Our ancestors still lived in the countryside and the countryside, when technology was not developed enough, to go out by walking, something by Shouting. At that time, if there was something in the village that needed to be notified, it was basically a door-to-door notification.
Then, technology developed, and you had outdoor radio, a studio in a fixed location in town, with speakers and microphones, and you could shout announcements. But the sound waves emitted by the loudspeaker are still not heard at a distance.
Rural broadcasting
Then someone put a few more speakers in different places to achieve the effect of notification. Outdoor broadcasting systems have developed rapidly over time.
Gradually, some people have the demand for outdoor public address systems in residential areas, parks, scenic spots, villas, outdoor sports venues, etc.
With the rapid development of science and technology, users have higher and higher requirements for the application of new technology. It is more important to provide technology and new products that meet the needs of customers. The public address system in the conventional sense can not meet the needs of users and the growth of sales in many aspects. The digital public broadcasting system has become the mainstream of today's broadcasting development. The digital public broadcasting system makes full use of digital technology, making the user's operation more intuitive, easier, the system configuration more flexible and the complete function stronger. Therefore, it is necessary to digitize the outdoor public address system, which can solve the problems that can not be solved by the public address system in the past more directly, less labor and more conveniently.
Today we talk about the outdoor broadcast system needed for the scene. As we all know, a large project a large construction site basically covers an area of tens of thousands of acres, in such a huge construction area, management difficulties, workers planning operations, helmet matching, illegal foreign personnel break into the hidden dangers of equipment and so on. At this time, the project manager needs to yell at the construction personnel at any time to deal with and correct the existing problems in a timely manner. Usually shout with the voice, has not been able to solve the requirements of the project manager, but also because of often Shouting, injured vocal cords, etc., need to have a wireless microphone to assist in Shouting. Usually we come into contact with wireless microphones, most of them are the kind of close microphone sung in KTV. For the site obviously can not meet the requirements.
The radio transmission distance mainly depends on the power of the transmitting end and the sensitivity of the receiving end, if directly improve the transmitting power or receiving sensitivity, will increase the use distance and signal quality, but the specifications of the two after the factory, the user can not arbitrarily change, especially to improve the transmitting power, in addition to the restrictions of the radio wave regulations, The loss of transmission power or receiving sensitivity will be more serious, and the power consumption quality and quality of the product itself will be greatly shortened, especially when increasing the transmission power, the transmission power can not be changed at will.
In addition, the receiver sensitivity is improved, the theoretical sensitivity is increased by 6 dB, and the receiving distance can be increased by twice, but the user will not change the initial sensitivity of the receiver at will. In practical applications, since the wireless microphone system receives signals from the antenna sent to the receiver by the device, the only means for users to improve the transmission effect of the entire system is to improve the characteristics and specifications of the receiving antenna and the installation project!
To receive at a distance, in addition to the professional machine with pure automatic communication for the receiver, special attention should be paid to the installation of the antenna system. The antenna adopts an all-pointing external antenna, the antenna is mounted high or upside down on the ceiling, and the coaxial cable is directly connected to the receiver antenna input socket, which can improve the receiving distance and receiving quality. Because the higher the receiving antenna frame is from the ground, the farther the receiving distance is, but the coaxial cable will produce signal transmission loss, so the cable line with less loss must be selected according to the use of distance to compensate for the cable transmission loss.
For the strong wave power supply, it can be directly supplied by the receiving antenna base of the antenna bias output. When the multi-interference signal is used at a distance, the wideband dual-power directional antenna is used, and the tripod is fixed vertically to the ground, so that the antenna points to the direction used by the wireless microphone, because the antenna has directivity and high gain, better receiving effect can be obtained.
Using circular polarization broadband dual power direction in the same environment can eliminate the instantaneous signal fading phenomenon caused by the change of receiving and transmitting antenna angles, so as to obtain more stable signal reception quality.
The combination of an antenna and a wireless microphone can achieve a perfect combination, real-time on-site for the project manager to bring convenience.