Some types of navaids, such as Non-directional beacons and Distance Measuring Equipment, do not operate on these frequencies; in the case of NDBs the Low frequency and Medium frequency bands are used between 190–415 kHz and 510–535 kHz.
Medium frequency band, of which the medium wave band forms a part.
Railroads used medium frequency range (MF) communications (similar to the AM broadcast band) to improve safety.
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