Toyota IS300h, Manual

Page: 257 / 415

257
6. TIPS FOR OPERATING THE AUDIO/VISUAL SYSTEM
4
AUDIO/VIDEO S
Y
STEM
IS300h/250_Navi_EE
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 transmitter. They are often ac-
companied by distortion.
Multi-path: FM signals are reflective,
making it possible for 2 signals to reach
the vehicle’s antenna at the same time.
If this happens, the signals will cancel
each other out, causing a momentary
flutter or loss of reception.
Static and fluttering: These occur when
signals are blocked by buildings, trees
or other large objects. Increasing the
bass level may reduce static and flutter-
ing.
Station swapping: If the FM signal be-
ing listened to is interrupted or weak-
ened, and there is another strong station
nearby on the FM band, the radio may
tune in the second station until the orig-
inal signal can be picked up again.
Fading: AM broadcasts are reflected by
the upper atmosphere — especially at
night. These reflected signals can inter-
fere with those received directly from
the radio station, causing the radio sta-
tion 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 frequency, 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 elec-
trical motors. This results in static.
FM AM