How to connect coaxial cables better, and what is the role of coaxial cables?

Are the coaxial cables you talking about a closed route for us to watch TV? In many cases, you can connect the core in the middle (preferably soldered with tin), wrap the insulating material, crimp the shield tightly together (connect as many as possible), and finally wrap it tightly with insulating tape. Note that the core and shield cannot be short-circuited.

The connection effect mentioned above is not very good, the formal connection method is to have a coaxial cable connector, the two heads are connected to the connector, and then the connector is screwed together, so that the connection effect is the best, and the loss of the signal is minimal. Of course, there are other different connectors.

One end of the coaxial cable is connected to the digital coaxial audio output interface of the decoder (or **** machine), and the other end is connected to the digital coaxial audio input interface of the power amplifier. Then select the signal input of the amplifier as "digital coaxial", and you're good to go.

It is best to twist and pair first, and then hang tin soldering and wrap insulating tape;

At the same time, the shielded wire must also be welded and connected, and the shielding layer should be wrapped after the connection, and the shielding wire should be tightly connected, and finally wrapped with insulating tape, and try to prevent the direct force of the junction part when fixing;

Nonsense! How can a coaxial cable be twisted?!

Coaxial cable role:

Coaxial cable (coaxial) is a composite composed of two conductors, the center wire of the coaxial cable is used to transmit signals, and the metal shielding mesh plays two roles: one is the common ground wire of the signal to provide a current loop for the signal, and the other is as a shielding net for the signal to suppress the interference of electromagnetic noise to the signal. The center conductor and the shield mesh are located between the semi-foamed polypropylene insulation, which determines the transmission characteristics of the cable and effectively protects the conductors in between.

Coaxial cable uses:

Coaxial cable is widely used in the transmission of audio or radio frequency, and the transmission impedance is generally 75, which has become the standard impedance (in the early days, it will also use the 50 impedance characteristic for transmission). High-quality standard coaxial cables are generally more expensive than twisted pair cables, because of the reliable physical characteristics of coaxial cables, which can provide excellent sound performance. The frequency and resolution of the signal and the effective transmission distance of the cable play a decisive role in the audio system.

This is the end of the introduction of the type, function and use of the coaxial cable, and it should be noted that in order to maintain the correct electrical characteristics of the coaxial cable, the cable shield must be grounded. At the same time, there should be terminators at both ends to weaken the signal reflection effect.

Installation method: Coaxial cables are generally installed between devices. Each user position is equipped with a connector to provide an interface for the user. The interface is installed as follows:

1) Cut off the thin cable, install the BNC head at both ends, and then connect it to both ends of the T-type connector.

2) Thick cable Thick cable is generally installed with a tap-like device similar to a splint, which uses the guide pin on the tap to penetrate the insulation layer of the cable and connect directly with the conductor. Terminators are provided at both ends of the cable to weaken the reflection of the signal.

Need to be prepared to come with scissors or a knife.

or professional point source wire strippers, electrical baigong glue, the specific methods are as follows:

1. Strip the outer skin of the cable

Expose the inside. DAO's shielding copper wire. Generally peel off 5 cm.

2. Use a knife to peel off the inner layer of glue to reveal a centimeter-long copper core.

3. Screw the two cores together. Do not screw the thread in.

4. Wrap it with electrical glue. At this time, the silk wire should not be wrapped into the copper wire.

5. It is best to connect the silk thread and wrap it with electrical glue. And that's it.

Figure 1 and Figure 2.

Many people think that the coaxial cable is a wire, but in fact it is not, there are two wires in him, and some people always connect the coaxial cable to the open circuit, today the master teaches you how to connect?

Weld a BNC adapter (Q9 head) at the broken place, one male and one female, and then connect it.

Summary: What is a coaxial cable? Coaxial cable is a type of wire and signal transmission line, which can be used for the transmission of analog and digital signals, suitable for a wide variety of applications, the most important of which are television transmission, long-distance transmission, short-distance connections between computer systems, and local area networks.

