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BNC Cables 50 Ohm & 75 Ohm Distinctions, Applications, Connectors

        50 Ohm and 75 Ohm are Two Distinct Types of BNC Connectors & Cables:

        • BNC connectors are manufactured in 50 Ohm and 75 Ohm specification versions.
        • The two types of connectors are physically different from each other.  Connection of the two types of connectors is possible but not best practice:  Mixing will not give you the best output.
        • 50 Ohm BNC connectors are used with 50 Ohm cables.  75 Ohm connectors are used with 75 Ohm cables. 
        • 50-ohm cables/connectors work well with old analogue video formats.  If you are looking for a high quality video output, 50 Ohm will not give you a high quality level.
        • 75-ohm cables/connectors are made for high quality digital video and are able to scale their output depending on the input received. They can also be effectively used on the older analogue video formats, which makes them more versatile and flexible - as they can be used in any situation.

        [caption id="attachment_8120" align="alignnone" width="417"]BNC 75 Ohm & 50 Ohm Connector Types: Male & Female BNC 75 Ohm & 50 Ohm Connector Types: Male & Female[/caption]

        75 Ohm BNC cables/connectors are Used when Low Loss of Signal is Especially Important.

        75 Ohm BNC applications are mostly in the fields of:

        • Satellite, high definition televisions, and cable TV receiver box.
        • AM/FM radio receivers
        • Police scanners.
        • RG-179 coaxial cable uses the 75 Ohm BNC connector type and it is used in high temperature situations.

        Applications of 75 Ohm BNC Cables using RG-179

        • RG-179 coaxial cable uses a 75 Ohm BNC connector
        • Is specially designed for high temperature environments:  With a TFE taped outer jacket. It can easily withstand in the temperature up to 200 degree Celsius.
        • RG-179 is widely used in such high temperature environment applications as:
          • Medical equipment in hospitals and clinics
          • Video security cameras for safety purposes
          • Audio security systems.

        Other applications of BNC Cables by Coax Type

        There are wide range applications of the BNC connectors. It has different applications according to the type of the connector.

        • RG-59 coaxial cable are used to transmit video signals from a CCTV camera to the monitor room. RG-59 coaxial cables use 75 Ohm BNC connector.
        • RG58 coaxial cable use 50 Ohm BNC connector and it has wide range of applications due to its performance. This cable is lower priced.
        • RG-174 coaxial cable also use 50 ohm BNC connector, it is very thin and has wide applications in GPS navigations antennas of the cars and many vehicles.
        • RG-213 coaxial cable is also has 50 Ohm BNC connector, and it used where high power handling is needed:  RG-213 can handle 1000 watts and more. RG-213 coaxial cable is the thickest coax of BNC coax types:  It is  almost half an inch thick.

        BNC Connector's Composition

        • 75 Ohm BNC connectors
          • Use teflon as the dialectric
          • Their outer spring fingers are directed by air.
          • Their pin has a very consistent diameter, and this applies both at the front and back. 
        • 75 Ohm BNC connectors
          • Use delirin in place of teflon.
          • The diameter of their center pins are not consistent: It tends to increase as you get nearer to the crimp region.

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