The dead point is also called the dead zone. During the movement of the wireless microphone, the signal received by the receiver may have a strong or weak change due to the difference in distance, relative position or obstacle. In some locations within the normal range of use, a weak signal will cause the squelch circuit in the receiver to operate, cutting off the output signal; and leaving the position, it will normally receive and output. This location is called a dead or dead zone.
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