What determines the integrity of an NDB signal?

The integrity of a Non-Directional Beacon (NDB) signal is fundamentally determined by the reception of the Morse code identifier. The Morse code identifier is transmitted by the NDB and serves not only as a means of identification for the pilot but also as a check on the quality and consistency of the signal being received. If the identifier is received clearly and consistently, it indicates that the NDB signal is strong and reliable, thus providing pilots with confidence in their navigation.

In adverse conditions such as ionospheric disturbances or interference, the clarity of the transmitted Morse code can degrade, which could affect the navigation process. Therefore, monitoring the reception of the Morse code identifier is essential for ensuring the integrity of the signal being utilized for navigation.

Other factors, like the distance from the transmitter and the altitude of the aircraft, can influence signal quality and reception, but they do not directly determine the integrity of the NDB signal. The type of aircraft using the NDB does not impact the beacon's signal integrity either. Thus, the successful reception of the Morse code identifier is crucial to assess how well the NDB signal is functioning.