The environment in which the wireless microphone itself is used requires the wireless microphone receiver to be visible to a person.
My personal experience of doing engineering alone has encountered many problems. In the primary or kindergarten, their computer room is in a remote indoor corner. The wireless microphone receiver is also placed in the cabinet in this corner, and the playground is on the outdoor campus. Inside, the teacher's speech is outside, so that when the teacher speaks, there will be a frequency break, that is, the speech will be intermittent, affecting the normal use.
The fault phenomenon that I have appeared in the actual project: The whole system is well debugged during the summer vacation, and the speech is normal. However, there is a problem at the opening ceremony on September 1st. The speech is intermittent.

The main reason:
1. The signal is interfered by the surrounding electric wave
2. Rainy day absorbs wireless signals
3. Because a large number of people gather together, the human body also absorbs a lot of radio waves.

In response to the above faults, the author summarizes the reliable solution to solve: 1. Move the host out to the outside, the range visible to the speaker 2. Increase the wireless microphone antenna amplification system 3. The wireless microphone antenna adds an extension cable to the outside.
If the host moves out of the room, there will be a problem. The output of the host must be balanced to the preamplifier or mixer of the equipment room. This will result in a long distance potential difference and the horn will be loud. At this time, the author developed a noise impedance matcher that can completely solve it.

Pay attention to the position of the antenna when adding the system. This is very important. If the position is not correct, it will be self-defeating.
The antenna extension cable has certain limitations, and the farthest distance cannot exceed 10 meters. Otherwise, the distance is too long and the energy of the radio wave is lost.