BNC connectors What is a BNC connector? Application of BNC connectors
BNC Connectors created in the early forties by Amfenol together with Bell Labs, the developers were Paull Neill and Carl Councilman, hence the name BNS-bayonet Neill-Conceiman and it means an electrical connector with locking.
bnc rg connector There are several types, which differ mainly in the way of fixing the central core to the braid. They come with soldering, wrapping, crimping parts. Subtypes can also be used: BNC-F with threaded fastening, BNC-T for connecting network and computer network cards, BNC-I for splicing sections of coaxial cable.
Features of BNC Rexant connectors
A BNC connector is a coaxial line, which is filled with a dielectric, a resistance from 50 to 75 ohms and is intended for connecting a coaxial cable to an equipment connector. 50-ohm ones operate at frequencies up to 11 GHz, 75-ohm ones up to 4 GHz and are used in equipment where low signal distortion, that is measuring instruments.
There are quite a lot of manufacturing companies, but when you go into stores to buy bnc connectors and ask about quality, they recommend BNC connectors Rexant. If you go to the website of this company’s online store, you can find any parts you are interested in; there is a wide variety of connectors. It is more profitable to purchase online because the price is cheaper and delivery is fast. BNC Recant connectors are reliable, do not break for a long time, they are sealed and have a good connection.
What are they used for? BNC connectors Rexant
BNC connectors exist for connecting a coaxial cable to various radio-electronic devices via a bnc connector and can be compressor, crimp type, bnc for screw:
1.BNC compressor type connector, which is used in radio communications. Here the connection occurs using a plastic sleeve, which is snapped between the metal part of the housing and the cable sheath, thereby achieving tightness of the parts and reliable connection. A special crimping or trimming tool is used. This is the most reliable connection to date.
2.BNC connector with crimp connection. This connection is mainly used for CCTV BNC, connecting video cameras and similar equipment.
This connection requires precise sizing of the crimping tool. Part of the cable is stripped so that the bnc connector is crimped and the cable is connected tightly and efficiently, then the wire insulation is protected, the cable is laid under the spring-loaded part and the bnc connector is turned several times with the cable, the insulation is cut. Next, the contact is put on the central core, we install a steel tube on bnc cable connector and clamp.
3. BNC screw connectors are designed for connecting monitors, video cameras or DVRs with a 50-75 Ohm cable and a diameter of 7mm.
The connection occurs in this way: the cable is clamped using a bnc screw type connector, with a metal cap and a spring at the end, which ensure a reliable connection and tightness, protect the cable from external damage and kinks. The easiest option to use and is not inferior to others in reliability, for example bnc connectors for video surveillance.
Where are BNC Rexant connectors used?
BNC plug The connector is used in many industries, but mainly in commercial and industrial equipment and the commercial sector. Used for connection radio-electronic devices and creation of Internet networks such as 10 BASE 2. Installed in various equipment:
1.measuring instruments, for example an oscilloscope for measuring amplitude voltage fluctuations.
2. digital video equipment: recorders, household equipment, but bnc connector not applicable everywhere.
3.antennas and radio transmitters.
4.aviation and test equipment.
Recant BNC connectors are found wide application and help people at home and at work connect the necessary equipment.
For connecting various electronic devices, as well as for connecting cables Small units called connectors or connectors are used between each other. Exists a large number of connector designs, but in modern technology to work with high-frequency signals, coaxial connectors are used, designed to work with cables that have a central core and braided shielding. BNC screw connector is one of the most common modifications high frequency connectors.
Types of BNC connectors
The abbreviation BNC includes the word bayonet, which means bayonet, and the first letters of the surnames of the inventors Neil and Conselman. Each connector of this type, regardless of design features consists of two parts. These are the male and female parts, called male and female. The female part is usually firmly mounted on the panel of the electronic device, and the male part is at the end of the cable. In this way, remote devices are connected to each other. In cases where it is necessary to connect two cables, the plug and socket parts are fixed at the ends of the cable lines.
