Meaning
The Federal Communications Commission regulates radio frequency devices in the United States to ensure they do not cause harmful interference. This federal regulation, known as title 47 CFR part 15, applies to both intentional and unintentional radiators, from radio modules to consumer electronics. Compliance with these rules is mandatory for marketing or selling any electronic device in the country.
It establishes the limits for both radiated and conducted emissions.
Emission Limit
Unintentional radiators can emit electromagnetic energy through their housing or power cables, which can disrupt other services. The regulation sets strict limits on these unwanted emissions across different frequency bands.
Modular Approval
Radio manufacturers can obtain authorization for a module by demonstrating compliance with the regulation under specific conditions. This modular approval allows host integrators to use the certified module in their products without repeating the full transmitter testing. It reduces the time and cost required to bring a new wireless product to the market.
Labeling Requirement
Devices that comply with the regulation must display a specific warning statement on their housing or in their user manual. This text informs users that the device must accept any interference received, including interference that may cause undesired operation. If the device is too small to carry the label, the statement must be included in the product documentation.
