What are the factors affecting the transmission distance of wireless transmission equipment?
Conveyor Safety Devices,Conveyor Belt Switch,Belt Skid Slip Detector,Conveyor Safety Switch SUZHOU ARPHU INDUSTRIAL CO., LTD , https://www.arphuind.com
With the increasing use of wireless transmission equipment, there are more and more types of wireless transmission equipment on the market. Many merchants use the slogan of high-power wireless transmission equipment to blindly let customers choose wireless transmission products. Transmit power is an important criterion. The general customer believes that the greater the transmission power, the farther the transmission distance of the wireless transmission equipment is, and the better the signal transmission stability is. This is actually a one-sided view.
Transmit power is not an absolute measure of the distance and difference between a wireless device. There are many techniques and techniques in it. Tengyuan Zhituo's 12 years of professional wireless transmission industry experience, sincerely warned the majority of users, whether it is long-distance wireless video transmission or close indoor wireless coverage as long as the normal signal indicators. Too strong or too weak will not work. So what are the determinants of the wireless video transmission signal transmission distance? Let's take a look at it.
1, the transmission environment
The transmission environment mainly includes two aspects:
(1) Geographical environment, if the equipment at both ends of the signal transmission, the terrain environment is open, there is no occlusion in the middle, and the installation position of the equipment is high enough to support the installation drop at both ends, this environment is very ideal. If there is occlusion or shielding, since the high frequency signal does not have good diffraction ability, the transmission distance is not necessarily far.
(2) Electromagnetic environment, in the same environment, if the electromagnetic environment is different in complexity, the transmission distance is also different. The devices in the nearby environment have many interference signals and strong signals, causing electromagnetic interference to the wireless transmission equipment communication. It also causes an unsatisfactory transmission distance. Therefore, choosing a good environment and location, as well as choosing the right channel are prerequisites for transmission.
2. Gain antenna
As the saying goes; good horses are equipped with good saddles, and wireless devices also need good gain antennas to help. After the wireless device modulates the signal into a current signal, it needs to load the current onto the antenna to send the electromagnetic wave to the far end. In this process, the material, workmanship, and technology of the antenna affect the conversion of current. For example, the standing wave ratio of the antenna, the larger the standing wave ratio, the more current returned on the antenna, causing excessive heat generation on the circuit and affecting stability. Therefore, the device with higher power has a large current, so if the low-cost antenna is used, the effective distance of transmission will also be affected.
3. Transmission channel
According to the design of the antenna, some channels will be selected as optimization in a certain channel. This ensures that the device will get better signal strength than other bands when using this segment of the channel. The frequency band optimized by the antenna will have a signal gap of nearly 5~10dbm compared with other channels. Therefore, choosing a good communication frequency band is also an advantage of obtaining better signal strength.
4, receiving sensitivity
The receiving sensitivity refers to the minimum signal receiving power of the antenna port required for the wireless device to work normally. Inter-system interference can cause the sensitivity of the wireless device to drop, affecting the normal reception of the signal. Therefore, the wireless device sensitivity criterion is usually used as the protection criterion of the interfered system. The receiving sensitivity of wireless transmission is similar to human hearing. In everyday environments, the better the hearing, the more agile the ability to capture sound. Similarly, the higher the receiving sensitivity of the wireless device, the stronger the ability to capture weak signals. If the received signal energy is less than its receiving sensitivity, the wireless device will not receive any data. Some wireless transmission equipment manufacturers do not have high signal sensitivity for equipment design. To compensate for this defect, better transmission effects are obtained by increasing the transmission power. But we know that the higher the power of the device, the larger the circuit current. The heat is high, and if the equipment is in a high heat state for a long time, the stability will be correspondingly low.
Tengyuan Zhituo Xiaobian suggested that in the process of using wireless video transmission equipment, the indicators of the wireless transmission system should be maintained in a normal range to ensure long-term and stable operation of the wireless transmission equipment. If the customer does not understand this knowledge, you can also consult a professional wireless equipment manufacturer. Let wireless equipment suppliers provide you with a comprehensive and reasonable wireless monitoring solution.