The same is the difference between the transmission distance of the long-distance WiFi module and the wireless microwave. In the application of the long-distance WiFi module, have you encountered such a problem? Obviously, the one you bought can transmit 20 kilometers of wireless, but can only transmit 10 kilometer? In fact, there is a reason for this problem, and today we will learn about the factors that affect the transmission distance of long-distance WiFi modules.
1. The quality of the wireless module itself
There are many factors that affect the quality of the long-distance WiFi module itself, such as radio frequency circuit, transmit power, and receive sensitivity. From the level, it can be divided into civil level. Industrial and military grades, the corresponding prices are also different. Therefore, the transmission distance will also vary.
2. The influence of the barrier
Long-distance WiFi modules are mainly used in outdoor environments. In some complex outdoor environments with many obstacles (such as trees, buildings, mountains, etc.), the signal of the wireless network will be affected by the obstacles, weakened or even blocked. At this time, you can use both ends to be elevated or add repeaters to avoid obstacles.
3. Environmental impact
The transmission distance of the long-distance WiFi module also depends on the specific environment of use. Generally speaking, when the environment and weather are relatively good, the transmission distance will be more ideal. In some harsh environments, although the configuration of the wireless itself has the functions of waterproof, sun protection, explosion-proof, high and low temperature, the transmission distance will inevitably be affected. The specific situation depends on the specific usage environment.
4. Antenna influence
The antenna can be understood as the transmit power of the long-distance WiFi module. Generally speaking, a pair of 12dbi directional antennas can achieve 2km point-to-point interconnection, while 27dbi directional antennas can achieve 10km point-to-point interconnection. It can be seen that the greater the power, the longer the transmission distance. Of course, in addition, the raw materials and process flow of the manufacturer's antenna are also important factors that affect the antenna gain.
If the above problems do not exist, then you may really be deceived by the exaggerated propaganda of the long-distance WiFi module manufacturers. Although most wireless network module manufacturers in the market are very professional, it is not ruled out that some black-hearted manufacturers are in order to reduce costs and reduce construction troubles , recommending customers with poor quality equipment and non-conforming environmental control schemes, which will definitely greatly reduce the use effect of the wireless network bridge.
What is the difference between a wireless bridge and a wireless microwave? Wireless microwave transmission is divided into analog microwave transmission and digital microwave transmission. Its frequency range is between 300mHz and 300gHz; the wireless bridge is divided into two frequency bands: circuit bridge and data bridge 2.4G and 5.8G two frequency bands, which work between 2312~2732mHz and 4920-6085mHz respectively.
Therefore, we can see that the wireless bridge is also in the microwave frequency range. The wireless microwave includes the frequency of the wireless bridge, that is, the wireless bridge also transmits through the wireless microwave.
So what's the difference between them? Let's go into details.
1. Different frequencies. The frequency of the wireless bridge is 2.4G and 5.8G, while the microwave frequency range is very wide, between 300mHz~300gHz.
2. Different transmission distances. Due to the low frequency of wireless bridges, the transmission distance is short, generally from 1 to 10 kilometers; the microwave frequency is wide, and the transmission distance is very long, up to tens of kilometers to 100 kilometers.
3. Different diffraction functions, the diffraction function of bridge transmission is stronger, while the diffraction function of microwave transmission is basically not, because the higher the diffraction frequency, the weaker it is. Diffraction is diffraction, which refers to the physical phenomenon that a wave deviates from the original straight line when it encounters an obstacle. When a bridge transmits, the wireless signal bends when it encounters obstacles. For example, if you put a wireless bridge in one room, you can get the signal in another room, it's just attenuated.
4. Different functions, wireless bridges can not only be used for wireless applications, but also transmit video, audio and data signals, while microwave transmission can only transmit video, audio and data signals and cannot be used for applications.
