BMW SERIE 3 CONVERTIBLE 2000 Bedienungshandbuch PDF herunterladen (Seite 174)

174n

Radio reception Safety belt tensioner

The AM frequency bands (medium-

wave, long-wave and short-wave)

make it possible to receive stations

from a great distance, because the

broadcast signals travel not only along

the ground as surface waves, but also

as atmospheric waves that are re-

flected from the ionosphere.

Frequency-modulation (FM) provides

substantially better sound quality than

the other frequencies. However,

because FM transmissions rely on line-

of-sight broadcast waves, their effec-

tive reception range is limited.

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The limitations inherent to radio recep-

tion in a moving vehicle have been min-

imized by a number of innovative sys-

tem designs:

The "Radio Data System" (RDS) makes

sure that, for stations broadcasting on

several frequencies, the radio automati-

cally tunes to the frequency with the

best reception quality.

With the Diversity Antenna system, sev-

eral FM antennas are integrated within

the convertible top compartment lid to

provide three separate sources for re-

ceiving broadcast waves. An integral

processor automatically selects the an-

tenna with the best FM reception qual-

ity at any given time. The selection of

the antenna takes place within millisec-

onds, and is therefore not noticed by

the radio listener.

The safety belt tensioners respond to

severe head-on collisions by tightening

the belts to ensure that occupants

remain firmly positioned in their seats.

A gas-pressure system retracts the

buckle assembly to tension the shoul-

der and lap belts within fractions of a

second. This reduces the tendency to

slide under the lap belt.

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