What is the role of frequency hopping in Link 16 security?

• A. It locks to a single carrier frequency for stability.
• B. It periodically changes channel assignments to support new missions.
• C. It rapidly changes carrier frequencies to reduce interception risk and jam susceptibility.
• D. It is used only for weather mitigation.

Answer: (C)

Frequency hopping in Link 16 strengthens security by making interception and jamming difficult. It rapidly changes the carrier frequency according to a pseudo-random sequence shared by all participants, so the transmission hops across many frequencies over time. Because the transmitter and receiver stay synchronized to the same hopping pattern, an observer or jammer can’t reliably monitor or block the signal on a single frequency. If a jammer blocks one frequency, the communication quickly moves to another, greatly reducing the effectiveness of interception and jamming. This hopping works alongside time-division access and encryption to create a robust, hard-to-intercept, hard-to-jam link. Staying on one frequency would be vulnerable, while changing channels for mission updates or weather mitigation isn’t how Link 16 provides its security benefits.