Interference test to explore the cause of malfunction of anti-alarm burglar device

Is the failure of the car anti-theft device a technical defect or surrounding interference?

Relevant technical tests show that the frequency bands used by car anti-theft alarms are 315.000-316.000MHz and 430.000-432.000MHz. The technicians of the Radio Administration Bureau tested the transmission signals of more than a dozen types of anti-theft alarm remote controls on site. The test results show that the frequencies of the remote control transmission signals are mostly concentrated between 314.800 and 315.512MHz, and there are three main transmission states of the remote control signals, namely, constant transmission (the signal occupies a certain frequency point for a long time), interval transmission and pulse transmission (transmitted only once). At the same time, it was found that if the remote control is pressed for a long time, its transmission signal state is constant, which will cause other anti-theft alarms using this frequency to fail to work normally.

The technical staff of Quanzhou Radio Management Bureau analyzed that the main reason for the interference of car anti-theft alarms is that the frequency used by the surrounding radio transmission equipment is close to the working frequency of the car anti-theft alarm. The equipment causing interference includes: indoor anti-theft alarms, infrared anti-theft alarms, car anti-theft alarms themselves, and artificially modified car anti-theft alarms, etc. Correct use of the remote control is an important link to eliminate the failure of adjacent car anti-theft alarms. Citizens should use the car remote control with interval transmission or pulse transmission method, and do not hold down the remote control for a long time.