Neutrik NBNC75BDD6X 75-Ohm BNC Cable Connector

Neutrik NBNC75BDD6X 75-Ohm BNC Cable Connector

The Neutrik NBNC75BDD6X is a rearTWIST UHD BNC male cable connector, a true 75-ohm termination for professional video coax. Neutrik’s rearTWIST design lets the connector be locked and released from the rear boot, which matters in the dense patch panels and equipment racks of broadcast work, where a conventional BNC’s coupling nut can be almost impossible to reach. The UHD variant’s insulator and centre pin geometry are engineered for low return loss at the high frequencies of HD and UHD video signals, including 12G-SDI workflows.

Key features

• True 75-ohm BNC male cable connector
• rearTWIST UHD design for high-density panels
• Crimp termination for centre pin and shield
• VSWR 1.06 or better up to 6GHz, per Neutrik
• Shield crimp size 4.53mm hex, per Neutrik
• Rated for over 1000 mating cycles, per Neutrik

Published electrical performance

Neutrik publishes a full electrical specification for this exact part. Impedance is 75 ohms, contact resistance is 3 milliohms or less at the inner contact and 2 milliohms or less at the outer, dielectric strength is 1.5kV DC, insulation resistance exceeds 5 gigaohms, and rated voltage is under 50V. Return loss performance is stated across the bands that matter for modern video: VSWR of 1.06 or better, over 30dB return loss, up to 6GHz; 1.13 or better, over 24dB, up to 12GHz; and 1.22 or better, over 20dB, up to 18GHz. That headroom is the point of the UHD design: it leaves reserve for the small impedance deviations that real cables pick up from bending and handling, instead of spending the entire error budget at the connector.

Cable match is part of the specification

A crimp BNC is only correct for the cables it is dimensioned for, and Neutrik publishes the matching list for this part. Suitable cables include Belden 1855A, with UHD-optimised options listed by Neutrik including Belden 4855P, CommScope 7538, Clark CD7523 and Gepco 4855R. Termination uses a 4.53mm hex crimp for the shield and the DIE-R-BNCX-PDG die set in Neutrik’s crimp tooling, per the manufacturer’s product guide. Using the specified die and a cable from the published list is what makes the finished termination meet the figures above; a connector crimped onto an unlisted cable is an unknown, whatever the connector itself can do.

Construction and assembly

The shell is brass with Neutrik’s Antraloy plating, the centre contact is brass with a gold-alloy plating, and the insert is polypropylene. Locking is by bayonet, cable anchoring is by jacket crimping, and the published temperature range runs from minus 30 to plus 85 degrees Celsius. Assembly follows Neutrik’s instructions for the part: prepare the cable to the stated strip dimensions, crimp the centre contact, seat the assembly, and crimp the ferrule over the shield. Inspect the finished connector for stray braid strands and a correctly seated pin before testing the completed cable on the signal it will actually carry.

For terminating the listed miniature and UHD coax cables in broadcast, studio and live video work, the NBNC75BDD6X is Neutrik’s specified rearTWIST UHD answer, with published figures to build to.