1, if the wireless microphone is transmitted and received by the battery, when the battery voltage is seriously low, the frequency drift is serious, and the working frequency is deviated from the working frequency, and the noise like the tide is generated. Try replacing the battery.
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2, the transmitting and receiving distance is too far, beyond the working range. Try it closer.
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3. The antenna falls off or the telescopic antenna is not pulled out. Check and try changing the direction.
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4, if there are more than two wireless microphones, maybe take the cross. The receiving and transmitting frequencies are paired. There can be no mistake.
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5, the above checks are no problem, check the receiver, there is generally a small hole, like a copper screw, with a flattened dry bamboo sheet or plastic sheet fine-tuning try. Fine-tuning while talking into the microphone, slowly rotate the fine-tuning capacitor left and right, to find the most clear point.