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Old 6th Nov 2009, 21:38
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hetfield
 
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ADF
Identifying Tone
Q. Are there any NDB (Non-Directional Beacon) stations that still use 400 Hz tones for the Morse Code identifier? ICAO (International Civil Aviation Associaton) states that in addition to 1020 Hz tones, 400 Hz may also be used.
A. The ICAO world standard does specify that an NDB audio ident may be either 1020 or 400 Hz. But in many years of flying and tuning hundreds of NDB's we've never heard a 400 Hz tone.
Practical Avionics
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