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Applications And Characteristics OF BNC Connectors

Applications And Characteristics OF BNC Connectors

November 07 , 2023 0

I.What Is A BNC Connector

The BNC connector is very similar to the B and C terminals. A threaded connector TNC and BNC has better performance in the microwave band than BNC.

The BNC connector is available in 50 ohm and 75 ohm versions. When 50 ohm connectors and other impedance cables are connected, transmission errors are less likely. Different versions of the connector are compatible with each other, but if the cable impedance is different, the signal may be reflected. Usually BNC connectors can be used at 4GHz or 2GHz. 75 ohm connectors are used for video and DS3 connections to telephone company central offices, while 50 ohm connectors are used for data and RF transmission. A 50 ohm plug incorrectly attached to a 75 ohm socket may damage the socket. 75 ohm connectors are used in VHF applications.

BNC connectors are used for RF signal transmission, including analog or digital video signal transmission, amateur radio equipment antenna connection, avionics and other electronic test equipment connection. In the field of consumer electronics, the BNC connector used for video signal transmission has been replaced by the RCA terminal, which can be used on devices with only BNC connectors through a simple adapter.

BNC terminals have been widely used in 10base2 Ethernet, because the coaxial cable is replaced by twisted pair, it is difficult to see the network card with BNC terminals. Some ARCNET networks make BNC terminating coaxial cables.

The BNC connector is suitable for frequency range from 0 to 4GHz and is a coaxial cable connector with bayonet connection mechanism for low power. This connector can be quickly connected and separated, has the characteristics of reliable connection, good vibration resistance, convenient connection and separation, suitable for frequent connection and separation occasions, widely used in radio equipment and test instruments to connect coaxial RF cables.

The characteristic impedance is very important, otherwise it will cause mismatch. When the impedance is matched, the maximum output power can be obtained and the equipment utilization efficiency is the highest. When the impedance is not matched, the output effective power will be reduced. Impedance matching occurs when the external impedance is equal to the internal impedance of the device.

The BNC connector must be connected to both ends of each cable. The BNC cable connector consists of a center pin, a jacket and a cassette. It includes three parts: BNC connector base, jacket and probe. The BNC connector gets its name from its locking method and its inventors Paul Neal of Bell LABS (who invented the N terminal) and Carl Konseman of Amphenol Corporation (who invented the C terminal).

The NC connector is very similar to the B and C terminals. A Threaded connector TNC(Threaded Neill-Concelman) has better performance in microwave bands than BNC.

In the field of consumer electronics, the BNC connector used for video signal transmission has been replaced by the RCA terminal, which can be used on devices with only BNC connectors through a simple adapter. BNC terminals have been widely used in 10base2 Ethernet, because the coaxial cable is replaced by twisted pair, it is difficult to see the network card with BNC terminals. Some ARCNET networks make BNC terminating coaxial cables.

II.Features OF BNC Connectors

1.Characteristic Impedance

The characteristic impedance of the BNC RF connector is the most used of 50Ω and 75Ω. Many series of connectors are available in both 50Ω and 75Ω sizes. Generally speaking, 50Ω connectors are used on high frequency, high performance products; 75Ω connectors use products with lower frequencies, most of which are below 4GHz, especially in consumer electronics video. Users should choose a connector that matches their impedance according to their own products. If the user uses 75Ω RG 59 Cable, the 75Ω connector should be selected.

2.Frequency

Each RF connector has a frequency range, and users should understand their own product operating frequency to choose the connector. Choosing a connector lower than the required operating frequency will affect the electrical performance of the whole machine; Or choose expensive high-precision and high-frequency connectors to cause waste. It should be noted that the frequency difference between connectors designed by different companies is relatively large, and the frequency of use of inferior products is far from meeting the industry requirements. When selecting the connector, the user should confirm the electrical performance description of the product.

3.VSWR

VSWR is one of the most important performance indicators of RF connectors, is a measure of the amount of signal returned from the connector standard, it is a vector unit including amplitude and phase components. The VSWR of the same type of connector is not the same at different frequencies of use. In general, the higher the frequency of use, the higher the VSWR. If the user wants to know the VWSR of the connector at a particular frequency, they can ask an electronics engineer, etc.

III.Common Types OF BNC Connectors

BNC-T type head, used to connect the computer network card and the cable in the network;
BNC bucket connector for connecting two thin cables into one longer cable;
BNC cable connector for welding or screwing at the end of the cable;
The BNC terminator is used to prevent the signal from reflecting back after reaching the cable break and causing interference. A terminator is a special connector that has a resistance carefully selected to match the characteristics of the network cable. Every terminal must be grounded.

IV.How To Determine The Quality OF The BNC Connector

First: Through the surface of the product, the bright and delicate coating is better, the higher the purity of copper, the brighter, some products are bright outside, but it is iron.
Second: the adsorption test of the magnet, under normal circumstances, only the bayonet spring and the tail spring are with iron materials; The clamp, pin and casing are made of copper, and the other parts are zinc alloy.
Third: Scrape the surface coating to see the material: scrape the surface coating through the blade and other sharp tools to see the material intuitively, and visually compare the product material by scraping the wire clip, pin, shield sleeve coating.

V.BNC Connector Installation Mode

In general, BNC connectors are divided into two types: solderless and solderless

Of course, the welding type is fixed with a soldering iron and solder, which is the most common form of domestic use at present, the shape of the welding can be divided into British and American two, according to the material is divided into core, zinc alloy and copper.
Solder-free type is divided into two kinds, one is tightened with screws, that is, the middle axis has a screw for quick link, the other is relatively high on the cable, there are straight screw type, cold press type and extrusion type.