So, what is the difference between coaxial and non-coaxial cables? Let's take a look. 1. What is coaxial cable?

What does coaxial cable mean.

Coaxial cable is a kind of wire and signal transmission line, which is generally caused by four layers of materials: the innermost is a conductive copper wire, the outside of the line is surrounded by a layer of plastic (for insulator and dielectric), and there is a thin layer of mesh conductive material (generally copper or alloy) outside the insulator, and then the outer layer of the conductive material is the outermost layer of insulating material as the outer skin.

What signals are transmitted by coaxial cables.

Coaxial chain cable can transmit digital signals, can also transmit analog signals, the specific signal depends on the way used by the cable station to transmit, the impedance is generally 75 ohms. For example, the traditional CCTV coaxial cable transmits radio frequency signals, as well as our common audio and ** cables also belong to the category of coaxial cables.

Coaxial cable transmission distance.

Coaxial cable is only suitable for short-distance transmission of image signals, when the transmission distance reaches about 200 meters, the image quality will be significantly reduced, especially the color.

Classification of coaxial cables.

1. According to the use.

Baseband coaxial cable: The shielded wire of the commonly used baseband cable is made of copper and has a characteristic impedance of 50 (such as RG-8, RG-58, etc.).

Broadband coaxial cable: The shielding layer of the cable commonly used in broadband coaxial cable is usually stamped with aluminum, and the characteristic impedance is 75 (such as RG-59, etc.).

2. According to the size of the diameter.

Thick coaxial cable: suitable for relatively large local networks, it has long standard distance and high reliability. Since there is no need to cut the cable during installation, the location of the computer can be flexibly adjusted according to your needs.

However, the thick cable network must be installed with transceiver and transceiver cables, which is difficult to install, so the overall cost is high.

Fine coaxial cable: the installation is relatively simple, the cost is low, but because the installation process to cut off the cable, the two ends must be installed with the basic network connector (BNC), and then connected to both ends of the T-type connector, so when there are many joints, it is easy to produce the hidden danger of poor contact, which is one of the most common faults in the current operation of Ethernet.

Second, the difference between coaxial cable and non-coaxial cable.

1. The constituent materials are different.

Coaxial cable: The constituent material is a copper wire conductor isolated by an insulating material.

Non-coaxial cable: The constituent material is several wires or sets of wires.

2. Different classifications.

Coaxial cable: It is divided into baseband coaxial cable and broadband coaxial cable.

Non-coaxial cable: divided into DC cable and AC cable.

3. Different types.

Coaxial cable: It is divided into thin cable RG-58 and thick cable RG-11.

Non-coaxial cable: It is divided into flame-retardant rubber cable, nuclear-grade cable, bare wire and bare conductor products, power cable, communication cable and optical fiber, magnet wire (winding wire), and flexible fireproof cable.

A coaxial cable is a cable that has two concentric conductors, and the conductor and shield share the same axis. The most common coaxial cable consists of a copper wire conductor isolated by an insulating material, another ring conductor and its insulator on the outside of the inner insulation, and then the entire cable is encased by a sheath of PVC or Teflon material.

According to its diameter, coaxial cable can be divided into: thick coaxial cable and thin coaxial cable. Thick cables are suitable for relatively large local networks, with long standard distances and high reliability, because there is no need to cut the cable during installation.

Therefore, the network access position of the computer can be flexibly adjusted according to the need, but the transceiver cable must be installed in the thick cable network, which is difficult to install, so the overall cost is high.

On the contrary, the installation of thin cables is relatively simple and low-cost, but because the installation process needs to cut off the cable, the basic network connector (BNC) must be installed at both ends, and then connected to both ends of the T-type connector, so when there are many connectors, it is easy to produce bad hidden dangers, which is one of the most common faults in the operation of Ethernet.