Mazda MX-5 Bedienungshandbuch PDF herunterladen (Seite 238)

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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.

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 probl em may

also be encountered when in close

proximity to the transmitter.

Reflected wave

Direct

Flutter/Skip noise

Signals from an FM transmitter move in

straight lines and become weak in valleys

between tall buildings, mountains, and

other obstacles. When a vehicle passes

through such an area, the recept ion

conditions may change suddenly, resulting

in annoying noise.

Weak signal noise

In suburban areas, broadcast signals

become weak because of distance from

the transmitter. Reception in such fringe

areas is characterized by sound breakup.

6-16

Interior Comfort

Audio System

MX-5_8CC1-EA-11F_Edition2 Page238

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