Audio System Description; Radio Wave Band; Service Area; Reception Problems - Toyota Celica 2000 Repair Manual

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AUDIO SYSTEM

radio wave bands used in radio broadcasting are as follows:

---- � --- -

LF: Lo w frequency MF: Medium Frequency HF: High Frequency VHF: Very High Frequency

BODY ELECTRICAl - AUDIO SYSTEM

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There are great differences in the size of the service area for AM

and FM monaural. Sometimes FM stereo broadcasts cannot be

received even through AM comes in very clearly.

Not only does FM stereo have the smallest service area, but it

also picks up static and other types of interference ("noise")

Besides the problem of static, there are also the problems

called "fading", "rnultipath" and "fade out". These problems are

caused not by electrical noise but by the nature of the radio

waves themselves.

Besides electrical interference, AM broadcasts are

also susceptible to other types of interference, es

pecially at night. This is because AM radio waves

bounce off the ionosphere at

with the signals from the same

transmitter that reach the vehicle's antenna directly.

This type of interference is called "fading".

Frequency modulation

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