Table of Contents
Advertisement
H E A D S
U P
T E C H N O L
Installation pre-testing is advised if this installation is being performed on several similar
aircraft such as a fleet. A pre-test can be performed by mounting the antenna on a piece of
aluminum sheet, approximately 24" in diameter or square, to serve as a temporary ground
plane. This antenna assembly would then lay on the aircraft skin near the proposed
installation location for an active ground test prior to cutting mounting holes. This has
proven both beneficial and cost effective in past fleet installations since all transmit
equipment can be operated and tested for XM receiver interference prior to the actual
installation.
This installation manual does not contain approved data for type specific aircraft antenna
installations.
3.5 Audio Distribution
The installer must determine how to get this audio signal to the listener. For a basic
system, a single channel receiver would be connected to the aircraft's cabin PA, or other
external amplifier would be installed to drive speakers.
For multi-channel systems, a typical scenario is to distribute the individual audio signals
to headphone jacks near the passenger seats that also incorporates a switch panel for
channel control (see Figure 3 above).
3.5.1
Audio Playback Interruption
For most aircraft operations, it is necessary to interrupt the playback in the event of a
passenger address (PA) from the crew. The system (receiver) incorporates an input to
mute the audio output upon sensing a "page key" or other PA signal. For most
applications, this input can be spliced in parallel to the existing PA-key wire that runs
from the cockpit to the PA system, provided this is a ground-active signal.
3.5.2
Default Audio Playback Configuration
The system also provides (4) "configuration strap" inputs to set the volume and XM
station announcement features of the system.
Power-up Volume: By default (inputs not connected), all receivers normalize their
•
volume to a commercial line-level setting (0dBV) at system start-up, or the inputs
2
The functionality described in Sections 3.5.1 and 3.5.2 apply to products programmed with Ver.
1.16 or later software.
XMR-3
Rev. C, 04/05/06
O G I E S
NOTE:
2
XM Radio
Installation Manual
Page 17 of 31
Advertisement
Table of Contents
