2005 Chrysler 300 Owner's Manual - Page 192

192 UNDERSTANDING YOUR INSTRUMENT PANEL 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: On vehicles so equipped the radio, steering wheel radio controls and 6 disc CD/DVD changer if equipped, will remain active for 10 minutes after the ignition has been turned off, and the driver door has not been opened. This feature is programmable through the electronic vehicle information center (EVIC) - if equipped. Refer to "Delay Power Off to Accessories Until Exit" under "Personal Settings" in the Electronic Vehicle Information Center section for details. CASSETTE TAPE AND PLAYER MAINTENANCE To keep the cassette tapes and player in good condition, take the following precautions: 1. Do not use cassette tapes longer than C-90; otherwise, sound quality and tape durability will be greatly diminished. 2. Keep the cassette tape in its case to protect from slackness and dust when it is not in use. 3. Keep the cassette tape away from direct sunlight, heat and magnetic fields such as the radio speakers.