The Connex BNC connectors are made to a high quality level. Medium size coaxial connectors with bayonet lock. 50 ohm impedance for applications up to 4 GHz and 75 ohm impedance up to 2 GHz. 75 Ohm Series Within the internationally standardized BNC mating face dimensions, a perfect 75 ohm characteristic impedance cannot be realized. However, at frequencies up to 1000 MHz, the small impedance deviation is negligible for practical applications. Connex true 75 ohm connectors with a typical VSWR reading of 1.06:1 at 2000 MHz are identified by an asterisk following the part number. All 75 ohm BNC connectors and 50 ohm BNC connectors are intermateable without restrictions. Adapter, BNC Jack to BNC Jack, Bulkhead, 50 Ohms, Isolated