The TACAN transmits out an identification tone (ID tone) of 3 Morse code characters for station identification, the 3 character CW signal is transmitted ____.

The TACAN transmits out an identification tone (ID tone) of 3 Morse code characters for station identification, the 3 character CW signal is transmitted ____.

• A. every 10 seconds
• B. every 60 seconds
• C. every 5 seconds
• D. every 37.5 seconds

Answer: (D)

TACAN identification uses a fixed cadence. The three-character Morse code ID is transmitted as a CW burst, and the entire cycle repeats at a set interval. That cycle lasts 37.5 seconds, so the three-character ID reappears every 37.5 seconds. This steady timing helps receivers reliably detect and decode the ID even with varying signal conditions, and it’s a standard timing used across TACAN stations. The other options would imply ident repeats at frequencies inconsistent with the TACAN specification, whereas 37.5 seconds matches the mandated cadence.

TACAN identification uses a fixed cadence. The three-character Morse code ID is transmitted as a CW burst, and the entire cycle repeats at a set interval. That cycle lasts 37.5 seconds, so the three-character ID reappears every 37.5 seconds. This steady timing helps receivers reliably detect and decode the ID even with varying signal conditions, and it’s a standard timing used across TACAN stations. The other options would imply ident repeats at frequencies inconsistent with the TACAN specification, whereas 37.5 seconds matches the mandated cadence.