Explain frequency agility in EW.

• A. Increasing bandwidth without changing frequency.
• B. Staying on a single frequency to maximize energy on target.
• C. Rapidly changing operating frequency to avoid jamming and maintain link integrity.
• D. Randomly turning frequency on and off.

Answer: (C)

Frequency agility is about changing the operating frequency rapidly during use to stay effective and avoid disruption. In an EW context, this means hopping across frequencies in a controlled pattern (often pseudo-random) so a jammer can’t lock onto a single tone and degrade the link. By continually shifting the frequency, the system maintains communication or sensing performance even in a contested or noisy spectrum, and it makes it harder for adversaries to predict and jam the signal. This approach requires tight coordination between transmitter and receiver so both stay in sync with the hopping pattern, and it can demand fast, flexible hardware to change frequencies without losing signal integrity. The other options miss the point: increasing bandwidth without changing frequency doesn’t introduce agility; sticking to one frequency defeats the purpose of agility; randomly turning the frequency on and off isn’t the deliberate, rapid frequency variation used to dodge jamming.