Plain English Meaning

A specific slice of the radio spectrum that older navigation beacons broadcast on. The aircraft's ADF receiver tunes into these signals and points toward the beacon.

Full Definition

A range of radio frequencies used for aviation navigation and communication, where low frequency (LF) covers 30 to 300 kHz and medium frequency (MF) covers 300 to 3,000 kHz. In aviation, L/MF most commonly refers to the band used by Non-Directional Beacons (NDBs) and the Automatic Direction Finder (ADF) receiver in the aircraft.

Context Anchor

Seen in discussions of , especially older beacon-based .