TNC Plug, 50 Ohm, Rated to 11 GHz — Cable Group RG-55, 142, 223, 400
The 31-2373: The threaded coupling gives a vibration-resistant mate, and the 500 V rating covers typical RF power levels through the cable group it is sized for. The cable group — RG-55, 142, 223, 400 — determines the dielectric diameter the ferrule and centre contact are machined for.
11 GHz Ceiling and Insertion Loss
The 11 GHz maximum frequency is the practical upper limit of the TNC interface geometry before higher-order modes propagate. For a 50 Ohm system, the 0.18 dB insertion loss at the rated band is low enough that a single mated pair adds negligible attenuation to a cable run — the loss budget is dominated by the coax itself.
Operating Range and Build
The threaded fastening gives a positive stop; hand-tight plus a quarter-turn with a wrench is the usual field practice.