Deep Dive: E1D01
The correct answer is A: One-way transmission of measurements at a distance from the measuring instrument. The definition of telemetry is one-way transmission of measurements at a distance from the measuring instrument. Telemetry sends measurement data one-way from a remote location. For amateur radio operators, this is important for satellite and balloon operations. Understanding this helps when working with telemetry.
Why Other Answers Are Wrong
Option B: Incorrect. Two-way transmissions in excess of 1000 feet isn't telemetry - telemetry is one-way, not two-way. Two-way isn't telemetry. Option C: Incorrect. Two-way transmissions of data isn't telemetry - telemetry is one-way, not two-way. Two-way isn't telemetry. Option D: Incorrect. One-way transmission that initiates/modifies/terminates device functions is telecommand, not telemetry - telemetry is measurements, not control. Device control isn't telemetry.
Exam Tip
Telemetry definition = one-way transmission of measurements at distance. Think 'T'elemetry = 'T'ransmits 'M'easurements one-way. Telemetry sends measurement data one-way from a remote location. Not two-way, not device control - just one-way measurements.
Memory Aid
Telemetry definition = one-way transmission of measurements at distance. Think 'T'elemetry = 'T'ransmits 'M'easurements. Telemetry sends measurement data one-way from a remote location. Important for satellite and balloon operations.
Real-World Example
Telemetry: A weather balloon sends temperature, pressure, and GPS data back to Earth. This is one-way transmission of measurements from the measuring instrument (balloon) at a distance. Telemetry is used in satellites, balloons, and other remote systems to send measurement data. This is what telemetry is - one-way transmission of measurements.
Source & Coverage
Question Pool: 2024-2028 Question Pool
Subelement: E1D
Reference: FCC Part 97.3
Key Concepts
Verified Content
Question from the official FCC Extra Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the E1D topic.