How to maintain the antenna and feeder in wireless monitoring?

August 09, 2023

An antenna is a transformer that transforms the guided wave propagating on a transmission line into an electromagnetic wave that propagates in an unbounded medium (usually free space) or vice versa. Components used to transmit or receive electromagnetic waves in radio equipment.

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the feed line connected to the directional antenna, the above measurement should be performed after the antenna is obsolete, since the directional antenna feed line is connected (the resistance is measured to be zero).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.

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Author:

Ms. Zoe Zhong

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