The jammer's power must...

• A. Match or exceed target signal
• B. Be below target signal
• C. Be aligned to the sun
• D. Be unrelated to the target

Answer: (A)

In electromagnetic warfare, the goal of a jammer is to raise the noise floor at the receiver enough to drown out the legitimate signal. To do that effectively, the jammer’s power arriving at the target receiver must be at least as strong as the received target signal (considering path losses and antenna gains). When the jammer’s signal is equal to or greater than the wanted signal, the received signal-to-interference ratio drops, making it hard or impossible for the receiver to recover the original information. If the jammer is weaker than the target signal, the receiver can still pull out the desired signal, so disruption is ineffective. Options that rely on sun alignment or being unrelated to the target don’t actively reduce the received signal quality, and a jammer weaker than the target won’t achieve meaningful disruption.