Why does a car radio sometimes have a noise
Click： Time：2017-05-31 17:01:33
Before using your car's stereo system, make sure that the speakers on the inside of the 4 doors of your car speak without sticking any plastic film or being blocked by foreign objects.
1).The FM signal is disturbed. Because the FM signal is similar to the light, but will not turn reflection which is different from the AM signal, can propagate over long distances on the ground plane; so FM radio signal receiving distance AM radio reception distance so far, atmospheric conditions will also affect the reception of FM.
2). Multipass signal noise. Because obstacles can reflex the FM signal, so it's possible to receive direct and reflected signals at the same time, will cause slight receiving delay and could hear staccato or distortion, this phenomenon may occur near the radio station.
3).Jitter / skip noise. Because the FM signal travels in a straight line, the signal becomes weaker when it travels to the valley, between two tall buildings, or meets other obstacles. When cars pass through these areas, they may receive noise.
4). AM station characteristics。 AMSignals will bypass the alpine objects such as buildings and ionosphere launch back to the ground from the air, so AM signal than FM signal emission transmission distance, sometimes may be in the same frequency at the same time listen to the voice of the two radio signals.
5).Strong signal noise. As the car approaches the tower of the station, the signal becomes very strong and may hear noises or break sounds。
6). Weak signal noise. When the car goes to the suburbs, because the distance from the launch station makes the radio signal weaker, there may be a sound interruption, noise and other conditions in these areas.
7). Radio migration noise: when the car near the two frequencies are very close to the strong signal and radio station tower, originally to listen to the radio might temporarily disappear and the second radio listening, at this time due to the interference and there may be some noise。
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