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BNC Connector,impedence With 50Ω And 75Ω Welding Method

Edit: Yuhoo Electronic Technology (Dongguan) Co..Ltd    Date: Jul 21, 2017

BNC connector,impedence with 50Ω and 75Ω, is a connector for coaxial cable, first of all, we must know, BNC connector,impedence with 50Ω and 75Ω is usually divided into two kinds: one is 50 ohms, there is a 75 ohm.

Under normal circumstances: communication reception (small signal) is often used 75 ohms; communication transmission (high power) is 50 ohms. Monitoring system video signal is the former, so the use of 75 ohm impedance. The same specifications (such as are -7 or -5 or -3) core wire insulation layer diameter the same, but the center of the conductor diameter is not the same: 50 ohm diameter than 75 ohm thick!

For the socket: 50 ohm center conductor aperture is greater than 75 ohms, that is 75 ohms hole smaller.

For plugs: 50 ohm center conductor diameter is greater than 75 ohms, that is 75 ohm core smaller.

So that if the impedance of the plug and socket does not match, in addition to increased insertion loss, it can cause poor contact (for example, 50 ohm seat with 75 m plug), or in turn cause the insertion too tight (for example, 75 ohm 50 ohm plug).

Because most are not professional to engage in monitoring, so simply do not know this problem, and even many manufacturers and businesses do not distinguish between indiscriminate use, there will be bad contact, easy to damage the situation.

BNC connector,impedence with 50Ω and 75Ω with crimp, assembled and welded, the production of crimp BNC connector,impedence with 50Ω and 75Ω requires a special clamp and electric knife. Crimping BNC connector,impedence with 50Ω and 75Ω production steps are as follows:

Stripping

Coaxial cable from outside to inside, respectively, for the protection of rubber, metal shielded cable (grounding shielded wire), milky white transparent insulation layer and core (signal line), the core by one or several copper wire, metal shielded cable is made of metal Line woven metal mesh, between the inner and outer wire filled with milky white transparent insulator, inner and outer wire to maintain coaxial solid known as coaxial cable. Stripping with a knife to coaxial cable outer protective tape stripped 1.5cm, be careful not to cut the metal shielded wire, and then the core of the milky white transparent insulation layer stripped 0.6cm, so that the core exposed.

2. Connect the core wire

3. Assemble the BNC connector,impedence with 50Ω and 75Ω

Connect the core wire, the first shielded metal sleeve into the coaxial cable, and then the core pin from the BNC connector,impedence with 50Ω and 75Ω body tail hole into the front, the shield twisted into a hole from the side out:

4. welding

With the soldering iron core and shielded wire welding BNC head welding point, put on the soft lance material insulation sleeve and tail sets can be.


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