Is the pulse repetition frequency adjustable?

• A. No
• B. Yes
• C. Sometimes
• D. Not at all

Answer: (B)

Pulse repetition frequency is the rate at which pulses are sent per second, and you can adjust it in most pulsed-signal systems to suit the task. Changing PRF lets you balance how quickly you get updates with how far away you can accurately resolve echoes. A higher PRF gives more frequent measurements and better tracking of fast targets, but lowers the maximum unambiguous range because echoes from distant targets may still be returning when the next pulse is emitted. A lower PRF extends that unambiguous range but reduces the update rate and can miss rapid motion. Because capability to set PRF to match measurement needs is a common design feature, the pulse repetition frequency is adjustable. Some specialized or fixed designs exist, but in typical practice it is adjustable.