BNC connectors in one of the versions have a spring-loaded lock. The plug part, thanks to the spring, is forcefully inserted into the socket part and then rotates clockwise, while the protrusion on the socket fits into the groove of the plug and, after turning, firmly fixes the connection. To break the connection, the male part of the connector must be turned in the opposite direction and then removed from the female part.
This connection is very reliable and is not afraid of strong vibrations.
Structurally, BNC connectors have several varieties:
- BNC connector with cable soldering
- Compression BNC connector
- Screw connector
- BNC connector with header
- Connector splitter
The plug part of such a connector consists of a central pin, to which the cable core is connected and the signal is transmitted, and an outer cup (sleeve). The glass is fixed on the shielding braid of the cable. The BNC solder connector provides the most reliable connection. The cable core is inserted into the hollow channel of the pin and soldered. Depending on the design of the connector, the shielding braid can be soldered to a special petal or crimped with a metal strip. When laying cable lines, when it is necessary to connect two cables, this type of cable cutting is used. When using the correct solder, oxidation and destruction of the soldering joint does not occur under any operating conditions.
Some modifications of connectors have a central pin to which the cable core is not soldered, but is clamped under a screw. Such connectors much easier to install, since a soldering iron is not required, and therefore no 220 V network is required. The stripped central core of the coaxial cable enters the pin channel and is tightened with a screw. A screw-type BNC connector is not considered a reliable connection because contact failure may occur. Such connectors are never installed on portable equipment, since vibration weakens the screw thread and the contact may disappear completely.
A cable with a BNC connector should not be tightened, as this may lead to loss of contact.
For rigid connection of a cable with a compression connector, it is used special tool. With its help, the cable is inserted into the sleeve, which is then crimped. The connectors are made of brass and have a nickel coating, which allows the use of such a connection in complex weather conditions. Crimping the BNC connector provides a reliable connection, but the principle itself excludes reuse, because the sleeve is deformed.
Types of connectors
The simplest and cheapest coaxial connector is the BNC-F design. Such a connector consists of a sleeve with internal thread, and nuts. The role of the central pin is played by the core of the coaxial cable itself. Removed from the wire plastic insulation and the sleeve is screwed onto the screen with force so that the central core protrudes 6-8 mm beyond the edge of the nut. The resulting pin part is screwed onto the socket using a nut, and the cable core enters the contact hole.
Such connectors are often used to connect antenna cable to TVs. This type of connector provides normal work devices at frequencies up to 2.0 GHz.
There is often a need to connect a cable to a bayonet connector quickly and easily, without resorting to soldering or crimping. A BNC connector with a header is perfect for this purpose. This is a combined adapter, on one side of which there is the connector itself, and on the other terminal block REXANT type with two lamellas for screws. The screw connection ensures high reliability and quality of contact.
The BNC-T connector is a splitter in which one high-frequency signal can be sent to two devices simultaneously. The connector is shaped like the letter “T” and includes one male part and two female parts. If the tee is used with only one device, then to match the wave impedance, a special plug is installed on the free outlet. It contains a 50 or 75 ohm resistor, depending on the type of cable.
Design of high frequency connectors
The body of connectors designed to work with coaxial cables is usually made of brass and has a nickel coating. The housings of domestic CP connectors were also made of brass and silver-plated. The central pin of the connector is plated with silver or gold. Gold does not oxidize in any way gas environments, so the contact turns out to be very reliable.
The washer into which the pin is pressed is made of various polymer materials. It can be polyethylene, polystyrene or fluoroplastic (Teflon). Washers for solder connectors are always made only from Teflon, since other material softens when heated and the pin can move to the side.
Application of BNC connectors
BNCconnectors are widely used in various areas electronics:
- Reception and transmission of data in digital and analogue interfaces
- Work in cellular communication systems
- Military and aerospace equipment
- Connecting CCTV cameras
- Instrumentation and control equipment
BNC connectors, when working with a 75 ohm cable, provide data exchange at a frequency of up to 2.0 GHz, and with a 50 ohm cable, the frequency can be doubled and reach 4.0 GHz.
