A RADAR transmitter is operating on 3.0 GHz...

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Question 1 of 20ZqYs3BeZh16fDi3hDsMk

A RADAR transmitter is operating on 3.0 GHz and the reflex klystron local oscillator, operating at 3.060 GHz, develops a 60 MHz IF. If the magnetron drifts higher in frequency, the AFC system must cause the klystron repeller plate to become:

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Question 1 of 20

ZqYs3BeZh16fDi3hDsMk

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🔍 Key Concepts

• Behavior of a reflex klystron when the repeller plate voltage becomes more negative vs less negative • How automatic frequency control (AFC) keeps the IF frequency constant (here, 60 MHz) when the magnetron frequency drifts • Relationship between local oscillator frequency, RF (transmitter) frequency, and IF frequency in a superheterodyne radar receiver

💭 Think About

• If the magnetron frequency increases above 3.0 GHz, what must happen to the local oscillator frequency so the IF stays at 60 MHz? Increase, decrease, or stay the same? • In a reflex klystron, when you make the repeller plate more negative, does the oscillation frequency move up or down? What about if it becomes less negative (closer to zero)? • Match the needed change in oscillator frequency (up or down) to the corresponding change in repeller plate voltage (more negative, less negative, more positive, less positive)

✅ Before You Answer

• Confirm that the IF = |f(oscillator) − f(RF transmitter)| and must remain at 60 MHz • Review how electron transit time between cavities in a reflex klystron changes as the repeller voltage becomes more negative, and how that affects frequency • Eliminate options that describe a voltage change which would shift the klystron frequency in the opposite direction from what is needed to keep the IF at 60 MHz

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