DA80 Series DigiVOX™ Digital Intercom Manual
SM57 Rev. 4.10
2.3.5
Installation Options
The DA80 DigiVOX™ is designed to be used in place of the AA80-001 InterVOX™ unit.
When using a portable cassette/CD player with the DA80, 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. 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 DA80.
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
DA80, or the mute functions may not operate correctly.
2.3.6.1 RECEIVE
LEVEL
The setting can be adjusted by potentiometer RECEIVE LEVEL. The setting cannot be
fully muted. The cw rotation of this control will increase Receive audio input level.
2.3.6.2 TX
LEVEL
The setting can be adjusted by potentiometer TX LEVEL. The setting cannot be fully
muted. The cw rotation of this control will increase TX Mic output signal level.
2.3.6.3 MUSIC
LEVEL
The setting can be adjusted by potentiometer MUSIC LEVEL. The setting cannot be
fully muted. The cw rotation of this control will increase music audio volume level.
Page 2-4
Oct 13, 2004
ENG-FORM: 805-0104.DOT
PROPRIETARY AND CONFIDENTIAL TO NORTHERN AIRBORNE TECHNOLOGY LTD.
