Acura 2009 TL Owner's Manual page 300

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The XM satellites are in orbit over
the equator; therefore, objects south
of the vehicle may cause satellite
reception interruptions. To help
compensate for this, ground-based
repeaters are placed in major
metropolitan areas. Satellite signals
are more likely to be blocked by tall
buildings and mountains the farther
north you travel from the equator.
Depending on where you drive, you
may experience reception problems.
Interference can be caused by any of
these conditions:
Driving on the north side of an
east/west mountain road.
Driving on the north side of a
large commercial truck on an
east/west road.
Driving in tunnels.
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Playing the XM Radio (Models with navigation system)
Signal may be blocked by
mountains or large obstacles
to the south.
Driving on a road beside a vertical
wall, steep cliff, or hill to the south
of you.
Driving on the lower level of a
multi-tiered road.
Driving on a single lane road
alongside dense trees taller than
50 ft. (15 m) to the south of you.
Signal weaker in
these areas.
SATELLITE
GROUND REPEATER
2009 TL
There may be other geographic
situations that could affect XM Radio
reception.
As required by the FCC:
Changes or modifications not expressly
approved by the party responsible for
compliance could void the user's
authority to operate the equipment.
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