Which frequency range is designated for Non-Directional Beacons (NDB) in Europe?

The frequency range designated for Non-Directional Beacons (NDB) in Europe indeed spans from 190 KHz to 535 KHz. NDBs are radio navigational aids that transmit signals in this frequency range, which is effective for various types of aerial navigation.

The lower limit of 190 KHz is established to avoid interference with other services, while the upper limit of 535 KHz aligns with the ranges allocated for aviation and maritime use. This range allows aircraft to receive radio signals that assist in determining their position relative to the NDBs, enabling pilots to navigate effectively, particularly in areas where visual references may be limited.

The other frequency ranges mentioned do not align with the specified allocations for NDB operation in Europe. Each of those ranges either overlaps with other services or extends beyond the conventional NDB operational spectrum, making them unsuitable for this purpose.