ARRL Technician Practice Exam

What is the FCC Part 97 definition of telecommand?

1. A two-way communication to control devices remotely

2. A one-way transmission for information sharing

3. A one-way transmission to initiate, modify or terminate functions of a device at a distance

4. A signal that allows feedback from the device

The correct answer is: A one-way transmission to initiate, modify or terminate functions of a device at a distance

The definition of telecommand under FCC Part 97 refers specifically to a type of communication that is used to initiate, modify, or terminate functions of a device from a distance. This means that telecommand is primarily concerned with the directional transmission of control signals to a device that is not locally accessible, enabling the operator to influence the operation of that device without being physically present. In this context, telecommand can be crucial for various applications such as remotely piloting drones, operating satellite systems, or controlling machinery in hazardous environments. The focus here is on the ability to command the operation of equipment from afar, distinguishing it from other forms of communication that might simply share information without engaging in control functions. Thus, a one-way transmission aspect emphasizes that the control signals do not necessarily require an immediate response or feedback from the device being commanded, which is a critical aspect of its definition. The other options do not accurately capture this aspect of telecommand: they either describe bidirectional communication, focus solely on information sharing, or imply the necessity of feedback, which are not intrinsic to the telecommand definition provided by the FCC.