BODY ELECTRICAL SYSTEM – AUDIO SYSTEM AUDIO SYSTEM SYSTEM DESCRIPTION 1. RADIO WAVE BAND The radio wave bands used in radio broadcasting are as follows: Frequency 30 kHz 300kHz 3 MHz 30 MHz 300 MHz Designation LF MF HF VHF Radio wave AM FM Modulation method Amplitude modulation Frequency modulation LF: low Frequency MF: Medium Frequency HF: High Frequency VHF: Very High Frequency 2. SERVICE AREA There are great differences in the size of the service area for AM, FM monaural, and FM stereo broadcasts cannot be received even though AM comes in very clearly. Not only does FM stereo have the smallest service area, but it also picks up static and other types of interference ("noise") easily. FM (Stereo) FM (Monaural) AM BE2818