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Reception conditions will constantly change be-
cause of vehicle movement. Buildings, terrain,
signal distance and interference from other ve-
hicles can work against ideal reception. De-
scribed below are some of the factors that can
affect your radio reception.
FM RADIO RECEPTION
Range: FM range is normally limited to 25 – 30
miles (40 – 48 km), with monaural (single chan-
nel) FM having slightly more range than stereo
FM. External influences may sometimes interfere
with FM station reception even if the FM station is
within 25 miles (40 km). The strength of the FM
signal is directly related to the distance between
the transmitter and receiver. FM signals follow a
line-of-sight path, exhibiting many of the same
characteristics as light. For example, they will
reflect off objects.
Fade and drift: As your vehicle moves away from
a station transmitter, the signals will tend to fade
and/or drift.
Static and flutter: During signal interference from
buildings, large hills or due to antenna position
(usually in conjunction with increased distance
from the station transmitter) static or flutter can
be heard. This can be reduced by adjusting the
treble control to reduce treble response.
Multipath reception: Because of the reflective
characteristics of FM signals, direct andreflected
signals reach the receiver at the same time. The
signals may cancel each other, resulting in mo-
mentary flutter or loss of sound.
AM RADIO RECEPTION
AM signals, because of their low frequency, can
bend around objects and skip along the ground.
In addition, the signals can be bounced off the
ionosphere and bent back to earth. Because of
these characteristics, AM signals are also sub-
ject to interference as they travel from transmitter
to receiver.
Fading: Occurs while the vehicle is passing
through freeway underpasses or in areas with
many tall buildings. It can also occur for several
seconds during ionospheric turbulence even in
areas where no obstacles exist.
Static: Caused by thunderstorms, electrical
power lines, electric signs and even traffic lights.
SATELLITE RADIO RECEPTION (if so
equipped)
When the satellite radio is first installed or the
battery has been replaced, the satellite radio may
not work properly. This is not a malfunction. Wait
more than 10 minutes with satellite radio ON and
the vehicle outside of any metal or large building
for satellite radio to receive all of the necessary
data.
The satellite radio mode will be skipped unless an
optional satellite receiver and antenna are in-
stalled and an XMா satellite radio service sub-
scription is active. Satellite radio is not available
in Alaska, Hawaii and Guam.
Satellite radio performance may be affected if
cargo carried on the roof blocksthe satellite radio
signal.
If possible, do not put cargo over the satellite
antenna.
4-42 Monitor, climate, audio, phone and voice recognition systems
੬ REVIEW COPY—
2008 Armada (wzw)
Owners Manual—USA_English (nna)
03/05/07—arosenma
੭