What are the three requirements for Link 16 direct connectivity?

The requirement of radio frequency (RF) and point-to-point line-of-sight (LOS) connectivity is crucial for Link 16 operations because Link 16 is a tactical data link that relies on RF communication to transmit data among multiple units in a battlefield. RF allows for the necessary range and flexibility in communication, while LOS ensures that there is a direct, unobstructed connection between transmitting and receiving units, minimizing interference and maximizing signal integrity.

In the context of Link 16, the RF aspect includes selecting appropriate frequency bands capable of supporting high-speed data traffic and secure communications. The point-to-point line-of-sight requirement ensures that signals can be transmitted without significant degradation, which is vital for time-sensitive and mission-critical operations where real-time data exchange is necessary.

The factors listed in the other choices are not primary requirements for establishing direct connectivity. While relay systems can enhance network reliability, they are not essential for direct connectivity. Similarly, while sufficient signal strength is important for effective communication, it is more of a consequence of the established connectivity rather than a foundational requirement. Secure frequency hopping is a characteristic of Link 16 that enhances security but does not pertain directly to the physical connectivity requirements.