BNC Coupler (Female to Female)

Connector anatomy

BNC

• 01 Centre conductor Carries the video signal — the copper wire at the very core of the coaxial cable.
• 02 Bayonet lock Push and give it a quarter turn to lock. That is what keeps a camera connected on a pole in the wind.
• 03 Braided shield The copper braid surrounds the core and holds the cable's impedance constant along the whole run (50 or 75 ohm, depending on the cable).
• 04 50Ω vs 75Ω BNC connectors come in two incompatible impedances: 50 ohm (RF/data standard) and 75 ohm (video/broadcast standard). Mixing them causes real signal loss (about 5% per mismatch point) — a common mistake when a 50 ohm BNC cable ends up on a 75 ohm CCTV run.
• 05 Strain-relief boot Stops the wires flexing where they leave the plug — the exact point most cables fail.
• 06 Outer jacket The outer sheath protecting the conductors inside from abrasion and moisture.

Technical illustration, not a photo of the actual product