For the interference of the above two kinds of microwave signals, the following methods can be used to overcome or reduce the interference:
1. Look for the shielding position to find the position where the interference wave cannot interfere or the interference is small, that is, the interference dead angle. Both the interference wave and the satellite wave are straight waves, and they will be reflected when they encounter obstacles on the way. The difference between the two types of radio waves is that the field of the signal jammer wave is tens of millions of times stronger than the satellite wave, causing obstacles and buildings to be encountered. Later, it will be reflected everywhere, and the satellite wave will be easily absorbed by the ground if it is not reflected by the antenna. The easiest way to find the shielding position is to lower the height of the antenna and use surrounding natural objects to avoid strong microwave interference signals. For example, putting it in the yard is better than putting it on the roof; you can also dig a side length on the ground. The depth of the 2m×2m deep pit can be controlled according to the situation. The principle is that the deeper the better, but pay attention to the front of the antenna (direct south) not to be blocked by soil. Place the antenna at the bottom of the pit, that is, when the antenna is receiving signals Can not be blocked by the height of the pit: the antenna can also be moved to the other side of the building, and the building can be used to block the interference source from that direction.
2. Install anti-interference device
The satellite interference signal comes from the ground, and the satellite signal comes from the sky. As long as the ground satellite interference signal is shielded, it is OK. Use iron sheet or barbed wire to make a fence for the satellite antenna, which does not block the satellite signal but can block the interference signal, which can avoid interference. Determine the source of the interference wave, and set up a metal plate (net) on one or more sides of the antenna to block the interference wave. The height of the metal plate (net) must exceed the tuner, and it must not block the path of the satellite signal. Since the wavelength of the C-band signal is between 71.4mm and 88.2mm, if a metal mesh is used to shield interference waves, in order to prevent interference sources from leaking into the metal mesh, the aperture of the mesh should be less than 1/4 of the shortest wavelength of 71.4mm, that is, less than 17.85mm. If the interference is not serious, you can also add a circle of metal band with a width of 10-20cm on the outer edge of the antenna, perpendicular to the plane of the pot mouth. Of course, the wider the width of the metal band, the stronger the anti-interference performance, but this method is not suitable for antennas with multiple satellites in one pot, as it will block the satellite signal reception that is not perpendicular to the surface of the pot.
3. Turn to satellite or change Ku head to receive Ku band signal
If the signal you want to receive can also be received on the C-band of other satellites, you can turn to the satellite to receive, change the direction of the receiving antenna, and see if you can avoid the interference area of the interference wave: in addition, you can also turn to the satellite or change the Ku head Receive Ku-band signals to avoid interference. This is the most direct and effective method.