QMA Jack for RG-402 — what the 11 GHz and snap-on coupling mean for your RF path
The 930-122J-51S: Rated to 11 GHz at 50 Ohm impedance, it covers the L-band through X-band — useful for microwave test points, antenna feeds, and compact radio heads where a threaded SMA would slow down field swaps. The snap-on fastening mates quickly with the matching QMA plug, though the 100-cycle rating means this is a moderate-duty interface, not a daily-remate production test port.
Panel-mount kit — what comes in the bag
This is a bulk-packaged kit: one QMA jack, one lockwasher, and one hex nut for front-side bulkhead mounting. The 480 V rating gives headroom if DC bias rides the RF line.
Cable prep and termination — solder both ends
Termination is solder-only: the center contact solders to the RG-402 center conductor, and the shield solders to the connector body. No crimp tool needed, but the semi-rigid cable requires careful strip lengths and a clean solder joint to avoid impedance bumps at the transition.