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6-17

Interior Comfort

Audio System

Form No. 8S11-EA-03G

▼

Radio 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.

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.

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.

Atmospheric conditions can also affect

FM reception. High humidity will cause

poor reception. However, cloudy days

may provide better reception than clear

days.

Multipath noise

Since FM signals can be reflected by

obstructions, it is possible to receive both

the direct signal and the reflected signal at

the same time. This causes a slight delay

in reception and may be heard as a broken

sound or a distortion. This problem may

also be encountered when in close

proximity to the transmitter.

Ionosphere

Station 1 Station 2

FM Station

40—50 km

(25—30 miles)

Ionosphere

100—200 km (60—120 miles)

FM wave

AM wave

Direct

Reflected wave

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