2008 Dodge Grand Caravan Owner Manual - Page 253

UNDERSTANDING YOUR INSTRUMENT PANEL 251 Rear Park Assist System - If Equipped When ENABLE is selected, the Rear Park Assist System is activated. When DISABLE is selected, the System is deactivated and, the instrument cluster will display the ЉPARK ASSIST DISABLEDЉ message. Display Units of Measure in The EVIC, odometer, and navigation system (if equipped) can be changed between English and Metric units of measure. To make your selection, press and release the RESET button until US or METRIC appears. RADIO GENERAL INFORMATION RADIO BROADCAST SIGNALS Your 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: 1. AM or Amplitude Modulation, in which the transmitted sound causes the amplitude, or height, of the radio waves to vary. 2. FM or Frequency Modulation, in which the frequency of the wave is varied to carry the sound. 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