The transmitted carrier
wave frequency of ALL Marker Beacons is 75 MHz.
Each MKR BCN carries an audio frequency for Ident
purposes.
Outer Marker 400 Hz Morse Letter O _ _ _ Transmitted at 2 dashes per
second
Middle Marker 1300 Hz Morse Letter C _ . _ . Transmitted
as alternating dashes and dots at a rate of 2 dashes and 6 dots per second
Inner Marker 3000 Hz Morse Letter I . . Transmitted
at 6 dots per second