UNDERSTANDINGYOURINSTRUMENTPANEL
185
TwoTypesofSignals
FMReception
There are two basic types of radio signals... AM or
AmplitudeModulation,inwhichthetransmittedsound
causes the amplitude, or height, of the radio waves to
vary... and FM or Frequency Modulation, in which the
frequencyofthewaveisvariedtocarrythesound.
Because FM transmission is based on frequency varia-
tions, interference that consists of amplitude variations
canbefilteredout,leavingthereceptionrelativelyclear,
whichisthemajorfeatureofFMradio.
NOTE:
On vehicles so equipped the radio, steering
ElectricalDisturbances
wheel radio controls and 6 disc CD/DVD changer will 4
remain active for up to 45 seconds after the ignition
switchhasbeenturnedoff.Openingavehiclefrontdoor
willcancelthisfeature.
Radiowavesmaypickupelectricaldisturbancesduring
transmission. They mainly affect the wave amplitude,
and thus remain a part of the AM reception. They
interfere very little with the frequency variations that
carrytheFMsignal.
AMReception
AMsoundisbasedonwaveamplitude,soAMreception
canbedisruptedbysuchthingsaslightning,powerlines
andneonsigns.
| Categories | Jeep Grand Cherokee Manuals, Jeep Manuals |
|---|---|
| Model Year | 2005 |
| Download File |
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| Document File Type | |
| Copyright | Attribution Non-commercial |
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