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Reception conditions will constantly change
because of vehicle movement. Buildings, ter-
rain, signal distance and interference from
other vehicles can adversely affect ideal re-
ception. Described below are some of the
factors that can affect radio reception.
Some cellular phones or other devices may
cause interference or a buzzing noise to come
from the audio system speakers. Storing the
device in a different location may reduce or
eliminate the noise.
FM radio reception
MAXIMUM SIGNAL DISTANCES
• FM : 25 to 30 miles (40 to 48 km)
• AM : 60 to 130 miles (97 to 209 km)
Range: FM range is normally limited to 25 to
30 miles (40 to 48 km), with monaural (single
station) FM having slightly more range than
stereo FM. External influences may some-
times 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 transmit-
ter and receiver. FM signals follow a line-of-
sight path, exhibiting many of the same char-
acteristics 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 an in-
creased distance from the station transmit-
ter, static or flutter can be heard. This can be
reduced by lowering the treble setting to re-
duce the treble response.
Multipath reception: Because of the reflec-
tive characteristics of FM signals, direct and
reflected signals reach the receiver at the
same time. The signals may cancel each
other, resulting in momentary 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 bounce
off the ionosphere and be bent back to earth.
Because of these characteristics, AM signals
are also subject to interference as they travel
from transmitter to receiver.
Fading: This occurs while the vehicle is pass-
ing through freeway underpasses or in areas
with many tall buildings. It can also occur for
several seconds during ionospheric turbu-
lence even in areas where no obstacles exist.
SAA0306Z
4-54 Display screen, heater and air conditioner, and audio system
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