Pajero II Workshop Manual 1991 · Электрооборудование автомобиля · страница 46 из 72 · Открыть оригинал PDF ↗
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A-2Noise appears at certain places when traveling (FM)
NOTE
About FMwaves;
FMwaves have thesameproperties as light, and
canbe deflectedandblockedWavc reception is
not possible in the shadow of obstructions such as
buildingsor mountains
The signal becomes weak as the distance from
the station's transmission antenna increases
Although thismay vary accordingto the signal
strength of the (ransmitting 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 monauralreception
The signal becomesweakwhenanareaof
shadow from the transmitting antenna (places
where there are obstructions such as mountains
orbuildings between the anterina and the car),
andnoisewillappear.<Thisis called first
fading,and givesa steady buzzing noise>
3Ifsame
a direct signal hits theantenna at the
time assignal reflected by obstructions such
as mountainsorbuildings, interferenceofthe
twosignals will generate noiseDuring traveling.
noise will appear each time the vehicles 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 deflec
tion.This is called multipath noise, ad is
repetitious buzzing
Since FM stereo transmission and reception has
a weaker field than monaural,it is often accom-
panied byhissing noise.
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