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H E A D S
U P
T E C H N O L
can be strapped to change this pre-set level to +4.5dBV, +9dBV, -9dBV or
–15dBV at system start-up.
Volume Control On/Off: By default the receivers audio output volume can be
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adjusted from the user interface (remote control or CEMS), or the inputs can be
strapped for a fixed audio output. When volume control is allowed, the power-up
volume choices are –9dBV or 0dBV. Please note, mute conditions (as with a PA
or command sent from the CEMS) will override the fixed setting.
Volume Save: By default the receivers volumes are pre-set at system start-up.
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When this feature is enabled, each receiver stores it's volume setting in non-
volatile memory (every 30-seconds) and returns to this setting after a re-start of
the system. Please note, this feature overrides the "power-up volume" setting
above.
Disable Channel Announcements: By default the XMR announces the XM station
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when the tuned, when enabled the station announcements are disabled.
Refer to the typical wiring reference diagram, dwg. no. XMR-3A or XMR-3B for a logic
table that defines how the inputs are to be connected for the desired functionality.
3.6 System Mounting
All system components are to be mounted to the aircraft structure. Dimensional and
weight information shall be acquired from the applicable Interface Control Drawing (ICD)
for the component being mounted. Special requirements for the location and mounting of
the components are explained in the following sections:
3.6.1
Antenna
The antenna must have line-of-sight to one or both satellites for proper reception. The
antenna is intended to be mounted on the top middle or forward section of the fuselage.
This location is best suited where aircraft appendages, which could block reception, are
at a minimum height in the field of view of the antenna.
The antenna is designed and environmentally qualified to be mounted on the external
surface of the aircraft. Refer to the environmental qualification data for more information.
3.6.2
Receiver
The receivers are designed and environmentally tested to be mounted in a semi-
temperature controlled, pressurized or non pressurized area such as an avionics bay or
baggage area. Refer to the environmental qualification data for more information.
As a guideline in selecting a location for the receiver, the following requirements must be
met:
For proper system operation, the antenna to receiver co-axial cable loss is
•
important. The correct loss of the cable depends on the length, type of cable and
gain of the antenna. Refer to Section 3.4 above for additional information.
XMR-3
Rev. C, 04/05/06
O G I E S
XM Radio
Installation Manual
Page 18 of 31
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