RF Launch Design Note
The Amphenol 252117-75 is an MCX jack — a snap-on, subminiature RF connector built for 75 Ohm signal paths. It terminates to the board through surface-mount contacts and a soldered shield ground, keeping the return path short enough to hold the impedance through the launch up to 6 GHz.
The 75 Ohm impedance and 6 GHz max frequency are standard for this connector series.
This jack mounts with surface-mount contacts and a separate solder tab for the shield. The shield termination is critical — it grounds the outer conductor directly to the board ground plane, completing the coaxial return path. Without a solid solder fillet on the shield tab, the ground inductance rises and the impedance through the launch drifts.