Deep Dive: E7B03
The correct answer is A: A filter to remove harmonic content. What circuit is required at the output of an RF switching amplifier is a filter to remove harmonic content. Switching amplifiers generate harmonics that must be filtered. For amateur radio operators, this is important for amplifier design. Understanding this helps when designing switching amplifiers.
Why Other Answers Are Wrong
Option B: Incorrect. High-pass filter to compensate for low gain at low frequencies isn't required - filter to remove harmonics is required. High-pass filter isn't required. Option C: Incorrect. Matched load resistor to prevent switching transients isn't required - filter to remove harmonics is required. Load resistor isn't required. Option D: Incorrect. Temperature compensating load resistor isn't required - filter to remove harmonics is required. Temperature compensation isn't required.
Exam Tip
RF switching amplifier output circuit = filter to remove harmonic content. Think 'R'F 'S'witching 'A'mplifier = 'F'ilter 'H'armonics. Switching amplifiers generate harmonics that must be filtered. Not high-pass filter, not load resistor, not temperature compensation - just filter to remove harmonics.
Memory Aid
RF switching amplifier output circuit = filter to remove harmonic content. Think 'R'F 'S'witching = 'F'ilter 'H'armonics. Switching amplifiers generate harmonics that must be filtered. Important for amplifier design.
Real-World Example
At the output of an RF switching amplifier: A filter to remove harmonic content is required. Switching amplifiers generate harmonics due to the switching action, and these must be filtered out. This is the circuit - filter to remove harmonics.
Source & Coverage
Question Pool: 2024-2028 Question Pool
Subelement: E7B
Reference: 2024-2028 Question Pool · E7 - Practical Circuits
Key Concepts
Verified Content
Question from the official FCC Extra Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the E7B topic.