MCX Coaxial Connector
MCX (micro coaxial connector) are coaxial RF connectors developed in the 1980s. They have the same inner contact and insulator dimensions as the SMB connector but are 30% smaller. MCX is standardized in European CECC 22220.
MCX connectors use a snap-on interface and usually have a 50-Ohm impedance (some are 75-Ohm) . They offer broadband capability from DC to 6 GHz. The contact surfaces are gold-plated.
The outer diameter of the plug is approx 3.6 mm or 0.140 inches.
MCX and the smaller MMCX connector are frequently used to connect external antennas to GPS receivers. They are also common on USB DVB-T tuners for computers and laptops, to connect an external antenna to the tuner.