Northern Airborne Technology AA85 - Manual (Page 20)

AA85 InterVOX II™ Intercom Manual SM38 Rev. 4.10
In addition, there are 2 user selectable options available through CONFIG switches 3
and 4. They are:
CONFIG 3 - Portable Tape/CD or CD Changer
This allows the user to input music from either a portable cassette/CD player (phone
output) or CD changers/am/fm cassette players (line output). Select this switch to
the down position to accept music from the ‘phone’ output of a portable cassette/CD
player. Select this switch to the up position to accept music from the ‘line’ output of
a CD changer/am/fm cassette player. When using a portable cassette/CD player,
NAT recommends that the phone output should be used for interface to increase
tone control and volume. (The ‘line out’ output lacks volume and tone control.) Set
the volume about half way.
CAUTION
Certain aircraft installations may use a car type, am/fm cassette or CD
player. For best performance and simplicity of installation, use the ‘line’
output from the stereo unit and set the CONFIG 3 switch to the up
position. If it is necessary to use the ‘speaker’ outputs from the stereo
unit, a floating ground adapter and input attenuation network (resistors)
may be required to provide the correct system interconnect and to prevent
damage to the music input(s) of the AA85.
CONFIG 4 - Crew Music Mute
This feature allows the crew to have the music muted when operating in the Crew
mode. Select this switch to the down position so the crew will hear the music at the
muted level set by the MUSIC MUTE C trimpot. See the Operation section 3.3.6 for
more information. Select this switch to the up position so the crew will hear the
music at the music volume level.
Note: CONFIG switch 6 is a spare and has no connection.
2.3.6
Adjustments
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 along
the left side of the unit and are as follows:
CAUTION
Before performing the following adjustments ensure the aircraft radio’s
volume control is set to produce 2.5 Vrms
±10 % at the input to the AA85,
or the mute functions may not operate correctly.
Page 2-6 June 9, 2004
ENG-FORM: 805-0106.DOT
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