HD-BNC Jack for 75 Ohm Signal Paths
The Amphenol 034-1030-12G is an HD-BNC jack with a female socket centre contact, built for 75 Ohm impedance systems. It mates with a standard BNC male plug via the bayonet lock — the same quarter-turn engagement you'd find on any BNC, but the HD-BNC interface is optimised for higher frequencies. Rated to 18 GHz, this jack carries broadcast video, telecom, and instrumentation signals where the 75 Ohm line impedance matches the cable and equipment. The PTFE dielectric maintains a consistent 75 Ohm impedance through the connector body, critical at 18 GHz where a few picofarads of capacitance would create a reflection.
Mounting and Termination — Panel + PCB
The signal and shield connections terminate via solder tails that go through-hole on the PCB, right-angle orientation. The kit includes the connector and the mounting nut — no separate lockwasher or gasket in the bag, so if the panel needs a seal against moisture, you'll add that yourself.
Comparing the HD-BNC Siblings
The 034-1140-12G is the closest functional peer — same HD-BNC interface, same 75 Ohm impedance, same 18 GHz rating, same brass body with gold/nickel finish. The difference is the 034-1140-12G includes an isolated centre contact feature, which means the signal path is DC-blocked from the shield. If your circuit already has a DC block elsewhere, the 034-1030-12G saves the cost of the isolation; if you need the block built into the connector, the 034-1140-12G is the one. The 034-1118-12G is a male plug, not a jack — it terminates to a cable group (Belden 1855 A, 4855R) with a crimp shield and solder centre pin. That plug mates with this jack, so if you're building a cable assembly to plug into this bulkhead, the 034-1118-12G is the mating half.