The following factors can be considered as possible causes of noise appearing at night.
  1. Factors due to signal conditions: Due to the fact that long-distance signals are more easily received at night, even stations that are received without problem during the day may experience interference in a general worsening of reception conditions. The weaker a station is the more susceptible it is to interference, and a change to different station or the appearance of a beating sound* may occur.
  2. NOTE: Beat sound*: Two signals close in frequency interfere with each other, creating a repetitious high-pitched sound. This sound is generated not only by sound signals but electrical waves as well.
  1. Factors due to vehicles noise: Alternator noise may be a cause.
DIAGNOSIS PROCEDURE
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