Radio General Information; Radio Broadcast Signals; Two Types Of Signals; Electrical Disturbance - Jeep Liberty 2008 Owner's Manual

km/h). Refer to "Rear Park Assist System" in Section 3 of
this manual for system function and operating informa-
tion. To make your selection, press and release the
FUNCTION SELECT button until "On" or "Off" appears.
Hill Start Assist (HSA) — If Equipped
When on is selected, the HSA system is active. Refer to
"HSA (Hill Start Assist)" under "Electronic Brake Control
System" in Section 5 of this manual for system function
and operating information. To make your selection, press
and release the FUNCTION SELECT button until "On"
or "Off" appears.

RADIO GENERAL INFORMATION

Radio Broadcast Signals

The radio will provide excellent reception under most
operating conditions. Like any system, however, car
radios have performance limitations, due to mobile op-
eration and natural phenomena, which might lead you to
believe your sound system is malfunctioning. To help
INSTRUMENT PANEL AND CONTROLS 229
you understand and save you concern about these "ap-
parent" malfunctions, you must understand a point or
two about the transmission and reception of radio sig-
nals.

Two Types of Signals

There are two basic types of radio signals: AM (Ampli-
tude Modulation), in which the transmitted sound causes
the amplitude, or height, of the radio waves to vary; and
FM (Frequency Modulation), in which the frequency of
the wave is varied to carry the sound.

Electrical Disturbance

Radio waves may pick up electrical disturbances during
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
carry the FM signal.
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