Question
What is the definition of telemetry?
Answer Options
- A) One-way transmission of measurements at a distance from the measuring instrument
- B) Two-way transmissions in excess of 1000 feet
- C) Two-way transmissions of data
- D) One-way transmission that initiates, modifies, or terminates the functions of a device at a distance
Correct Answer: A
Explanation
In the context of the amateur service, particularly for space stations (satellites) and high-altitude balloon projects, specific technical terms are defined in the FCC rules. Telemetry is a key term in these operations. The FCC defines telemetry as the use of radio communication for one-way transmission of measurements at a distance from the measuring instrument.
This definition applies, for instance, to a satellite transmitting data on its internal temperature, battery voltage, or solar array current down to Earth stations. Telemetry is distinguished from ‘telecommand’ (Option D), which is the one-way transmission used to control the functions of a remote device. Telemetry is strictly about transmitting collected data from the remote station.
This topic was automatically created to facilitate community discussion about this exam question. Feel free to share study tips, memory tricks, or additional explanations!