Beryllium copper (gold plated) is used on the center contact for its superior spring characteristics (Center contact: solder). 75 ohm BNC Jack Plug (BCJ-D25HD,BCJ-D25HW,BCJ-D33UHD) Key Features and Benefits
Return loss for BCJ-D: 20 dB @ 3 GHz, 15 dB @ 6 GHz, 10 dB @ 12