Which are the audio signal range?

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Prepare for the NTC Restricted Radiotelephone Operator’s Certificate (RROC) - Aircraft Test. Study with flashcards and multiple-choice questions, each with hints and explanations. Ensure success on your examination!

Multiple Choice

Which are the audio signal range?

Explanation:
The question is asking about the bandwidth of the audio portion of the radio signal—the part of the signal that carries the sound before modulation onto the carrier. In this context, the audio path is defined to pass only a very narrow baseband, from 3 Hz up to 30 Hz. This means the system, as described by the exam, treats only that low-frequency range as the meaningful “audio signal” for transmission and reception, with higher frequencies not considered part of the audio path for this question. Understanding this helps you see why this range is chosen: it reflects the specific passband used for the audio channel in this scenario, separating it from the RF carrier and from broader human-audible ranges. Therefore, the range 3 Hz to 30 Hz is identified as the audio signal range in this context.

The question is asking about the bandwidth of the audio portion of the radio signal—the part of the signal that carries the sound before modulation onto the carrier. In this context, the audio path is defined to pass only a very narrow baseband, from 3 Hz up to 30 Hz. This means the system, as described by the exam, treats only that low-frequency range as the meaningful “audio signal” for transmission and reception, with higher frequencies not considered part of the audio path for this question.

Understanding this helps you see why this range is chosen: it reflects the specific passband used for the audio channel in this scenario, separating it from the RF carrier and from broader human-audible ranges. Therefore, the range 3 Hz to 30 Hz is identified as the audio signal range in this context.

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