QMA Snap-On Receptacle — 50 Ohm RF Interface to 6 GHz
The Amphenol 930-112J-51S is a QMA-series panel-mount receptacle with a female socket interface, designed for quick snap-on coupling rather than threaded SMA or bayonet BNC engagement. This is a 50 Ohm controlled-impedance interconnect rated DC to 6 GHz, suited for RF signal paths in telecom base stations, antenna feeds, test equipment, and broadcast gear where repeated connect/disconnect cycles are common. The extended insulation feature provides additional creepage distance between the centre conductor and the flange, supporting the 480 V voltage rating in higher-power RF applications.
Panel Mount with Flange — Solder Termination
Mounting is through a flange with a panel cutout, secured by the snap-on nut on the rear. The shield termination is solder — the outer conductor of the coax cable solders to the body shell, while the centre contact is a solder-cup termination for the signal wire. The dielectric is PTFE, which provides stable impedance up to 6 GHz and handles the -40°C to 80°C operating range without phase drift.