Very often such connectors are installed on video cameras. In order for the connection to the DVR to be reliable, choose a connector where the cable core is soldered to the central pin or use an adapter connector with a screw block. Almost all measuring instruments, including oscilloscopes, generators or signal spectrum analyzers, are connected via cable lines with BNC. In this way it is possible to organize workplace for setting up or repairing any electronic equipment.
Conclusion
According to experts, the best connectors for transmitting high-frequency signals are Soviet-made connectors SR-50 and SR-75. They were developed and used for military equipment and have high reliability and minimal signal loss. They are silver plated and can still be purchased on radio markets.
BNC crimp connector
The BNC crimp connector is a high frequency coaxial connector with a bayonet connection. Used for frequencies:
4 Hz at a resistance of 75 Ohms,
1 Hz at a resistance of 50 Ohms.
At the same time, the loss of signal quality is minimal.
There are several options for mounting sockets and plugs: on a board, coaxial cable, dashboard. For crimping, the BNC connector is attached to a wire with a diameter of up to 7 mm. Other fixing options are soldering and screw clamping.
The range includes a male BNC connector for crimping various designs: linear and angular (90 degrees). Part of the case with gold or nickel plating follows the shape of a hexagon. Thanks to this, holding the element with a key is simple and convenient. The shock-absorbing spring in the housing prevents the cable from kinking, extending its service life and preserving high quality signal. There is also a protective cap and support for mounting on the board. The housing of the sockets can be made of plastic or metal.
Manufacturers of BNC connectors use the following materials for their manufacture:
Nickel-plated zinc or plastic (body),
brass with gold plating (central contact),
polyoxymethylene (insulator),
nickel-plated brass (crimp sleeve),
nickel plated iron (ring gasket),
PVC (rubber gasket).
Bayonet plugs and sockets have been in use for decades. Therefore, their effectiveness and reliability have been proven by many years of use in a wide variety of conditions.
BNC compression connector
The highest mechanical and electrical characteristics has a BNC compression connector. For fixation, it uses a plastic sleeve that evenly clamps the cable around the circumference. Advantages of this method:
Reliable mechanical connection,
complete sealing on the cable side,
complete waterproofing on the nut side thanks to the rubber ring,
maximum screening.
High-quality materials for BNC compression connectors - brass, polymer and others - allow the products to be used for outdoor installation. They are resistant to moisture, ultraviolet radiation and other adverse external factors.
Installation of the compression element is as simple as the crimp-on models. However, the compression fastening mechanism is more reliable.
BNC connector: manufacturer REXANT or PROCONNECT
The reliability of contact between the wire and the connector largely determines the quality of the network. Therefore, it is important to choose the right BNC connector when installing. The manufacturer offers plugs and sockets of various designs. Products are manufactured under the REXANT and PROCONNECT brands. A wide range of models allows you to select equipment for operation in any conditions.
The quality of products is carefully controlled. All manufacturer's products have the necessary certificates of conformity.
What is BNC?
BNC connector or BNC connector / Bayonet Neill-Concelman- This general type RF connector, which is used when installing coaxial cable. This type connectors are actively used in radio-video equipment, where the signal is transmitted via a radio frequency cable. The BNC connector is limited in its use by frequency and voltage, for example, the maximum permissible frequency is 3 GHz, and the voltage should be no more than 500 V.
The history of the BNC connector
The creators of this connector are considered to be Paul Neill and Carl Concelman, who decided to name their creation after the Bayonet locking mechanism, and of course, to perpetuate their work by adding the first letter of their names to the name.
The BNC connector owes its further development and improvement to a graduate of the University of Pennsylvania, Octavio M. Salati. It was he who, in 1945, as an employee of Hazeltine Electronics Corporation, received a patent for a connector for a coaxial cable, which differed from analogues existing at that time in its very low attenuation coefficient.
Practical use of BNC connectors
The BNC connector is considered an excellent alternative to the RCA connector, which is used to organize the reception and transmission of composite video signals in TVs and DVD players. However, today the BNC connector is increasingly used in commercial and industrial equipment.
