Subelement A: RADAR Principles – 10 Key Topics – 10 Exam Questions – 8 Drawings— Topic 6: Pulse Width - Pulse Repetition Rates
Question 8-6A1
Element 8 (RADAR)If the PRF is 2500 Hz, what is the PRI?
Explanation
Pulse Repetition Frequency (PRF) and Pulse Repetition Interval (PRI) are inversely related. PRF is the number of pulses transmitted per second, while PRI is the time duration between the start of one pulse and the start of the next.
To find the PRI, you divide 1 by the PRF:
PRI = 1 / PRF
Given PRF = 2500 Hz:
PRI = 1 / 2500 Hz = 0.0004 seconds
To convert seconds to microseconds (µs), multiply by 1,000,000 (since 1 second = 1,000,000 µs):
PRI = 0.0004 seconds * 1,000,000 µs/second = 400 µs
Therefore, the PRI is 400 microseconds. The other options are incorrect as they do not represent the inverse of a 2500 Hz PRF.
Related Questions
8-5A5 For a range of 30 nautical miles, the RADAR pulse repetition frequency should be:8-5A6 For a range of 10 nautical miles, the RADAR pulse repetition frequency (PRF) should be:8-6A2 If the pulse repetition frequency (PRF) is 2000 Hz, what is the pulse repetition interval (PRI)?8-6A3 The pulse repetition rate (PRR) refers to:8-6A4 If the RADAR unit has a pulse repetition frequency (PRF) of 2000 Hz and a pulse width of 0.05 microseconds, what is the duty cycle?