Deep Dive: E4C14
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.
Why Other Answers 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.
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 Example
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.
Source & Coverage
Question Pool: 2024-2028 Question Pool
Subelement: E4C
Reference: 2024-2028 Question Pool · E4 - Amateur Practices
Key Concepts
Verified Content
Question from the official FCC Extra Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the E4C topic.