MCX connector
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MCX connectors 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.
They use a snap-on interface and usually have a 50Ω impedance. They offer broadband capability from DC to 6 GHz.
These connectors not the same as MC Card connectors, which are smaller and often used to fit on a PC card (PCMCIA/CardBus) in laptops.
MCX Male to MCX Female are standards used for antenna extension.