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Elevator, freezer, metal shelves: Lifangmei Technology summarizes the common interference sources of EAS antennas
After the EAS antenna is installed, it frequently gives false alarms. In many cases, it is not the antenna itself that causes the problem; rather, it is due to the presence of interference sources in the environment.
The following factors may affect the normal operation of the EAS antenna:
| Interference source | Explanation | Solution direction |
| Nearby elevator | Electromagnetic interference generated during motor operation | Increase the distance between the antenna and the elevator |
| First floor reinforced concrete | Steel bars may reflect or absorb signals | Adjust the antenna phase |
| Refrigerator compressor | Interference between signals of the same frequency | Synchronize or stagger the working frequencies |
| Large metal shelves | Metal reflective signals may cause false alarms | Remove or adjust the antenna angle |
| Adjacent store antennas | Interference between signals of the same frequency | Adjust working frequencies either synchronously or by staggering them |
| Walkie-talkies, wireless charging devices | ransmission frequency bands may overlap | Keep a distance |
How to determine whether it is interference or equipment failure?
| Symptom | More likely to be interference | More likely to be equipment failure |
| Timed false alarms (such as when the freezer starts) | ✓ | |
| Increased false alarms during certain periods (such as during peak passenger flow) | ✓ | |
| Continuous false alarms throughout the day | ✓ | |
| Sudden shortening of detection distance | ✓ | |
| False alarm from a single antenna alone | ✓ | |
| False alarms from multiple antennas simultaneously | ✓ |
Steps for troubleshooting interference sources
Observe the pattern of false alarms: record the time, frequency, and duration of the false alarms
Conduct a thorough investigation:
1.Turn off any nearby devices that might cause interference, and observe if the situation improves.
2.Mobile test: Move the antenna to another location for testing
3.View software data: By debugging the software, check the environmental signal strength.
What to do if the interference cannot be eliminated?
If the source of the interference cannot be moved (such as elevators, building structures), consider the following options:
1.Replace with antennas that have stronger anti-interference capabilities (AM is more resistant to interference than RF)
2. Adjust the antenna phase (through the debugging software)
3. Reduce the width of the channel
4. Change the installation location
