2009 Dodge Journey Owner's Manual - Page 235
2009 Dodge Journey Manual
Page 235 highlights
UNDERSTANDING YOUR INSTRUMENT PANEL 233 CALIBRATE COMPASS Refer to "Manual Compass Calibration" under "Compass Display." 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 operation and natural phenomena, which might lead you to believe your sound system is malfunctioning. To help you understand and save you concern about these "apparent" malfunctions, you must understand a point or two about the transmission and reception of radio signals. Two Types of Signals There are two basic types of radio signals: AM (Amplitude 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. AM Reception AM sound is based on wave amplitude, so AM reception can be disrupted by such things as lightning, power lines and neon signs. 4
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