BNC connector is a connector for coaxial cable, which is widely used in communication systems.
Structure of the BNC connector
BNC connectors include:
Bnc-t head for connecting computer network card and cable in the network;
BNC bucket connector for connecting two cables into a longer cable;
BNC cable connector, used for welding or screwing on the end of the cable;
BNC terminator is used to prevent interference caused by signal reflected back after reaching cable break. The terminator is a special connector with a carefully selected resistance to match the characteristics of the network cable. Each terminal must be grounded.
Main features of the BNC connector
1, characteristic impedance
The characteristic impedance of THE BNC connector is more than 50 ω and 75 ω. Many series of BNC connectors are available in both 50 ω and 75 ω specifications.
In general, 50 ω BNC connectors are used for high frequency, high performance products; 75 ω BNC connectors are used for products with lower frequencies, mostly below 4GHz, especially for consumer electronic video. Users should choose the BNC connector that matches their impedance according to their product.
2, frequency,
Each TYPE of BNC connector has a frequency range, and users need to know their product operating frequency to choose the connector. Choosing connectors with lower working frequency than required will affect the electrical performance of the whole machine; Or choose expensive high-precision high-frequency connectors resulting in waste.
3 pattern, VSWR
VSWR is one of the most important performance indicators of THE BNC connector. It is a measurement standard for the amount of signal returned from the connector. It is a vector unit including amplitude and phase components. The VSWR of the same connector is different at different frequencies. In general, the higher the frequency of use, the higher the VSWR.
BNC connector quality:
1, BNC connector through the surface of the product, the coating is fine and bright, the higher the purity of copper is bright, some products are bright outside, but it is iron.
2, magnet adsorption test, generally only bayonet spring and tail spring with iron material; Wire clamp, pin and casing are made of copper, and other parts are made of zinc alloy
3. Scrape the surface coating to see the material: scrape the coating on the surface of the blade and other sharp tools to see the material intuitively, and intuitively compare the product material by scraping the wire clip, pin and shield sleeve coating.
4. In addition to the above methods, you can also prepare a good quality female head to try.
Post time: Jan-13-2022