Toyota Corolla Manual page 65

FM
Fading and drifting stations: Generally,
the effective range of FM is about 25 miles
(40 km). Once outside this range, you may
notice fading and drifting, which increase
with the distance from the radio transmit-
ter. They are often accompanied by distor-
tion.
Multi-path: FM signals are reflective, mak-
ing it possible for two signals to reach your
antenna at the same time. If this happens,
the signals will cancel each other out,
causing a momentary flutter or loss of re-
ception.
Static and fluttering: These occur when
signals are blocked by buildings, trees, or
other large objects. Increasing the bass
level may reduce static and fluttering.
Station swapping: If the FM signal you
are listening to is interrupted or weakened,
and there is another strong station nearby
on the FM band, your radio may tune in the
second station until the original signal can
be picked up again.
5. TIPS FOR OPERATING THE AUDIO SYSTEM
AM
Fading: AM broadcasts are reflected by
the upper atmosphere  especially at
night. These reflected signals can interfere
with those received directly from the radio
station, causing the radio station to sound
alternately strong and weak.
Station interference: When a reflected
signal and a signal received directly from a
radio station are very nearly the same fre-
quency, they can interfere with each other,
making it difficult to hear the broadcast.
Static: AM is easily affected by external
sources of electrical noise, such as high
tension power lines, lightening, or electri-
cal motors. This results in static.
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