What modulation is used on the VHF band 108 to 136.975 MHz?

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Prepare for the VT-IV Navigation Familiarization Exam II. Master navigation techniques with flashcards and multiple choice questions, with each answer fully explained. Boost your confidence and ace your exam!

Multiple Choice

What modulation is used on the VHF band 108 to 136.975 MHz?

Explanation:
Navigation signals in the VHF aviation band are amplitude modulated. Ground-based navaids like VOR and ILS localizers transmit the carrier with two low-frequency subcarriers (around 30 Hz and 90 Hz) whose relative amplitudes encode the directional information. The receiver decodes this amplitude pattern to determine bearing or course information. This AM scheme is used specifically for the navigation signals, while voice communications in the same spectrum use frequency modulation. So the modulation type used on that VHF band for navigation signals is amplitude modulation.

Navigation signals in the VHF aviation band are amplitude modulated. Ground-based navaids like VOR and ILS localizers transmit the carrier with two low-frequency subcarriers (around 30 Hz and 90 Hz) whose relative amplitudes encode the directional information. The receiver decodes this amplitude pattern to determine bearing or course information. This AM scheme is used specifically for the navigation signals, while voice communications in the same spectrum use frequency modulation. So the modulation type used on that VHF band for navigation signals is amplitude modulation.

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