1989-Montero · Аудиосистема · страница 4 из 30 · Открыть оригинал PDF ↗
NOTE
About FM waves:
FM waves have the same properties as light, and
can be deflected and blocked. Wave reception is
not possible in the shadow of obstructions such as
buildings or mountains.
The signal becomes weak as the distance from the
station’s transmission antenna increases.
Although this may vary according to the signal
strength of the transmitting station and intervening
geographical formations or buildings, the area of
good reception is approx. 20-25 km (12-16
miles) for stereo reception, and 30-40 km (19-25
miles) for monaural reception.
If a direct signal hits the antenna atthe same time
as a signal reflected by obstructions such as moun-
tains or buildings, interference of the two signals
will generate noise. During traveling, noise will ap-
pear each time the vehicle’s antenna passes
through this kind of obstructed area. The strength
and interval of the noise varies according to the
signal strength and the conditions of deflection.
<This is called multipath noise, and is a repetitious
buzzing.>
Since FM stereo transmission and reception has a
weaker field than monaural, it is often accompa-
nied by a hissing noise.
The signal becomes weak when an area of
shadow from the transmitting antenna (places
where there are obstructions such as mountains or
buildings between the antenna and the car), and
noise will appear. <This is called first fading, and
gives a steady buzzing noise.>
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