Adapter Fme
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Bnc Connector
Use
The BNC connector is used for RF signal connections, for analog and Serial Digital Interface video signals, amateur radio antenna connections, aviation electronics (avionics) and many other types of electronic test equipment. 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used on 10base2 thin Ethernet networks, both on cable interconnections and network cards, though these have largely been replaced by newer Ethernet devices whose wiring does not use coaxial cable. Some ARCNET networks use BNC-terminated coax.
Specifications
BNC connectors exist in 50 and 75 ohm 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 sometimes 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 in the cable may lead to signal reflections. Typically, they are specified for use at frequencies up to 4 and 2 GHz, respectively.
75 ohm BNC Connectors are primarily used for video and DS3 Telco central office applications whereas 50 ohm are used for data and RF. There was a convention in the BBC that BNC connectors used for video were always 50 ohm probably because a stray 50 ohm BNC plug would damage a 75 ohm socket if connected in error. Many VHF receivers used 75 ohm antenna inputs, so they often used 75 ohm BNC connectors.
History
The connector was named after its bayonet mount locking mechanism and its two inventors, Paul Neill of Bell Labs (inventor of the N connector) and Amphenol engineer Carl Concelman (inventor of the C connector). Other backronyms the BNC has picked up over the years include: aby Neill-Concelman, aby N connector, ritish Naval Connector, ayonet Nut Connector, ayonet Naval 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
The BNC connector is much smaller than the earlier N or the C 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 microwave frequencies.
Triaxial BNC connector
BNC connectors are commonly used in NIM electronics, but they are now often replaced by LEMO 00 miniature connectors which allow for higher densities. For higher voltages, MHV and SHV 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 the 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 (also known as twinax) 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 pair 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.
Triaxial (also known as triax) 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 Keithley manufacture.[citation needed] 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.
Female BNC connector
Cables with BNC connectors
Adapter between a female BNC connector and banana plugs
Pulse generators with BNC connectors and cables
Male 75 ohm BNC connector
See also
BNC inserter/remover tool
References
Wikimedia Commons has media related to: BNC connectors
Please help improve this article by adding reliable references. Unsourced material may be challenged and removed. (May 2008)
^ Amphenol Connex - BNC Connector specifications
^ Electrical connector. US Patent 2,540,012 by Octavio M. Salati
^ Amphenol RF - Twin BNC connector series
v d e
RF connectors (coaxial)
APC-7 BNC C F FME Hirose U.FL IPX Motorola MCX MMCX N QLS QMA/QN RCA SMA SMB SMC Twin-lead TNC TV aerial plug UHF / Mini-UHF
Variations and alternate names: 2.9 mm (SMA) 7 mm Triax / Triaxial Twin BNC / Twinax (BNC) IPEX MHF AMC (UFL) SnapN RP-TNC RP-SMA
Old or seldom used: EIA GR LEMO 00 Musa
See also: Radio frequency Radio spectrum Audio and video connectors Audio and video interfaces and connectors
v d e
Audio and video connectors
Single conductor audio
Binding post Banana plug Fahnestock clip
Analog audio
TRS XLR DIN / Mini-DIN D-sub Speakon
Digital audio
BNC S/PDIF TosLink XLR D-sub
Video
DVI / Mini-DVI / Micro-DVI DMS-59 / LFH VGA / Mini-VGA DFP BNC DIN / Mini-DIN DB13W3 D-Terminal
Audio and Video
RCA ADC Belling-Lee DisplayPort / Mini DisplayPort EVC F HDMI P&D SCART TRS
Visual charts
List of video connectors
v d e
Audio and Video Interfaces and Connectors
Audio Only
Analog
Interface: PC System Design Guide Connectors: TRS 3.5mm
Digital
Interface: S/PDIF Connectors: RCA Jack (Coaxial), TOSLINK (Optical), BNC
Video Only
Analog
Interface: VGA Connectors: DB-15 Interface: Composite Connectors: RCA jack yellow Interface: S-Video Connectors: Mini-DIN 4 Pin Interface: Component Connectors: RCA Jacks 3 Interface: Composite, S-Video, and Component Connectors: VIVO using Mini-DIN 9 Pin
Digital and
Analog
Interface: DVI Connectors: DVI
Video and Audio
Digital
Interface: HDMI Connectors: HDMI connector Interface: DisplayPort Connectors: DisplayPort connector
Categories: Coaxial connectorsHidden categories: All articles with unsourced statements | Articles with unsourced statements from February 2009 | Articles needing additional references from May 2008 | All articles needing additional references
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