Northern Airborne Technology AA9x - Manual (Page 13)

AA9x Series Single Channel Audio Controller
SM56 Installation and Operation Manual
Section 2 Rev: 1.00 Issue 4 Page 2-5
Upon satisfactory completion of all performance checks, make all required log book entries, electrical
load, weight and balance amendments and other documentation as required by your local regulatory
agency before releasing the aircraft for service.
2.5 Adjustments and Connections
The unit is shipped from the factory with all internal adjustments set to the normal test levels. Once
installed in the aircraft, it may be desirable to change some of these settings to best suit the local
operating environment. The internal adjustments are located on the sides of the unit and are shown in
Figure 2 and Figure 3.
2.5.1 Left Side Panel Adjustments
The trimpots on the left side panel shown in Figure 2 are used to adjust the levels of audio in the user’s
headphones. Rotating the trimpots clockwise (cw) increases the level and counter clockwise (ccw)
reduces it.
Figure 2: Left Side Panel Adjustments
2.5.1.1 ALERT LEVEL
The ALERT LEVEL trimpot is used to adjust the level for the internally generated Alert signals. Other
parameters relating to these signals are adjusted from the right side panel.
2.5.1.2 S/T LEVEL
The S/T LEVEL trimpot adjusts the overall sidetone level of all selected transceivers (from the front
panel).
2.5.1.3 VOX LEVEL
The VOX LEVEL trimpot sets the sensitivity level for the front panel VOX control (the level of audio
required to activate microphones).
2.5.1.4 POWER ON
The POWER ON LED will illuminate to indicate that the unit is connected to the power supply.
ENG-FORM: 805-0115.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.