It is possible to use cables with BNC connectors to connect radio-electronic devices such as oscilloscopes, signal generators, etc. At the same time, it is also used for organizing computer networks Ethernet standard 10BASE2. At the same time, this type of connector is also found in recording studios, as it allows you to synchronize various components of digital recording devices.
Currently BNC connectors are used:
In analog and digital video signal transmission interfaces;
In amateur radio equipment such as antennas, radio transmitters, etc.;
In aviation electronics;
For experimental equipment.
BNC connector types and compatibility
There are two main types of BNC connectors:
For cable with wave impedance 50 Ohm (50 Ohm BNC) for frequencies up to 4 GHz;
For 75 Ohm cable (75 Ohm BNC) for frequencies up to 2 GHz.
In this case, the 75 Ohm connector is used primarily for transmitting a video signal, and the second type of BNC connectors is intended mainly for data transmission. In order to be able to distinguish connectors by appearance The US Air Force has entered into an agreement with manufacturers of connectors in this group on special markings. Thus, it was possible to significantly reduce losses that led to large data losses.
Connector types
We have talked many times about the various components that make up an analog video surveillance system, but have repeatedly overlooked younger brother, without whose participation more than one such system would not have taken place. We will talk about BNC connectors, a special connector that allows you to combine coaxial cables with a video camera and DVR.
Principle of operation
A BNC connector with a characteristic impedance of 75 ohms is actively used to transmit a video signal from a video camera via a coaxial cable to the BNC “Socket or Female” connector of the DVR.
BNC socket.
The outer part of the connector has small grooves, thanks to which the connector, passing through the small recesses of the BNC socket, is securely fastened, while the central rod fits into the socket of the socket. The connector is secured in the socket by a slight clockwise turn.
Types and types of installation of BNC connectors.
According to the type of fastening of the coaxial cable, BNC connectors are:
- Screw-on
- With terminal block
- For crimping (compression)
- Solderable
- Screw-on
BNC screw connector
BNC screw connector – fixes the central core of the coaxial cable with a screw, and the braid is clamped in a special holder. Important: The braid and the central core must not touch.
On video: Installing a BNC screw connector
BNC connector with terminal block
The connector with a terminal block is easy to use, it is extremely easy to install such a connector, the braid is inserted into the minus, and the central core into the +. The only drawback of this connector is the absence of a holder spring, which prevents the cable from becoming loose. For this reason, it is reasonable to install such adapters on the video camera side in distribution box. On the DVR side, such a connector will not last long, it has been tested for years.
The crimp connector is one of the most reliable methods of connecting to a coaxial cable; the central core of the cable is placed in a brass core, and a crimp cap is placed on top of the cable, all this is combined with the connector body and crimped with a special tool.
On video: How to crimp a compression connector
BNC solder
BNC solder connectors are extremely reliable as compression connectors. In design, they resemble screw connectors, but the central core is soldered to the core. The braid can simply be clamped or soldered, since you already have a soldering iron in your hands. One of the disadvantages of such connectors is the inconvenience of installation at a height; while compression connectors can still be contrived to crimp the cable, this is unlikely to be possible with a wire iron at a height.
Screw-on BNC connector.
This connector is suitable for TV cable RG-6, since only its rigidity and the thickness of the central core allows the connector to be secured. The connection is quite reliable and resistant to loosening.
Cable for BNC connector
Any RG-6 type coaxial cable is suitable for the BNC connector. For ease of installation over short distances, it is more rational to use combined KVK cables. Such a cable not only has a coaxial core with a braid, but also carries two power cores, which greatly simplifies the installation of a video camera, since the signal and power are transmitted through one cable
KVK 2 x 0.5
This wire is the cheapest of the combined cables; it carries power cores with a cross-section of 0.5 mm, the central core should have a thickness of RK-75, which in practice is far from the case. With kvk-2x0.5, people often cheat, either the power cores are 0.3, or the central one is as thick as a hair. The disadvantage of the cable is that it is not thick enough; it is not clamped by a spring at all; as a result, such a cable moves freely inside a metal cap with a spring.
