Bangkok: The source of interference affecting motorcycle remote start systems on Rama 2 Road has been identified as a malfunctioning gate control device. Officials from the National Broadcasting and Telecommunications Commission (NBTC) and the Central Investigation Bureau (CIB) inspected the area after reports emerged of motorcycles failing to start with remote keys. The faulty device was found emitting a 433 MHz signal, leading to the disruption, and has been ordered to cease operation.
According to Thai News Agency, Mr. Trairat Wiriyasirikul, Deputy Secretary-General and Acting Secretary-General of the NBTC, announced that NBTC Region 1 officials, with the support of Central Investigation Bureau police, conducted a raid on a building suspected of using equipment causing the interference. The operation followed a search warrant from the Thonburi Criminal Court, targeting the vicinity on Rama 2 Road, specifically between Soi 46 and 48.
The NBTC had earlier received numerous reports concerning motorcycles that would not restart after being turned off, particularly near a gas station where riders are required to switch off their engines while refueling. The NBTC suspected interference from the 433 MHz radio frequency band, which is commonly used for short-range wireless communications. In response, officers were dispatched to the scene with frequency signal analyzers to investigate the problem.
The inspection uncovered an automated security control device on the 5th floor of a building next to the gas station. This gate control system, lacking a model name and displaying Chinese characters, was emitting signals in the 433.85 MHz frequency band at a strength of approximately -26.7 dBm. Officials determined that the device was faulty and likely the cause of the interference affecting motorcycle remote controls. They instructed the building's caretaker to suspend the device's use to prevent further issues and protect public safety. The homeowner agreed to submit the device for further inspection to verify the source of interference and assess its compliance with NBTC standards and regulations.
The 433 MHz frequency is widely used for near-field communication devices and IoT applications, including car gate remotes and village entrance barriers. It is a low-power frequency exempt from licensing due to its broad usage.