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In summary, certain frequency bands are set aside by the FCC for unlicensed applications. The manufacturer must have the transmitter and receiver tested by a qualified testing laboratory and an FCC ID number obtained. The end user of the product can then operate it without obtaining a license for its use. There are three frequency bands most commonly used for unlicensed operation, 260 – 470MHz, 902 – 928MHz and 2400 – 2483.5MHz. The primary applications in the 260 – 470MHz band are manually operated, narrow band, remote control devices, subject to Part 15.231. Paragraphs A-D specifies the requirements for manual activation of command and control signals, paragraph E applies only if A-D do not apply. In the 902 – 928MHz and 2400 – 2483.5MHz bands a user is allowed to transmit any analog or digital signal within the stipulations for allowed power output, harmonics, and occupied bandwidth. These bands may be used for narrow band and spread spectrum devices. The transmitter and receiver are to be considered individually even if combined to make up a transceiver. The receiver is considered an unintentional radiator and is subject to authorization under the Declaration of Conformity process. It is the responsibility of the manufacturer of the end product to get the product tested as an unintentional radiator. Upon completion of the testing process, the end product should be labeled as prescribed by the FCC. The transmitter is an intentional radiator and subject to certification testing by an accredited laboratory per the regulations for the frequency band of operation. A label displaying the applicant’s FCC ID number and FCC information will need to be placed on the certified product. An exception to this is RF modules that have been pre-certified under the modular approval process, in these cases, the end product must be labeled with the ID number of the included transmitter module.
