Northern Airborne Technology DA80 - Manual (Page 10)

DA80 Series DigiVOX™ Digital Intercom Manual SM57 Rev. 4.10
2.3
Installation Procedures
2.3.1 Warnings
Do not bundle any lines from this unit with transmitter coax lines. Do not bundle any
audio or DC power lines from this unit with 400 Hz synchro wiring or AC power lines. Do
not position this unit or wiring from this unit next to any device with a strong alternating
magnetic field such as an inverter, or significant audio interference will result.
2.3.2
Cautions
In all installations, use shielded cable exactly as shown and ground as indicated.
Significant ground loop and noise problems may result from not following these guidelines.
Ensure that the chassis is grounded to provide proper shield terminations.
Ensure the microphone and headphone jacks are isolated from the airframe ground.
Use caution when routing microphone wiring, as it carries low-level signals prone to
coupling from other sources.
Do not take a ground from the instrument panel or similar location that shares a ground
return with a turn and bank, horizon or other motor driven instrument. This may cause
the unit to pick up the sound of the motor as ground loop interference.
2.3.3
Notes
The DA80 DigiVOX™ is designed to be used in place of the AA80-001 InterVOX™ unit.
If installing this unit into an existing aircraft harness, ensure that the harness connector
does not have the ‘tabs’ shown in figure 1. If the harness connector does have ‘tabs’,
replace the existing harness connector with the one included in the install kit.
Tab
Harness Connector
Figure 1
Page 2-2 Oct 13, 2004
ENG-FORM: 805-0104.DOT
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