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How to test the interference performance of intelligent jammer for interphone?

How to test the interference performance of intelligent jammer for interphone?

  • 2022/07/25

Using intelligent jammer to meet the interference performance requirements of interphone usually means that "under the condition that the interphone receives and sends text messages with a time distance of 200 meters (transmission power of 35dbm), the effective interference distance is not less than 40 meters (the frequency jammer is placed on the ground); so how to test it? What requirements does it have on the test environment and test conditions of the frequency jammer?

Test method:

1. Arrange the frequency jammer and interphone. All equipment is in a straight line (no obstacle in the middle). Interphones are divided into calling interphones and called interphones, with a distance of 200 meters between them. The called interphone is 40 meters away from the frequency jammer. During the test, the walkie talkie is required to be vertically upward (the antenna faces the sky) and placed on the desktop 1 meter above the ground. The personnel participating in the test shall not block the transmission route between the three when holding the walkie talkie each time, and ensure that the state is consistent when holding it each time.

2. After the intelligent jammer is ready for power on, set the communication frequency points of a group of walkie talkies randomly (analog walkie talkies set the communication frequency points, digital walkie talkies set the communication channels), and then turn on the frequency jammer to start the test.

3. The intelligent jammer needs to use mains power supply. After turning on the frequency jammer, confirm that the power output of each frequency band module is normal and in the maximum transmission power output state. The calling interphone starts to call the called interphone continuously (call 5 times within 30s, and the duration of each call is not less than 3S), and the continuous test lasts for 30s. When the called interphone cannot be connected, it is considered that the interference of the frequency jammer against the interphone is effective.

4. When the interference is effective, adjust the distance between the frequency jammer and the called interphone to the current distance +5m, and then repeat the test according to the previous steps;

5. Until the interphone cannot talk normally, record the mutual spacing value between the frequency jammer, the host interphone and the called interphone, and the test is over.

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