N Connector

Overview

The Type N connector was designed to be a genuine constant-impedance connector. Its internal geometry maintains a 50 ohm characteristic impedance through the mating plane, and its threaded coupling and gasket make it both mechanically stable and reasonably weatherproof.

That makes it the right choice for 2 metre and 70 centimetre work, and for any coax run that will be exposed to weather. It is more expensive than a PL-259 and requires more care to fit, but above 300 MHz there is no real alternative in common amateur use.

Bands and modes

Band coverage

Modes

Safety note

Using it well

• Use N connectors for every permanent outdoor run at VHF and above.
• Torque the coupling by hand only; the thread is finer than it looks.
• Fit a drip loop below the connector so water cannot run into it.
• Inspect the centre pin for corrosion whenever you service the antenna.