ARRL Technician Practice Exam

What is a Part 15 device?

1. An unlicensed device that may emit low powered radio signals on frequencies used by a licensed service

2. A licensed device transmitting at high power

3. A device that can operate on any frequency without restriction

4. An unregulated two-way communication device

The correct answer is: An unlicensed device that may emit low powered radio signals on frequencies used by a licensed service

A Part 15 device refers to an unlicensed radio transmission device that is permitted to operate within certain parameters set forth by the Federal Communications Commission (FCC). These devices are intended to emit low power radio signals without requiring a license, provided that they do not interfere with licensed services and operate within specified frequency ranges. The importance of this classification lies in its support for various applications such as wireless computer networks, remote controls, and consumer electronics like baby monitors and garage door openers. Part 15 devices must comply with strict technical standards to limit their power output and range, ensuring they do not cause interference to licensed users. This option accurately captures the essence of Part 15 operations. Other choices do not align with the regulations governing these devices; licensed devices (the second option) would require compliance with different rules and would not be classified under Part 15. Operating on any frequency without restrictions (the third option) contradicts the specific limitations imposed on Part 15 devices. Finally, while unregulated communication devices may exist, they do not fit the definition of Part 15 due to the clear regulatory framework that governs their operation. Thus, the first choice correctly encapsulates the definition of a Part 15 device.