In the context of radio communications, telemetry describes:

• A. Electronic signals are converted into audible signals and transmitted
• B. Two-way simultaneous communication
• C. Voice encryption standards
• D. Selection of scanning frequencies

Answer: (A)

Telemetry is the automatic transmission of measurements from remote instruments to a receiving station. In radio terms, sensors or instruments at a distance produce an electrical signal that represents a parameter (such as temperature, pressure, or position). This signal is prepared for transmission—often converted into a suitable audible or RF-form—and sent over the radio link so the ground station can decode and monitor the data. This focus on sending remote data distinguishes telemetry from two-way voice communication, from encryption standards, or from simply selecting or monitoring scanning frequencies.