Transmission distance has long been an important factor limiting the development of the wireless surveillance industry. However, with the continuous advancement of wireless technology in recent years, long-distance wireless monitoring has gradually entered people's field of vision and has been applied by many industries. In the long-range wireless monitoring solution, if you want to monitor the device to give full play to its performance advantages, there are many tips and precautions that must be known before the installation.
First, choose the right long-range wireless monitoring equipment:
1. Select a suitable long-distance wireless monitoring device according to environmental requirements. The reference factors include the working frequency band, transmission distance, antenna gain, etc. of the device;
2. Select the appropriate networking solution, point-to-point networking, relay networking or point-to-multipoint networking. The specific solution can consult the equipment manufacturer to design a reasonable plan before purchasing the equipment;
3. Depending on the electromagnetic interference environment at the installation site, it is generally recommended to select a 5.8G long-distance wireless bridge for long-distance outdoor long-distance wireless monitoring;
4. Wireless bridge devices must be paired with the same model. Different models can be used in the same network, but they are not necessarily compatible with other brands.
Second, the choice of installation location:
1, the installation height
In the process of wireless transmission of long-distance wireless bridges, obstacles such as trees, buildings and large steel buildings will weaken the blocking of wireless signals. In order to improve the wireless transmission performance and prevent the signal from being damaged and the signal is weak, the user should try to ensure that there is no obstruction in the transmission route of the long-distance wireless bridge, and the transmission conditions of the two ends can be seen.
The two ends can not be simply understood as point-to-point visual, which means that there can be no obstacles or potential obstacles in the Fresnel zone (radio wave terminology) where the antenna propagates. The elliptical area in the above figure is simply understood as the Fresnel zone, ensuring that there are no obstacles in this area. The primary RF energy between the antennas is transmitted in this area, so the transmitting antenna must be above the obstacle at a sufficient height to maintain a line of sight between it and the receiving antenna to ensure that the communication link is working properly.
2, angle and signal debugging
Since the signal of the long-distance wireless monitoring device is directly related to the bandwidth and stability of the link, further debugging of the signal of the remote wireless monitoring device must be performed after the installation is completed (the adjustment can be achieved by adjusting the direction of the antennas on both sides, the elevation angle, etc.) The purpose of signal strength). The signal strength status can be viewed based on the signal status indicator or software of the wireless monitoring device.
Third, equipment installation method
The specific installation method of the long-distance wireless monitoring equipment can be operated according to the instructions of the purchased equipment.
1, installation notes:
1 When the pole is installed, the selected pole should not be too thin or too thick to ensure that the standard cable tie can be installed directly;
2 equipment away from metal objects / disadvantages. (eg heating, air conditioning pipes, large ceiling frames, building superstructures, and main power lines);
3 equipment should be installed to ensure that it is secure and not loose;
4 If the wireless monitoring device is an external antenna, the connection of the device must be secure;
5 When connecting the network port of the device, you need to strictly follow the installation instructions of the bridge. If the operation of the network port is improper, the interface will be burned out or the circuit board will be short-circuited, which may cause the device to fail to work normally.
6 The network cable should not be bent or knotted, nor should it be too close to the strong circuit line, otherwise it will affect the transmission. For outdoor construction, the outdoor type network cable should be selected to prevent the insulation sheet from aging;
2. Installation requirements for lightning protection in the field of bridges:
When installing long-distance wireless monitoring equipment in the field, if there are no tall buildings or lightning rod protection nearby, lightning protection measures should be considered. Lightning rods are usually used. Generally, when lightning protection is installed in the urban area or surrounded by lightning rods, lightning rods may not be separately installed. When installing the equipment, try to use the POE lightning protection module. However, the lightning protection module is used to prevent damage to long-distance wireless monitoring equipment such as static electricity, surges, and AC lightning, and cannot prevent direct lightning strikes.
3. Power supply requirements:
The normal power supply voltage of the PoE power supply module of the wireless monitoring device is 110V~240V. If the voltage is lower or higher, the device will work normally or the PoE power supply module may be damaged. In view of the unstable power supply voltage and high voltage in the field, it is necessary to design a PoE power supply solution (such as regulated power supply and UPS power supply) that can adapt to the working voltage. When using the PoE module to power the device through the network cable, the recommended distance is no more than 100 meters.
4. Equipment grounding requirements:
The long-distance wireless bridge should be grounded. If the equipment is not grounded, it will cause abnormal operation and damage. The grounding resistance of the equipment should be less than 4 ohms, and it should not be grounded with lightning rods and high-voltage lines. Grounding is also required if a PoE power ground is used. Users can connect to the PoE adapter with a grounded Category 5 (or above) shielded network cable for grounding, which can easily and effectively prevent static electricity and lightning strikes.
The above is the problem that should be paid attention to when setting up a long-distance wireless monitoring system. If you need more details, you can also consult Tengyuan Zhituo. We have 13 years of experience in the wireless monitoring industry and will provide you with more professional knowledge.
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