How to improve the transmission distance and signal quality of the wireless microphone?
The convenience of wireless microphones is obvious to all, in addition to stage performances, it is also widely used in KTV, conference rooms and other occasions. However, some people think that wireless microphones are not as stable as wired microphones and have limited transmission distances. In fact, this is not the case. The current microphone technology is already very advanced in terms of stability and has its know-how in improving transmission distance and signal quality.
1. The antenna determines the actual receiving distance and quality of the receiver
The wireless transmission distance is mainly determined by the power of the transmitter and the sensitivity of the receiver. Directly increasing the transmission power or receiving sensitivity can increase the use distance and signal quality, but the user cannot change the specifications of the two after leaving the factory, especially In addition to the limitation of radio wave regulations, the lack of mutual interference between multi-channel signals will be more serious. The power consumption of the product will increase, and the using time will be greatly shortened. Of course, this is not the best policy.
The additional way is to improve receiver sensitivity. In theory, when the sensitivity is increased by 6dB, the receiving distance can be doubled, but in fact, it is not easy for the user to change the original sensitivity of the receiver arbitrarily. Because in actual application, the transmitted signal is received through the antenna of the receiver, so the only way for users to improve the overall system transmission effect is to improve the characteristics and installation of the receiving antenna!
2. Introduction to antenna characteristic specifications
In the wireless microphone system, the wireless signal of the microphone is transmitted to the air by the transmitting antenna, and then the signal is collected by the receiving antenna and transmitted to the receiver. It can be seen that the antenna is a window for transmitting and receiving wireless signals. The function of the antenna is very important. It is recommended to choose a receiver with a detachable antenna, so that users can choose different types of antennas to install according to the actual needs of the use, in order to achieve the best reception.
When choosing an antenna, the characteristics to consider are as follows
The difference between Omni-directional and directional antennas. The standard Omni-directional antenna has a receiving angle of 360 degrees. There is no need to adjust the angle of the antenna device during use. The directional antenna uses the 3 dB beamwidth as an indicator. That is the angular range and directivity of the antenna gain attenuated by 3 dB from the maximum value. The user can choose according to the application environment. For example, when there is no specific direction between the microphone and the receiver, and the use environment is close range, The Omni-directional antenna can be selected; it is used on a professional stage at a long distance or in a specific direction. Usually, a directional antenna is selected to obtain better-received signal quality and avoid interference signals in other directions.
3. The receiver is equipped with the correct antenna system to obtain the best transmission effect.
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As for the power supply of the strong wave device, it can be directly supplied by a receiver having an antenna bias output. When used in a long-distance environment with many interference signals, a wideband dual-power directional antenna is used, which is fixed vertically with a stand to point the antenna in the direction used by the wireless microphone. Because the antenna has directivity and provides high gain, Better reception.