What is the frequency range for Non-Directional Beacons (NDB) in Europe?

The frequency range for Non-Directional Beacons (NDB) in Europe is primarily allocated from 190 KHz to 1750 KHz. This range allows for effective navigation and communication within aviation, particularly for instrument approaches and en-route navigation.

NDBs operate in this frequency band because it is suitable for medium and long-range navigation due to the ability of low-frequency signals to follow the curvature of the earth and penetrate various atmospheric conditions. The choice of frequencies ensures compatibility with aircraft receivers, which are designed to tune into this specific range for reliable operation.

While other ranges mentioned in the options may include partially correct frequencies, they either extend beyond or fall short of the defined range for NDBs, making them unsuitable as an answer.