Which of the following connector types is most suitable as an RF connector for frequencies above 400 MHz?
Why The Type N connector is a constant-impedance 50 ohm design with a threaded, weather-resistant shell, so it maintains a uniform impedance through the junction and works well up to several GHz. That makes it the standard choice for VHF, UHF and microwave work, including everything above 400 MHz.
Watch out The PL-259 (UHF connector) is tempting because it is the most common ham connector, but despite the name it is not impedance-matched and its performance degrades above roughly 300 MHz; RG-213 is a coaxial cable, not a connector, and DB-25 is a multi-pin computer data connector.
N for Nice and high frequeNcy; PL-259 is for HF and 2 meters despite the 'UHF connector' name.