The feeder is the signal cable that the early TV and the outdoor antenna are connected to. The line is generally flat and the distance between the two lines is wider. The purpose is to reduce the attenuation of the faint signal between the line distributed capacitance. The line body is insulated plastic. There is no shielding layer outside, and the anti-interference ability is extremely poor. The performance of outdoor use is also affected by the rainy weather.
Antenna and Feeder Maintenance in Wireless Monitoring
a. Antennas and feeders are critical to the normal operation of the system. Common conditions include: 1. The directional antenna is blown by the wind for the communication effect to deteriorate. 2. The feeder enters the moisture, and the attenuation increases, affecting the normal communication. The antenna reflection net is made of wind-damaged parts for ribs, antennas for under-tension and so on. Therefore, the antenna feeder system should be maintained on a regular basis. b. Antenna system maintenance projects and cycles 1. Check antenna tightening once every six months to see if the antenna components are damaged.
2. Replace the waterproof tape between the antenna and the feeder every year.
3. If necessary, adjust the direction of the directional antenna.
4. If you suspect that the feeder has entered moisture, perform the following survey.
I. When the bar-searching and full-antenna connection feeders are all off, the radio power supply connected to the radio is turned off, the connection between the feeder and the combiner is disconnected, and the insulation between the feed line and the outer conductor is measured with a 110V rocker. The situation should be greater than 20MW or more (when severely infiltrated into the water, with a multimeter can also be measured and found to be poor insulation).
II. When surveying the feed line connected to the directional antenna, the above measurement should be performed after the antenna is obsolete, since the directional antenna feed line is connected (the resistance is measured to be zero).
c. When it is found that the feeder has affected the communication due to moisture, it should be disposed of promptly.
The handheld Laser Rangefinder is an instrument that uses lasers to accurately measure the distance to a target. The laser rangefinder emits a laser beam to the target, and the photoelectric element receives the laser beam reflected by the target, and calculates the distance from the emitting point to the target. It can measure distance, area and volume, and can measure both indoors and outdoors.
Some laser rangefinders have horizontal bubbles to improve measurement accuracy. Having a larger LCD screen makes the digital display clearer. You can also customize the prompt sound to prompt the completion of the measurement. The measurement standard can be switched among m/in/ft. The top and bottom of the rangefinder can be selected as measurement standards according to needs. Has the function of storing data. It is convenient and simple to use, and it can be used for single measurement or continuous measurement. It is widely used in interior decoration, construction, industry and other fields.
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