1, the negative end of the 9V wireless microphone seat is wound with a enameled wire into a dense spiral, and is fixed on the opposite side of the tail tongue plate of the wireless microphone, the V section is longer (diameter 2.5MM around the head and then back to the starting point), and the U section is shorter (diameter 4MM around the head).
    
2, just connect the negative terminal of the 9V battery with the battery housing, so that the wireless microphone transmitting antenna is extended through the battery housing, you can increase the transmitting distance, prevent frequency band and frequency running.
    
3, open the wireless microphone hands-on ability. From the tail out of 2 inches long, exposed half an inch of multiple circuit boards, find the location of the transmitter tube, with 1 P capacitor (or several capacitors and minimum capacitors) welded with a enamelled wire wound into a dense spiral, fixed in the tail of the wireless microphone, helix diameter less than the width of the slot, flattened fixed in the slot, with 5 capacitors and minimum capacitors) fixed in the slot, fixed with the battery shell.
    
4, if the frequency band is staggered. In this process, open the crosstalk receiver cover so that the antenna leadin line is far away from the inductor and midcycle line, etc., and the antenna signal cannot be directly seried into the inductor and midcycle (producing secondary tuning). Maybe it has some effect, you can try it.
    
Sometimes the frequencies are staggered and useless. Use multiple radio stations in the same place. Having two frequencies creates a third frequency, like throwing two rocks in a river, and two waves interfere to create a third wave. Because the two waves have similar frequencies, the third wave is also close to him, and the third wave will interfere with their uncle. Generally speaking, the factory will avoid this situation in advance, but there are inevitable. Therefore, it is also necessary to practice to understand that these frequency points can live in harmony with each other.
    
6. When purchasing VHF or UHF microphones, the frequency is usually staggered by at least 25 KHz.
    
The antenna length is inversely proportional to the frequency, and the wavelength is short when the frequency is high, and the antenna is short.
    
The antenna extraction point can be selected: 1. The negative end of the battery, 2. It can also be the emitter of the transmitter tube, the emitter of all the transmitting circuit should be connected with a minimum capacitance (1 P or a few P), and the method of finding capacitance can be used at the same time to determine the extraction point and the emitter of the battery with No. 5, the transmitter has used the minimum capacitance (1 P or a few P).
    
9, mainly depends on how many you open at the same time, because a good MIC can only do a maximum of 20 in the same series without interference, but the price is outrageously expensive. There are more private rooms, each frequency band can be separated, and there may be about 100 units at most, which should be enough. Choose shure or sennheiser, only mipro is slightly cheaper. Many manufacturers say that their MIC has 200 or more frequencies, you can ask him to open 200 at a time can it be used? No, of course not. Two at the same time will actually produce four frequencies, so there can only be a dozen inconsistencies in 200 bands at most.
    
10, the fewer the number of wireless microphones used, the better.
    
Some brands of microphones have better effects with talent, some serious frequency escape alone, away from a lot of other microphones and close to the actor do not escape frequency.
    
12, over a period of time to select a serious frequency of the microphone to choose another frequency change, the same brand can not use too much.
    
13, there is also a special effect method, you can choose: [Weld a wire to the negative end of the battery holder in the handheld wireless microphone, pass through the solder joint surface of the circuit board, connect to the fixed metal helix of the microphone head, and add a few P capacitors in the middle for straightenness. At a linear distance of more than 150 meters, make its metal body and metal mesh cover also become transmitting antennas, which can make its working radius exceed 150 meters.
    
14. Invisible antenna designed for handheld wireless microphone:
(1. Radiate outwards using the head mesh cover.
(2) Radiate outward with No. 5 battery housing. Unscrew the mesh cover, remove the head, and then unscrew the metal screw fixing ring to see a contact point or contact ring, which is the extraction point of the antenna. Many frequency breaks, running frequency failures, are because this point is not in contact with the metal screw fixed ring and mesh cover. The radiation wave is extracted by the antenna, which can effectively prevent harmonic interference and make the frequency more accurate and effective. For example, a spiral antenna is added to the tail of a handheld wireless microphone, and its half longitude can reach more than 150 meters.
    
15, if the working frequency parameters of the wireless microphone have slightly changed, it is not recommended to adjust the launch plate of the handheld (collar clip) wireless microphone during maintenance. If the transmitter board is contaminated by solution, resulting in high-frequency leakage, and can only be repaired with anhydrous alcohol wash, it is recommended to adjust only the receiving circuit board of the wireless microphone.
    
Open the launch box cover, find the launch point, the triode next to the minimum capacitor is the transmitter tube, its side inductor pin is connected with a wire, the shell and the head microphone or lead cereal parallel to the microphone head, and install an antenna socket next to the launch box. It can reach an effective distance of 300-500 meters, and can effectively eliminate movement frequency and segment frequency.