Name | BNC |
---|---|
Type | RF coaxial connector |
Designer | Paul Neill, Carl Concelman, & Octavio M. Salati |
Design date | Patented 1951 |
Manufacturer | Various |
Diameter | Male: Female: (outer, typical) |
Cable | Coaxial |
Passband | Typically 0-3 GHz |
Physical connector | }} |
The BNC connector (Bayonet Neill–Concelman) is a common type of RF connector used for coaxial cable. It is used with radio, television, and other radio-frequency electronic equipment, test intstruments, video signals, and was once a popular computer network connector. BNC connectors are made to match the characteristic impedance of cable at either 50 ohms or 75 ohms. It is usually applied for frequencies below 3 GHz and voltages below 500 Volts. Similar connectors using the bayonet connection principle exist, and a threaded connector is also available.
The BNC connector is used for signal connections such as:
It is an alternative to the RCA connector when used for composite video on commercial video devices, although many consumer electronics devices with RCA jacks can be used with BNC-only commercial video equipment via a simple adapter. BNC connectors were commonly used on 10base2 thin Ethernet networks, both on cable interconnections and network cards. The TNC (threaded) connector is used for stable performance at higher frequencies than used with the BNC connector.
BNC connections can also be found in recording studios. Digital recording equipment uses the connection for synchronization of various components via the transmission of word clock timing signals.
The basis for the development of the BNC connector was largely the work of Octavio M. Salati, a graduate of the Moore School of Electrical Engineering of the University of Pennsylvania. In 1945, while working at Hazeltine Electronics Corporation, he filed a patent for a connector for coaxial cables that would minimize wave reflection/loss. The patent was granted in 1951.
Video and DS3 Telco central office applications primarily use 75 ohm BNC connectors, where as 50 ohm connectors are used for data and RF. Many VHF receivers used 75 ohm antenna inputs, so they often used 75 ohm BNC connectors.
At frequencies below 10 MHz the impedance mismatch between a 50 ohm connector or cable and a 75 ohm one has negligible effects. BNC connectors were thus originally made only in 50 ohm versions, for use with any impedance of cable. Above this frequency, however, the mismatch becomes progressively more significant and can lead to signal reflections.
They are usually light weight, made with stainless steel, and have screw driver type plastic handle grips for applying rotating torque. Their shafts are usually double the length of a standard screw driver.
BNC tools help in safely, efficiently and quickly accessing BNC connectors, in jack fields. Using BNC tools also minimizes risk of accidentally disconnecting other connectors close by.
Category:Coaxial connectors Category:Television terminology Category:Audiovisual connectors Category:Analog video connectors
da:BNC de:BNC-Steckverbinder et:BNC-konnektor es:Conector BNC fa:رابط بیانسی fr:Connecteur BNC it:Connettore BNC he:מחבר RF#BNC my:BNC connector nl:BNC connector ja:コネクタ#同軸コネクタ pl:BNC pt:BNC ru:BNC-коннектор su:Konéktor BNC fi:BNC-liitin sv:Bayonet Neill-Concelman th:ขั้วต่อบีเอ็นซี zh:BNC连接器This text is licensed under the Creative Commons CC-BY-SA License. This text was originally published on Wikipedia and was developed by the Wikipedia community.
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