According to the International Telecommunication Union (ITU) code, a radio signal may be classified by three symbols. The abbreviation A3E is used for the type of transmission in which the carrier wave is:

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A continuous wave interrupted with a keyed Morse code ident as used by an NDB.

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Amplitude modulated by a speech signal, such as is used for VHF-COM.

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Interrupted to transmit the Morse code identification, as used by an NDB.

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Amplitude modulated to transmit the Morse code ident, as is used by a VOR.

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According to the International Telecommunication Union (ITU) code, a radio signa...

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