50 Ohm and 75 Ohm are Two Distinct Types of BNC Connectors

BNC cables and connectors are manufactured in 50 Ohm and 75 Ohm specification versions.Get more news aboutbnc coaxial cable connectors,you can vist our website!
75-ohm cables/connectors are made for high quality digital video (CCTV) and are able to scale their output depending on the input received.
75-ohm cables can also be effectively used on the older analog video formats, which makes them more versatile and flexible - as they can be used in any situation.
75 Ohm BNC cables/connectors are used when Low Loss of Signal is Especially Important.
50-ohm cables/connectors work well with old analog video formats. If you are looking for a high quality video output, 50 Ohm will not give you a high quality level.
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 and 75 Ohm coaxial cables are identified according to their impedance measured in Ohms, the unit that measures electrical resistance. The radio frequency signals that are transmitted down these cables carry an alternating current (AC) rather than direct current (DC). With AC signals, both the magnitude and phase of the transmitted signal are countered and contained by the cable as it flows down its length. The impedance rating for coaxial cable therefore comprises:

Coaxial cable is specifically designed to support signal transmission and is structured to balance resistance, capacitance, and inductance for consistent performance in radio frequency circuits. The composition of a specific coaxial cable will determine its impedance with the characteristic impedance of the cable down to the dielectric constant of the insulating layer and the radii of the outer and inner conductors.

Why 50 Ohm and 75 Ohm?

The use of 50 and 75 Ohms as standard characteristic impedances for coaxial cable for most radio frequency applications is essentially a compromise for optimal power handling and the lowest feasible signal loss. These key impedances were identified through extensive testing in the early 20th century. These experiments found though excellent voltage and power handling could be achieved with 30 Ohm cable, the lowest attenuation was achieved with 77 Ohm coax.

50 Ohm coaxial cable would therefore have a good power handling profile as well as low attenuation. Over the subsequent decades, 50 Ohm coax had come to the fore as the primary solution for cable with good power handling, especially for 100 watts or more. It is often used for antenna cables in applications that involve transmitters and transceivers across amateur and broadcast radio, cellular and wireless networking.
75 Ohm cable was preferable for applications that require low signal loss, capacitance, and signal distortion. It is the coaxial cable of choice for applications where an efficient signal transfer is needed with minimal loss. These cables are often used in applications where a connection is made to a receiver and primarily video applications, which are low power and do not require the power handling of 50 Ohm cable. Key applications include cable television, HDTV, and CCTV. 75 Ohm coax can also be used for coaxial digital audio making 75 Ohm coax capable of transferring audio, for example, in a home theater system.

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