIVOX’
Analogue level: Factory default 78
Changing the defaults is described in the following.
3.11.1 Select NIVOX or PTT default
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.
When a helmet/headset is connected to the MP20, the mode of operation will be activated
according to a default setting.
To select PTT as default configuration when a helmet/headset is connected: Press and hold
the front PTT button simultaneously with power up. The MP20 is now set to default PTT
mode.
To select NIVOX as default configuration when a helmet/headset is connected: Press and
hold the side PTT button simultaneously with power up. The MP20 is now set to NIVOX
mode.
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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.
