Part 15 Wireless Transmitters and Intentional Radiators

Determine the transmitter's frequency, modulation, bandwidth, power and intended use, then locate the relevant general or frequency-specific provision. A frequency described as an ISM band is not unrestricted spectrum. Different provisions can impose different limits and conditions within the same broad range. Wireless equipment outside Subpart C requires its own review, including technologies governed by other Part 15 subparts or licensed services.

Section 15.201 generally requires certification for intentional radiators, while identifying particular SDoC and other exceptions. The precise device and rule provision determine the pathway. The certification file should connect the applicant, model and technical evidence to the authorized functions. A successful laboratory measurement does not itself issue the grant, and approval obtained for a different frequency or operating mode does not establish coverage.

Antenna type, gain, connection and installation can affect conformity, alongside power and channel settings. Review the antenna provisions and the conditions of the authorization. Software that controls regulatory parameters belongs within the configuration assessment. A user-selectable setting or later firmware update should not enable operation outside the permitted range or invalidate the basis on which the transmitter was evaluated.

Technical requirements can address fundamental emissions, bandwidth, out-of-band emissions, restricted bands and other frequency-specific characteristics. The test plan needs the actual modes and operating conditions required by the applicable provision. Results for one channel or nominal setting may not represent every supported mode. Retain sufficient detail to show how the testing covers the configuration and limits claimed for the marketed product.

Required identification, statements and instructions should correspond to the authorized device and its conditions. Where operation depends on particular antennas, installation arrangements or accessories, that information must remain connected to the product. Part 15 operation does not confer a right to cause harmful interference and includes obligations concerning interference received. Sales material should preserve these conditions rather than suggesting unrestricted or interference-protected operation.

Antenna substitutions, altered power settings, added radios and changed enclosures can require reassessment or further authorization action. Examine RF exposure separately where applicable, including simultaneous-transmission conditions. FCC conformity concerns the radiofrequency framework, while product safety and other obligations remain distinct. Keep the exact grant, configuration and instructions linked so procurement and production do not substitute an outwardly similar but differently authorized transmitter.