75 Ohm BNC — the impedance that changes the cable choice
The Amphenol 112954-10 is a BNC plug kit built for 75 Ohm systems — the impedance standard for video, broadcast, and precision instrumentation, not the 50 Ohm of general-purpose RF.
What the 75 Ohm rating means for your cable run
A 75 Ohm BNC is dimensionally identical to a 50 Ohm BNC at the interface — they mate — but the centre pin diameter and dielectric geometry differ. Using a 75 Ohm plug on 50 Ohm cable creates an impedance step that reflects signal energy. The 112954-10 is specced for 75 Ohm cable groups, specifically 1-1/2" annular cable per the listing. The 4 GHz ceiling and 0.2 dB insertion loss are measured into that 75 Ohm line; swap the cable impedance and the loss figure no longer holds.
Kit contents — what ships in the bag
This is a field-installable kit, not a bare connector. Each package contains 5 pieces: one BNC plug body, one crimp contact, one ferrule, one insulator, and one sleeve. The PTFE insulator centres the pin in the body. No separate parts to order — everything for one termination is in the bag.