75-Ohm SMB Plug for RG-179 — 4 GHz Video/Broadband Duty
The Amphenol RF 903-600P-71S is a 75-Ohm SMB plug with a female socket centre contact, designed for crimp attachment to RG-179, 179A, 179B, 187, 187A, Belden 9221, and M17/94-RG179 cables. The 75-Ohm impedance and 4 GHz frequency ceiling make this a video/broadband interconnect, not a generic 50-Ohm RF line — the impedance mismatch penalty is baked into the interface.
Cable Fit and Termination — Crimp Shield, Solder Centre
The shield terminates with a crimp — the braid is captured by the ferrule, not soldered — which gives a consistent, gas-tight connection across the cable group. The centre contact is soldered, so you need a controlled-temp iron for the pin, not a crimp tool for the signal path.
Temperature Range and Mating Cycles
The 500-cycle rating with gold-plated centre contact means this plug is built for field-service reconnects — not a one-time install. The snap-on fastening holds under vibration but releases with a firm pull, so it's not a lock-ring for high-shock environments.