Mazda 2012 CX-7 Spezifikationen PDF herunterladen (Seite 228)

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qRadio Reception

AM characteristics

AM signals bend around such things as

buildings or mountains and bounce off the

ionosphere.

Therefore, they can reach longer distances

than FM signals.

Because of this, two stations may

sometimes be picked up on the same

frequency at the same time.

Station 2

Station 1

Ionosphere

FM characteristics

An FM broadcast range is usually about

40―50 km (25―30 miles) from the

source. Because of extra coding needed to

break the sound into two channels, stereo

FM has even less range than monaural

(non-stereo) FM.

FM Station

40—50km

(25—30 miles)

Signals from an FM transmitter are similar

to beams of light because they do not

bend around corners, but they do reflect.

Unlike AM signals, FM signals cannot

travel beyond the horizon. Therefore, FM

stations cannot be received at the great

distances possible with AM reception.

AM wave

FM wave

FM wave

100—200 km (60—120 miles)

Ionosphere

Atmospheric conditions can also affect

FM reception. High humidity will cause

poor reception. However, cloudy days

may provide better reception than clear

days.

5-14

Interior Features

Audio System

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