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Home  Brazil - Official Letter 81/2025 Clarification about Vehicle Indoor Environment |
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ANATEL issued Official Letter 81/2025 to clarify and harmonize the definition of indoor environments for the use of 5150-5350 MHz frequency range, particularly in vehicular applications on March 12, 2025.
According to ANATEL, an indoor environment refers to an environment with conditions that provides attenuation of transmitted signals due to building penetration, thus reducing emissions in multiple directions. This definition is detailed in item 3.1.1 of Act 14448.
Based on this definition, ANATEL has specified that the 5150-5350 MHz band (WLAN B1/B2) is allowed only in vehicles with a fully enclosed structure (simulating an indoor environment), such as cars and trucks. Therefore, this band cannot be used in open vehicles, including motorcycles, tuk-tuks and convertible cars.
For more details, Pls refer to the official letter available on ANATEL’s website here.
Feel free to contact us for more information.
2025-04-01
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