Question T9B06
From subelement T9 - T9B
Which of the following RF connector types is most suitable for frequencies above 400 MHz?
Why is this correct?
Type N connectors are specifically engineered for UHF and microwave frequencies, making them the best choice above 400 MHz due to their low loss and excellent shielding. PL-259/SO-239 connectors, despite being called 'UHF connectors,' actually work well only up to about 150 MHz and become lossy at higher frequencies. RS-213 is coaxial cable, not a connector type, and DB-25 is a computer serial connector with no RF applications.
Memory tip
Look for frequency-specific design clues: despite names like 'UHF connector' for PL-259, the actual engineering determines performance. Type N's precision construction and controlled impedance make it superior for microwave work, while older designs like PL-259 were named before today's frequency allocations.
Learn more
Type N connectors feature precision machining with controlled 50-ohm impedance and weatherproof sealing, making them essential for repeater installations, satellite communication systems, and microwave bands where signal integrity is critical. Their threaded coupling provides consistent connection under temperature variations and mechanical stress. While larger than SMA connectors, Type N offers the best balance of power handling, low loss, and reliability for serious VHF/UHF operations above 400 MHz.
Think about it
Why do you think older connector designs like PL-259 become problematic at higher frequencies, even though they're nicknamed 'UHF connectors'?