What frequency range does a Non-Directional Beacon (NDB) operate within?

A Non-Directional Beacon (NDB) operates within the frequency range of 190-535 kHz. This frequency range is designated specifically for the operation of NDBs, which are radio beacons used in aviation for navigation.

These beacons emit signals that can be received by aircraft, helping pilots determine their position concerning the beacon's location. The chosen frequency range is critical because it allows for effective signal propagation and compatibility with aircraft navigation systems.

While the other options mention frequency ranges that fall outside of the specified operational limits for NDBs, the 190-535 kHz range is established as standard for aeronautical navigation purposes, ensuring reliable communication and navigational support for pilots on their routes.