Which of the following RF connector types is most suitable for frequencies above 400 MHz?
The correct answer is B: Type N. Type N connectors are most suitable for frequencies above 400 MHz. Type N connectors are designed for high-frequency operation with good performance up to 11 GHz. They have better electrical characteristics (lower loss, better shielding) than UHF connectors at high frequencies. For amateur radio operators, Type N connectors are the standard for UHF and microwave operation. Understanding connector types helps when building feed lines for different frequency ranges.
Exam Tip
Above 400 MHz = Type N connector. Think 'N' connector = 'N'ext level (high frequency). Designed for UHF and microwave, good performance to 11 GHz. UHF connectors are for lower frequencies, DB-25 is computer connector.
Memory Aid
"Above 400 MHz = Type N connector. Think 'N' connector = 'N'ext level (high frequency). Standard for UHF/microwave operation. Better performance than UHF connectors at high frequencies."
Real-World Application
You're building a feed line for 70 cm (440 MHz). You use Type N connectors because they're designed for high-frequency operation and provide low loss and good shielding. UHF (PL-259) connectors would work but have higher loss and poorer performance. Type N is the professional choice for UHF and microwave frequencies.
Key Concepts
Why Other Options Are Wrong
Option A (UHF/PL-259): Incorrect. UHF connectors work well at HF and VHF but have poor performance above 400 MHz due to their design. They're not suitable for UHF/microwave.
Option C (RS-213): Incorrect. RS-213 isn't a standard connector type. This appears to be a distractor.
Option D (DB-25): Incorrect. DB-25 is a computer connector (parallel port), not an RF connector. It's completely unsuitable for RF use.
题目解析
The correct answer is B: Type N. Type N connectors are most suitable for frequencies above 400 MHz. Type N connectors are designed for high-frequency operation with good performance up to 11 GHz. They have better electrical characteristics (lower loss, better shielding) than UHF connectors at high frequencies. For amateur radio operators, Type N connectors are the standard for UHF and microwave operation. Understanding connector types helps when building feed lines for different frequency ranges.
考试技巧
Above 400 MHz = Type N connector. Think 'N' connector = 'N'ext level (high frequency). Designed for UHF and microwave, good performance to 11 GHz. UHF connectors are for lower frequencies, DB-25 is computer connector.
记忆口诀
Above 400 MHz = Type N connector. Think 'N' connector = 'N'ext level (high frequency). Standard for UHF/microwave operation. Better performance than UHF connectors at high frequencies.
实际应用示例
You're building a feed line for 70 cm (440 MHz). You use Type N connectors because they're designed for high-frequency operation and provide low loss and good shielding. UHF (PL-259) connectors would work but have higher loss and poorer performance. Type N is the professional choice for UHF and microwave frequencies.
错误选项分析
Option A (UHF/PL-259): Incorrect. UHF connectors work well at HF and VHF but have poor performance above 400 MHz due to their design. They're not suitable for UHF/microwave. Option C (RS-213): Incorrect. RS-213 isn't a standard connector type. This appears to be a distractor. Option D (DB-25): Incorrect. DB-25 is a computer connector (parallel port), not an RF connector. It's completely unsuitable for RF use.
知识点
Type N connectors, High frequency connectors, UHF/microwave connectors, Connector selection
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.