How to solve radio signal blind area

With the expansion of the scope of radio applications, more and more problems have been found in the use of radio scenes. One of the outstanding problems is the radio signal blind area, which causes great problems for radio users. The radio signal blind area not only appears Stairs not covered by signals, corners of buildings, etc., also include underground parking lots, remote areas. In the signal blind area, we usually cannot receive information, so it is possible to miss important information and work normally. Therefore, many people have been looking for a solution to the radio signal blind area. Before finding a way, we need to understand, what is a radio signal blind area? How did it come about? So that we can find a more effective solution.

what is a radio signal blind area?

The blind area in the usual sense refers to the blind spot of the visual field, and the blind area of the visual field refers to the place where people's sight cannot reach. Similarly, radio signal blind area refer to places where radio electromagnetic waves cannot reach. In the blind area, the radio signal is very weak, or even no radio signal, which affect the communication between the radio and other devices, resulting in no way for the information to be effectively transmitted.

How did radio signal blind area come about?

There are many reasons for forming a communication blind area . First, it is the cause of the radio itself. Taking the most common radio communication as an example, the current commercial radio communication is basically microwave communication with a frequency between 400MHz and 470Mhz. Microwave communication has a short propagation distance. Therefore, it is difficult to cover a large area. Taking a 10W handheld radio as an example, in an ordinary urban area, the signal coverage is about 5km. If the buildings are dense, the signal coverage will be smaller. Therefore, the generation of signal blind spots has a great relationship with the configuration of the radio itself. The better the configuration, the smaller the probability of blind spots. The lower the configuration, the greater the probability of blind spots.

Second, the environment in which the radio is used. The open sea level, noisy streets, old buildings, different use scenarios, and the generation of signal blind area are also different. The more factors that affect the signal in the environment, the easier it is to produce signal blind spots. For example, hotels and modern hotels are much better than the previous teacher buildings because of the materials used for decoration and the thickness of the walls of the decoration, so if you use the same radio equipment , Old buildings and famous products have a greater probability of generating signal blind area .

How to solve signal blind area?

Without changing the environment in which it is used, the most common way to solve the blind area of radio signals is to use relays. The addition of the relay can double the coverage of the radio signal. Take the Retevis GMRS radio solution as an example. If you only use a handheld radio, the call distance is about 2.7km. However, the use of the RT97 mini-relay makes the entire program call The distance reaches 18km, and the expansion of the communication distance means that there will be fewer blind spots for preference.

The other is to upgrade the existing equipment, such as using a better antenna or installing the antenna at a higher position. The quality of the antenna and the height of the installation directly affect the signal coverage.

Another way is to upgrade the host, that is, to replace the radio with a better power configuration. For example, the original 2W machine can be upgraded to a 5W host, and the 5W host is upgraded to 10W. These have a great effect on solving signal blind spots.

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