2007 Chrysler 300 Owner Manual - Page 187

UNDERSTANDING YOUR INSTRUMENT PANEL 187 RADIO GENERAL INFORMATION Radio Broadcast Signals Your new 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 or Amplitude Modulation, in which the transmitted sound causes the amplitude, or height, of the radio waves to vary...and FM or Frequency Modulation, in which the frequency of the wave is varied to carry the sound. Electrical Disturbances 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. FM Reception Because FM transmission is based on frequency variations, interference that consists of amplitude variations can be filtered out, leaving the reception relatively clear, which is the major feature of FM radio. NOTE: For vehicles not equipped with the Electronic Vehicle Information Center (EVIC), the radio, steering wheel radio controls (if equipped), and 6 disc CD/DVD changer (if equipped) will remain active for 10 minutes after the ignition switch is turned off. Opening either front door will cancel this feature. NOTE: For vehicles equipped with the Electronic Vehicle Information Center (EVIC), the radio, steering wheel radio controls (if equipped), and 6 disc CD/DVD 4