Lexus RC F Owner's Manual page 252

6. TIPS FOR OPERATING THE AUDIO/VISUAL SYSTEM
FM
Fading and drifting stations: Generally, the
effective range of FM is about 25 miles (40
km). Once outside this range, you may no-
tice fading and drifting, which increase with
the distance from the radio transmitter.
They are often accompanied by distortion.
Multi-path: FM signals are reflective, mak-
ing it possible for 2 signals to reach the vehi-
cle'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 sig-
nals are blocked by buildings, trees or other
large objects. Increasing the bass level may
reduce static and fluttering.
Station swapping: If the FM signal being lis-
tened to is interrupted or weakened, and
there is another strong station nearby on
the FM band, the radio may tune in the sec-
ond station until the original signal can be
picked up again.
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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 sta-
tion, causing the radio station to sound al-
ternately strong and weak.
Station interference: When a reflected sig-
nal and a signal received directly from a ra-
dio station are very nearly the same
frequency, they can interfere with each oth-
er, making it difficult to hear the broadcast.
Static: AM is easily affected by external
sources of electrical noise, such as high ten-
sion power lines, lightening or electrical
motors. This results in static.