Nondirectional beacons use what type of modulation?

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Study for the Pilot's Handbook of Aeronautical Knowledge Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

Nondirectional beacons use what type of modulation?

Explanation:
Nondirectional beacons transmit a continuous carrier that is modulated by an audio-frequency tone to carry the beacon’s identification. The modulation tone used for these identifications is typically in the audio range, specifically 400 Hz or 1020 Hz. This tone is what the ADF receiver uses to extract and hear the Morse code ID from the beacon. So, the correct choice reflects the standard modulation tones: 400 Hz or 1,020 Hz. The other options don’t fit because 60 Hz would be related to power-line noise rather than the beacon’s intended modulation, and 1200 Hz is not the standard tone used for NDB identifications.

Nondirectional beacons transmit a continuous carrier that is modulated by an audio-frequency tone to carry the beacon’s identification. The modulation tone used for these identifications is typically in the audio range, specifically 400 Hz or 1020 Hz. This tone is what the ADF receiver uses to extract and hear the Morse code ID from the beacon.

So, the correct choice reflects the standard modulation tones: 400 Hz or 1,020 Hz. The other options don’t fit because 60 Hz would be related to power-line noise rather than the beacon’s intended modulation, and 1200 Hz is not the standard tone used for NDB identifications.

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