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198n
Radio reception Safety belt tensioner
Radio waves — mediumwave, long-
wave and shortwave — offer a wide
range of reception, because the broad-
cast signals travel not only along the
ground as surface waves, but also as
waves bounced back to earth from the
ionosphere.
Frequency-modulation (FM) provides
substantially better sound quality than
AM. However, because FM transmis-
sions rely on line-of-sight broadcast
waves, their effective reception range is
limited.
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Although numerous factors combine
to impose inherent limitations on the
reception quality available from mobile
radios, specially designed systems can
be employed to minimize their effects:
The Diversity Antenna system employs
several FM antennas integrated within
the rear window. An integral processor
automatically selects the antenna with
the best FM reception quality at any
given time. Because the ongoing
antenna selection process is completed
within milliseconds, it remains inaudible
to the radio listener.
The safety belt tensioner responds to
severe collisions by tightening the belts
to ensure that occupants remain firmly
positioned in their seats. A gas-pres-
sure system retracts the buckle
assembly to tension the shoulder and
lap belts within fractions of a second.
This reduces the tendency to slide
under the lap belt.
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Online Edition for Part No. 01 41 0 155 558 - © 09/00 BMW Group
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