What devices are commonly used as VHF and UHF parasitic suppressors at the input and output terminals of a transistor HF amplifier?
The correct answer is C: Ferrite beads. What devices are commonly used as VHF and UHF parasitic suppressors at the input and output terminals of a transistor HF amplifier is ferrite beads. Ferrite beads suppress parasitic oscillations at VHF/UHF. For amateur radio operators, this is important for amplifier stability. Understanding this helps when stabilizing amplifiers.
Exam Tip
VHF/UHF parasitic suppressors at HF amplifier = ferrite beads. Think 'F'errite 'B'eads = 'F'ilters 'B'and (parasitic suppression). Ferrite beads suppress parasitic oscillations at VHF/UHF. Not electrolytic capacitors, not Butterworth filters, not steel-core toroids - just ferrite beads.
Memory Aid
"VHF/UHF parasitic suppressors at HF amplifier = ferrite beads. Think 'F'errite 'B'eads = 'P'arasitic suppression. Ferrite beads suppress parasitic oscillations at VHF/UHF. Important for amplifier stability."
Real-World Application
VHF and UHF parasitic suppressors at the input and output terminals of a transistor HF amplifier: Ferrite beads are commonly used. Ferrite beads add resistance to VHF/UHF signals, suppressing parasitic oscillations. This is the device - ferrite beads.
Key Concepts
Why Other Options Are Wrong
Option A (Electrolytic capacitors): Incorrect. Electrolytic capacitors aren't parasitic suppressors - ferrite beads are. Electrolytic capacitors isn't the device.
Option B (Butterworth filters): Incorrect. Butterworth filters aren't parasitic suppressors - ferrite beads are. Butterworth filters isn't the device.
Option D (Steel-core toroids): Incorrect. Steel-core toroids aren't used - ferrite beads are used as parasitic suppressors. Steel-core toroids isn't the device.
题目解析
The correct answer is C: Ferrite beads. What devices are commonly used as VHF and UHF parasitic suppressors at the input and output terminals of a transistor HF amplifier is ferrite beads. Ferrite beads suppress parasitic oscillations at VHF/UHF. For amateur radio operators, this is important for amplifier stability. Understanding this helps when stabilizing amplifiers.
考试技巧
VHF/UHF parasitic suppressors at HF amplifier = ferrite beads. Think 'F'errite 'B'eads = 'F'ilters 'B'and (parasitic suppression). Ferrite beads suppress parasitic oscillations at VHF/UHF. Not electrolytic capacitors, not Butterworth filters, not steel-core toroids - just ferrite beads.
记忆口诀
VHF/UHF parasitic suppressors at HF amplifier = ferrite beads. Think 'F'errite 'B'eads = 'P'arasitic suppression. Ferrite beads suppress parasitic oscillations at VHF/UHF. Important for amplifier stability.
实际应用示例
VHF and UHF parasitic suppressors at the input and output terminals of a transistor HF amplifier: Ferrite beads are commonly used. Ferrite beads add resistance to VHF/UHF signals, suppressing parasitic oscillations. This is the device - ferrite beads.
错误选项分析
Option A (Electrolytic capacitors): Incorrect. Electrolytic capacitors aren't parasitic suppressors - ferrite beads are. Electrolytic capacitors isn't the device. Option B (Butterworth filters): Incorrect. Butterworth filters aren't parasitic suppressors - ferrite beads are. Butterworth filters isn't the device. Option D (Steel-core toroids): Incorrect. Steel-core toroids aren't used - ferrite beads are used as parasitic suppressors. Steel-core toroids isn't the device.
知识点
Devices, VHF and UHF parasitic suppressors, Input and output terminals, Transistor HF amplifier, Ferrite beads
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.