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An increase in magnetron current that coincides with a decrease in power output is an indication of "magnetron magnet weakening."
Explanation: A magnetron is a type of electron tube used in RADAR transmitters to generate microwave signals. It contains permanent magnets that provide the magnetic field necessary for electron beam focusing and interaction with the resonant cavities, leading to microwave generation.
If the magnetron's permanent magnets weaken over time or due to certain conditions, the magnetic field strength within the tube diminishes. This weakening can result in the electron beam not being focused correctly, causing an increase in magnetron current as the system attempts to maintain proper operation.
However, despite the increased current, the microwave power output decreases since the weakened magnetic field affects the electron-beam-cavity interaction, resulting in reduced microwave generation.
Mnemonic: "Magnet Weakening"
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Both question and answer have receive
The question says that only weak signal echos from small targets are affected.
Answer A. is the right answer because all the causes listed reduce the level of the signal at the receiver's detector thus specifically keeping small target weak returns from being received.
Answers B., C. and D. are wrong because they affect all targets regardless of signal strength.
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A strong magnetic field is required to keep the electron beam inside a Magnetron focused.
Without the magnetic field current runs away and destroys the Magnetron.
Answer A. is the right one.
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