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(2) Multipath One signal is reflected off buildings or mountains and the other signal is received directly from the transmitter. Text in Illustration *a Multipath (3) Fade out Fade out is caused by objects (buildings, mountains and between the transmitter and vehicle. High frequency radio waves, such as FM broadcasts, are easily deflected by obstructions. Low frequency radio waves, such as AM broadcasts, are less likely to deflect. Text in Illustration *a Fade Out (d) Noise problem Technicians must have a clear understanding about each customer's noise complaint. Use the following table to diagnose noise problems. RADIO FREQUENCY NOISE OCCURRENCE CONDITION PRESUMABLE CAUSE AM Noise occurs in a specific area Foreign noise Noise occurs when listening to an intermittent broadcast An identical program transmitted from multiple towers can cause noise where the signals overlap Noise occurs only at night Signal phasing FM Noise occurs while driving in a specified area Multipath resulting from a change in FM frequency 6. "HD Radio" FUNCTION OUTLINE (w/ HD Radio Function) (a) The "HD Radio" system is a radio system that broadcasts in the IBOC (In-Band On-Channel) form that the "HD Radio" technology is manufactured under license from iBiquity Digital Corporation. U.S. and Foreign Information for the music currently being listened to is stored in the system and can be transmitted to an "iPod" connected to the system. The information transferred to the "iPod" can be used for purchasing the music through the "iTunes" music store. Also, traffic and weather information can be received and AUDIO / VISUAL: AUDIO AND VISUAL SYSTEM: SYSTEM DES... |