With the continuous development of wireless technology, wireless monitoring equipment has been recognized by customers in the security industry and is used more and more widely in the industry. Wireless signals can be seen everywhere. The more wireless signals are used, the greater the possibility of co-channel interference. No matter how the equipment is improved, it will not be able to avoid interference from buildings and interference from similar devices. But we can think of ways to circumvent these two major interferences. The following Feng Runda technology will introduce how wireless monitoring devices avoid two major interferences:
1, the interference of the building
When the wireless signal encounters the obstruction of the object in the process of transmission, if the signal transmission distance is not far, there is an occlusion environment in which the transmission direction is changed by the way of refraction, and the signal reflection and attenuation will be caused. . Although the signal can be received, the signal strength of the received signal is very weak, and the bandwidth is also attenuated greatly.
If you encounter a metal object in the transmission, it will increase the attenuation of the signal. If there is blocking transmission in the case of transmitting video signals, then the signal stability is certainly difficult to guarantee. The transmission network signal does not require much bandwidth. Therefore, the transmission of network signals in an occluded environment can still meet the requirements.
Therefore, when selecting the installation location of the wireless monitoring equipment, it is possible to achieve as much as possible in the middle and be visible from the middle of the transmitter to the receiver, thus avoiding the attenuation of microwave signals, and the monitoring center can receive high-intensity wireless signals, thereby improving Monitor effect. If there is blockage between the transmitting end and the receiving end, we can avoid the middle shield by relaying.
2. Interference from similar devices
In the wireless monitoring system, the analog wireless monitoring system is a fool-proof system. When encountering the interference source, we can only slowly investigate, and the digital wireless monitoring equipment belongs to the intelligent wireless monitoring system. We can only scan through the software. Near the same frequency, so set it to avoid the frequency.
At present, wireless monitoring devices are everywhere we see. Mobile, China Unicom towers, walkie-talkies, wireless phones, and so on are all transmitted using wireless signals. Certainly, wireless monitoring devices also have interference. For digital wireless monitoring equipment to avoid the surrounding similar equipment, or signal interference with the role of equipment. The signal source of this interference signal may be a normal signal source in our system, and may be due to the same frequency or similar, resulting in the receiving terminal receiving no or receiving the same signal, making the receiving terminal difficult to identify.
For this situation, we can adjust the frequency of the wireless device, select a clean channel, or change the position of the wireless device transmitter or receiver, and pull the distance between the devices.
For consultation on wireless bridge equipment and solutions (difficult questions), contact Feng Runda Huang Gong
Perilla Seed Oil
Before talking about perilla seed oil, let`s talk about perilla first. Many people don`t know what perilla is when they mention it. If I mention another name, I think everyone will know it - perilla, which everyone usually likes. Wrap the barbecued meat with perilla leaves and eat it. It is refreshing and relieves greasiness, and it also has the unique fragrance of perilla. There are many names for perilla, and each region has its own name: white perilla, red perilla, red perilla, fragrant perilla, etc. This is a plant that matures in one year and is used in medicine, health products and food. It has a wide range of uses. Perilla was one of the first batch of 60 plants announced by the former Ministry of Health as both food and medicine. Perilla began to be eaten by everyone as early as more than 2,000 years ago, and it is recorded in "Compendium of Materia Medica" and "Qi Min Yao Shu".
Perilla seed oil is obtained by pressing perilla seeds, and the oil content of perilla seeds is about 30~40%. According to the data measured by the Testing Center of Northwest A&F University, the composition and content of perilla seeds are: fat 45.03%, protein 21.05%, crude fiber 19.74%, non-nitrogen substances 9.65%, and ash 4.53%. It has the highest fat content. Among the fatty acids in perilla seed oil, the a-linolenic acid content reaches 61.2%, linoleic acid is 9.4%, oleic acid is 21%, and the unsaturated fatty acid content is 91.6%. The highest a-linolenic acid content among the 55 plants containing a-linolenic acid (>30%), its perilla content ranks among the best.
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