Which adjustment increases the duty factor?

Which adjustment increases the duty factor?

• A. Increasing receiver gain
• B. Increasing output power
• C. Increasing pulse repetition frequency
• D. Increasing time gain compensation

Answer: (C)

Duty factor is the fraction of time the system is actively transmitting during one cycle. It equals the pulse duration divided by the pulse repetition period. To raise the duty factor you either lengthen the transmitted pulse or shorten the time between pulses. Increasing the pulse repetition frequency shortens the time between pulses (PRP) while leaving the pulse duration the same, so the transmit-on time becomes a larger portion of each cycle, increasing the duty factor. The other adjustments change signal strength or amplification and don’t affect the timing of transmit/receive, so they don’t change the duty factor.

Duty factor is the fraction of time the system is actively transmitting during one cycle. It equals the pulse duration divided by the pulse repetition period. To raise the duty factor you either lengthen the transmitted pulse or shorten the time between pulses. Increasing the pulse repetition frequency shortens the time between pulses (PRP) while leaving the pulse duration the same, so the transmit-on time becomes a larger portion of each cycle, increasing the duty factor. The other adjustments change signal strength or amplification and don’t affect the timing of transmit/receive, so they don’t change the duty factor.