BMW 2001 BMW 530I User Manual

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Index Data Technology Repairs Car care Controls Overview

209n

Radio reception

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 atmo-

spheric waves that are reflected 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 to provide three sepa-

rate sources for receiving broadcast

waves. An integral processor automati-

cally selects the antenna with the best

FM reception quality at any given time.

Because the ongoing antenna selection

process is completed within milli-

seconds, it remains inaudible to the

radio listener.

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2001 BMW 530i