Table of Contents
Interference reason
The main reason for 5G signal interference with radio and TV satellite reception is that the 5G signal affects the ability of the tuner to receive satellite signals. The broadcast TV signal decoded by the machine is confused or even unable to decode the program.
The satellite signal is transmitted to the satellite receiving antenna with long transmission distance and low input level. The receiving frequency band of the common tuner is 3400MHz ~ 4200MHz, while the 5G signal of China Telecom and China Unicom is 3400MHz ~ 3600MHz. The signal is strong and continuous and stable, resulting in high frequency All receivers receive 5G signals from operators, and cannot decode satellite signals at all; if it is replaced with a narrowband tuner (3700MHz to 4200MHz) to receive, it will have a certain anti-interference effect, but the 5G signal is stronger, which will cause saturated interference to the tuner. , will affect its working performance, and even damage the components of the high-frequency head, causing the high-frequency head to not work normally.
Anti-5G interference test
Using a broadband test antenna, the antenna receiving and testing frequency range is 600MHz-6000MHz, covering the entire 5G communication frequency band. Combined with the spectrum analyzer, the 5G signal spectrum of China Telecom and China Unicom was successfully captured, and the technical plan was formulated after knowing ourselves and the enemy. We have prepared a variety of anti-5G interference models of different models. Filters and tuners form a variety of test combinations; set up satellite receiving antennas in the 5G base stations of China Telecom and China Unicom, test the anti-interference ability of various filters and tuners in combination, and obtain test data to form anti-5G interference solutions program.
Testing method
The satellite signal received by the satellite receiving antenna is divided into three parts by the signal distributor, which are respectively input to the spectrum analyzer, the satellite tuner and the satellite receiver. The spectrum analyzer mainly displays the L-band spectrum decoded by the tuner; the satellite tuner can display the signal-to-noise ratio, signal strength, quality and TV picture of the satellite received signal; the satellite receiver can display the satellite received signal strength and signal interruption when it is interfered count. Observe and record instrument and equipment data changes by changing different tuner and filter combinations
Test conclusion
* When the 5G base station of China Telecom and China Unicom is within a short distance from the satellite receiving antenna and there is no obstruction, the problem of 5G signal interfering with the satellite receiving signal is very serious, and the satellite signal cannot be stably decoded by using the tuner alone, so C-band filtering must be installed. A stable radio and TV signal source can be obtained only when the device is used in combination;
* Telecom 5G signal and China Unicom 5G signal have different ability to interfere with radio and television satellite reception, China Unicom 5G signal interference ability is much stronger than China Telecom 5G signal, and it needs to be treated differently in actual operation;
* The anti-5G interference ability of the narrowband tuner is much better than that of the ordinary tuner; the 5G transmitting antenna has a directivity, and the 5G signal penetration ability is weak. The use of azimuth movement and occlusion can effectively reduce 5G interference.
