What is the purpose of the receiver IF Shift control?
The correct answer is C: To reduce interference from stations transmitting on adjacent frequencies. What is the purpose of the receiver IF Shift control is to reduce interference from stations transmitting on adjacent frequencies. IF Shift moves the IF passband to avoid adjacent interference. For amateur radio operators, this is important for receiver operation. Understanding this helps when reducing interference.
Exam Tip
IF Shift purpose = reduce interference from stations on adjacent frequencies. Think 'I'F 'S'hift = 'I'nterference 'S'hifting (away). IF Shift moves the IF passband to avoid adjacent interference. Not different frequency, not rapid change, not off-frequency tuning - just reduce adjacent interference.
Memory Aid
"IF Shift purpose = reduce interference from stations on adjacent frequencies. Think 'I'F 'S'hift = 'A'djacent interference reduction. IF Shift moves the IF passband to avoid adjacent interference. Important for receiver operation."
Real-World Application
The receiver IF Shift control: Its purpose is to reduce interference from stations transmitting on adjacent frequencies. By shifting the IF passband, you can move away from interfering signals while keeping the receive frequency the same. This is the purpose - reduce adjacent interference.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Permitting listening on different frequency from transmitting isn't the purpose - IF Shift reduces adjacent interference. Different frequency isn't the purpose.
Option B: Incorrect. Changing frequency rapidly isn't the purpose - IF Shift reduces adjacent interference. Rapid frequency change isn't the purpose.
Option D: Incorrect. Tuning in stations slightly off frequency isn't the purpose - IF Shift reduces adjacent interference. Off-frequency tuning isn't the purpose.
题目解析
The correct answer is C: To reduce interference from stations transmitting on adjacent frequencies. What is the purpose of the receiver IF Shift control is to reduce interference from stations transmitting on adjacent frequencies. IF Shift moves the IF passband to avoid adjacent interference. For amateur radio operators, this is important for receiver operation. Understanding this helps when reducing interference.
考试技巧
IF Shift purpose = reduce interference from stations on adjacent frequencies. Think 'I'F 'S'hift = 'I'nterference 'S'hifting (away). IF Shift moves the IF passband to avoid adjacent interference. Not different frequency, not rapid change, not off-frequency tuning - just reduce adjacent interference.
记忆口诀
IF Shift purpose = reduce interference from stations on adjacent frequencies. Think 'I'F 'S'hift = 'A'djacent interference reduction. IF Shift moves the IF passband to avoid adjacent interference. Important for receiver operation.
实际应用示例
The receiver IF Shift control: Its purpose is to reduce interference from stations transmitting on adjacent frequencies. By shifting the IF passband, you can move away from interfering signals while keeping the receive frequency the same. This is the purpose - reduce adjacent interference.
错误选项分析
Option A: Incorrect. Permitting listening on different frequency from transmitting isn't the purpose - IF Shift reduces adjacent interference. Different frequency isn't the purpose. Option B: Incorrect. Changing frequency rapidly isn't the purpose - IF Shift reduces adjacent interference. Rapid frequency change isn't the purpose. Option D: Incorrect. Tuning in stations slightly off frequency isn't the purpose - IF Shift reduces adjacent interference. Off-frequency tuning isn't the purpose.
知识点
Receiver IF Shift control, Reduce interference, Stations transmitting on adjacent frequencies, IF passband
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.