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BNC connector

 

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BNC connector


 
 



The BNC (bayonet Neill-Concelman) connector is a very common type of RF connectorRF connector

An RF connector is an electrical connector designed to work at radio frequencies in the multi-megahertz range....
 used for terminating coaxial cableCoaxial cable

Coaxial cable is an electrical cable consisting of a round conducting wire, surrounded by an insulating spacer, surrounded b...
.

Use

The BNC connector is used for RF signal connections, for analogAnalog video

Analog video is a term that can refer to any of three analog television transmissions signals....
 and Serial Digital InterfaceSerial Digital Interface

The Serial Digital Interface, standardized in ITU-R BT.656 and SMPTE 259M, is a digital video interface used for broadcast-g...
 video signals, amateur radioAmateur radio

Amateur radio, often called ham radio, is a hobby and public service enjoyed by about 3 million people throughout the ...
 antenna connections, aviation electronics and many other types of electronic test equipmentElectronic test equipment

Back to ElectronicsElectronic test equipment is used to create stimulus signals and capture responses from electronic D...
. It is an alternative to the RCA connectorRCA connector

An RCA jack, also referred to as a phono connector or CINCH/AV connector, is a type of electrical connector whic...
 when used for composite video on commercial video devices, although many consumer electronicsFacts About Consumer electronics

Consumer electronics are electronic equipment intended for use by everyday people....
 devices with RCA jacks can be used with BNC-only commercial video equipment via a simple adapter. BNC connectors were commonly used on 10base210BASE2

10BASE2 is a variant of Ethernet that uses thin coaxial cable , terminated with BNC connectors....
 thin EthernetEthernet

Ethernet is a large and diverse family of frame-based computer networking technologies for local area networks ....
 networks, both on cable interconnections and network cardNetwork card

A network card, network adapter or NIC is a piece of computer hardware designed to allow computers to communicat...
s, though these have largely been replaced by newer Ethernet devices whose wiring does not use coaxial cable. Some ARCNETARCNET

ARCNET is a local area network protocol, similar in purpose to Ethernet or Token Ring....
 networks use BNC-terminated coax.

Specifications

BNC connectors exist in 50 and 75 ohmOHM

Sorry, no overview for this topic
 versions. Originally all were 50 ohm and were used with cables of other impedances, the small mismatch being negligible at lower frequencies. The 75 ohm types can be recognized by the reduced or absent dielectric in the mating ends. The different versions are designed to mate with each other, although the impedance mismatch will lead to signal reflections. Typically, they are specified for use at frequencies up to 4 and 2 GHz, respectively.

NOTE. The physical sizes of the 50 and 75 ohmOHM

Sorry, no overview for this topic
 sockets are slightly different and can damage the "wrong" plugs.

History

The connector was named after its bayonet mountFacts About Bayonet mount

A bayonet mount or bayonet connector is a fastening mechanism that relies on mated surfaces; a male side with one or m...
 locking mechanism and its two inventors, Paul NeillPaul Neill

Engineer at Bell Labs in the 1940s and 1950s credited with helping to invent the BNC, TNC and Type N connectors used for Microwave...
 of Bell LabsBell Labs

Bell Laboratories was the main research and development arm of the United States Bell System....
 (inventor of the N connectorN connector

The N connector is a threaded RF connector used to join coaxial cables....
) and AmphenolAmphenol

Amphenol Corporation is one of the world's leading producers of electronic and fiber optic connectors, cable and interconnec...
 engineer Carl ConcelmanCarl Concelman

Carl Concelman was the electrical engineer who, while working for Amphenol, invented the C connector and teamed up with Paul...
 (inventor of the C connectorC connector

C connectors couple using two-stud bayonet-type locks....
), and is much smaller than both the N and the C connectors. Other backronymBackronym

A backronym or bacronym is a type of acronym that begins as an ordinary word, and is later interpreted as an acronym....
s the BNC has picked up over the years include: "Baby Neill-Concelman", "Baby N connectorFacts About N connector

The N connector is a threaded RF connector used to join coaxial cables....
", "British Naval Connector", "Bayonet Nut Connector".
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 (BSEE '36, PhD '63). He filed a patent in 1945 (granted 1951) while working at Hazeltine Electronics Corporation for a connector placed on coaxial cables that would minimize wave reflection/loss.

Similar connectors

A threaded version of the BNC connector, known as the TNC connector (for Threaded Neill-Concelman) is also available. It has superior performance to the BNC connector at microwaveMicrowave

Microwaves are electromagnetic waves with wavelengths longer than those of Terahertz wavelengths, but relatively short for ...
 frequencies.

BNC connectors are commonly used in NIMNim

Nim is a two-player mathematical game of strategy in which players take turns removing objects from distinct heaps....
 electronics, but they are now often replaced by LEMOLEMO

LEMO is both the name of an electronic and fibre optic connector manufacturer based in Switzerland, and the name commonly us...
 00 miniature connectors which allow for higher densities.
For higher voltages, MHVMHV connector Overview

The MHV connector is a type of RF connector used for terminating coaxial cable....
 and SHVSHV connector

The SHV connector is a type of RF connector used for terminating a coaxial cable....
 connectors are typically used. MHV connectors are easily mistaken for BNC connectors and can be made to mate with them by brute force. The SHV connector was developed as a safer alternative to MHV connectors and will not intermate with ordinary BNC connectors.

In USSR, BNC connectors were copied as SR-50 (Russian: ??-50) and SR-75 (Russian: ??-75) connectors. These connectors have slightly different dimensions (as a result of recalculating from Imperial to Metric system), but are generally interchangeable with BNC, sometimes with force applied.

Twin BNC connectors use the same bayonet latching shell as an ordinary BNC connector but contain two independent contact points (one male and one female), allowing the connection of a 78 ohm or 95 ohm shielded differential pairDifferential pair

Differential pair is a pair of conductors with special characteristics, used for differential signaling....
 such as RG-108A. They are capable of operation at 100 MHz and 100 volts. Twin BNC connectors will not intermate with ordinary BNC connectors.

TriaxialTriaxial cable

Triaxial Cable is a type of electrical cable similar to coaxial cable, but with the addition of an extra layer of insulation...
 connectors are a variant on BNC which carry both a signal and guard as well as ground conductor. These are used in sensitive electronic measurement systems, particularly of KeithleyKeithley Instruments

Keithley Instruments is a measurement and instrument company headquartered in Solon, Ohio....
 manufacture. Early ones were designed with just an extra inner conductor, but later tri-axial connectors also include a three-lug arrangement to rule out an accidental forced mating with a BNC connector. Adaptors exist to allow some interconnection possibilities between tri-ax and BNC connectors.