After investigation, the National Frequencies Agency determined that the 4G network in Gard was interfered by radiation emitted by private wireless headsets.
largeOn April 8, a shocking incident occurred in Gard. The National Frequency Agency (ANFR), which is responsible for all radio frequencies in France, has been required to manage interference to 4G networks. In the town of Sernhac and the 10 km area around it, two antennas were blocked, affecting the 800 MHz 4G network. In order to solve the problem, an investigation was conducted on the spot and the investigators were taken to a very specific source.
An agent of ANFR’s Aix-Marseille regional service went there and found an object due to electromagnetic radiation emitted by it. Using the Yagi directional antenna used for terrestrial TV and the receiver of the laboratory vehicle, the responsible equipment was identified in a village 3 kilometers away from one of the affected relay antennas. The object is in a private residence. With his approval, the internal investigation is still continuing. It turns out that the destructive object is nothing more than an analog wireless headset. There are two types of wireless headsets: Bluetooth and analog. The most recently used Bluetooth technology was introduced in 1994 by the Swedish telecommunications company Ericsson. Its operating frequency is between 2.4 GHz and 2.483 GHz, and allows two devices to connect to each other without a wired link. Simulation is to some extent the ancestor of Bluetooth and runs on the UHF (ultra high frequency) frequency band. According to Olivier Ezratty, an interconnected object and artificial intelligence consultant and expert, the possibility of interference from Bluetooth headsets is zero. “It is almost impossible for wireless headsets using Bluetooth to cause such interference.” The restricted range is 10 meters indoors and 100 meters outdoors. It does not slide in frequency. On the other hand, analog wireless headsets may completely deviate from their service life and cause such problems. “
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The headset in question emits outside of its designated frequency band, which erodes the earphones allocated to the 4G network. Although it complies with European regulations as indicated by the CE mark, it has drifted over time. From the moment the owner unplugs the power source, the interference disappears completely. “The process is very simple. You disconnect and reconnect the interfering device at least two or three times. At the same time, our agent talks to the public operator on the phone, and they tell him whether the program prevents the harassment.” This is Christian Nicolas Pull to talk to us.
If the helmet does not have a CE mark, the owner will face significant legal penalties. CPCE (Postal and Electronic Communications Regulations) Article L. 39.1 states: “The use of radio equipment to disrupt the radio transmission of authorized services under non-compliance with the prescribed conditions is punishable by six months’ imprisonment and a fine. 30,000 Euros”. The agency can also apply to users for radio equipment that does not meet legal conditions and causes interference and intervention costs. “We strive to be realistic, and if we are convinced that the individual cannot know at any time that there is a problem with his object, and he allows us to do the work correctly, we will not collect taxes. Therefore, as far as Sernhac is concerned, the individual does not need to pay,” Christian ·Nicolaï (Christian Nicolaï) said.
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Generally, interference is caused by radio equipment that has drifted and no longer meets the non-interference requirements. Derivation may come from the aging of one of these components, undisconnected faulty equipment, and non-compliant equipment. For most non-food products, this European regulation is mandatory and reflects the manufacturer’s commitment to the product’s compliance with European evidence. However, Christian Nicolai, deputy director of Aix-Marseille Regional Services at ANFR, said: “Simple household appliances can cause such interference. For example, HDMi boxes and cables may radiate “”.
Other larger devices can also affect the network. In Saint-Nicolas-de-Port on the outskirts of Nancy, it is difficult for residents to receive the TNT channel between 6 pm and 8 pm. On the spot, the Nancy area service staff found that the interference came from the lighting system of the public gymnasium. Since the failure point is installed on the shaft of the personal rake antenna, the interference comes from electromagnetic compatibility issues.
Interference cases are not uncommon, and investigators are often mobilized. The deputy head of Aix-Marseille’s service department told us that the number of interventions has grown exponentially. “Within the scope of our actions, by the first quarter of 2021, there will be approximately one hundred interventions, including those that have addressed the interventions that occurred at the end of 2020. These interventions cannot be directly addressed.”