MCX (micro coaxial) connectors are coaxial RF connectors. They have the same inner contact and insulator dimensions as an SMA connector but are 30% smaller. MCX is standardized in European CECC 22220.
MCX connectors use a snap-on interface. The version used by FLIR is specified for 75 Ω impedance to support Tau2 and Quark2 analog video. (50 Ω versions are used for data and RF.) The contact surfaces of the MCX connector are gold-plated. The outer diameter of the plug is approx 3.6 mm, or 0.140 inch.
FLIR includes a 6-foot MCX to BNC cable as part of the VPC module kit. This cable can also be purchased separately from FLIR using part number 4115262, for $30.
We can suggest two MCX cable sources: SAMTEC and CDINT. Both offer MCX (male or plug) to BNC (male) connector options. Low-cost BNC to RCA adapters are readily available for monitors with RCA inputs. The 6-foot cable FLIR furnishes is a SAMTEC RF179-74SP1-72SP1-1829. The CDINT equivalent is a BMC-179-6.