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General information about your radio
7-24 Comfort controls
7
FM signals do not follow the earth surface
nor are they reflected by the upper atmo-
sphere. For this reason, FM broadcasts cannot
be received over long distances. AM signals
follow the earth’s surface and are reflected by
the upper atmosphere. For this reason, AM
broadcasts can be received over longer dis-
tances.
Because of the limited range of FM signals
and the way FM waves transmit, you may
experience weak or fading FM reception.
When the broadcast is blocked by mountains
or similar obstructions, reception can be dis-
turbed.
The reason why one can hear FM but not AM
in parking garages, under bridges etc., is that
FM signals, unlike AM signals, are reflected
by solid objects such as buildings, etc.
Because FM signals are easily reflected by
buildings, this can also cause reception dis-
turbances.
The direct signal from the broadcast station
reaches the antenna slightly before the
reflected signal. This time difference may
cause some reception disturbance or flutter.
This problem occurs primarily in urban areas.
If one listens to a weak station and is in the
vicinity of another strong station, both sta-
tions might be received simultaneously.
CAUTION
Changes or modifications not expressly
approved by the party meeting the above
conditions could void the user’s authority to
operate the equipment.
Signal transmission
FM AM
25 to 40 mile radius
(40 to 64 km)
100 mile radius
(160 km)
Weak reception (fading)
Reflection
Cross modulation
BK0277700US.book 24 ページ ２０１９年３月８日 金曜日 午前９時２３分
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