AA95-1000TSO Single Channel Audio Controller
Installation and Operation Manual
Rev 1.01
CONFIDENTIAL AND PROPRIETARY TO COBHAM
Page 2-4
2.4
Adjustments
and Connections
The unit ships 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 as follows:
2.4.1
Left Side Panel Adjustments
The trimpots on the left side panel are used to adjust the levels of audio in the user’s headphones.
Rotating the trimpots cw increases the level, and ccw reduces it.
The
ALERT
LEVEL
trimpot is used to adjust the levels for the three internally generated Alert signals.
Other parameters relating to these signals are adjusted from the right side panel (see section 2.5.2.)
The
S/T LEVEL
trimpot adjusts the internal gain of the sidetone of the selected transceiver (from the front
panel) in the user’s headphones.
The
VOX
LEVEL
trimpot sets the sensitivity level for the front panel VOX control (the level of audio
required to activate microphones).
The
POWER ON
LED will illuminate to indicate that the unit is connected to the power supply.
2.4.2
Right Side Panel Adjustments
A variety of different signals can be selected to trigger the internal Alert signals. The trimpots on the right
side panel are used to adjust the characteristics of the audible signals that the user will hear.
Audio Alert 1 is a single tone signal and Audio Alert 2 and the call chime are two tone signals. The pitch
of the signals can be adjusted using the relevant
TONE
trimpot, and the cycling rate of the two-tone
signals can be adjusted using the
RATE
trimpots. The duration of the call chime can be adjusted from
one to three seconds using the
TIME
trimpot.
The
DIR AUD LEVEL
trimpot is used to adjust the audio level of the devices connected to the DIR AUD
input.