A person who is not strong in physics or the business of electricians, in principle, it does not matter to know the features of a cable, it is better to entrust the choice to a professional. But this is if the matter is connected with electricity. You can choose a TV cable yourself.
The main thing is to understand that the cable from the TV to the antenna does not conduct current, therefore it can be replaced independently. But before starting work it is necessary to figure out how to choose the antenna wire correctly.
- 1 How does a television cable
2 How to choose
- 2.1 Video: TV cable selection
3 Antenna connection
- 3.1 Video: preparing the antenna wire for satellite TV
- 3.2 Video: Connecting the wire to the antenna
- 3.3 Video: how to compress and connect the TV cable
How does a television cable
In the store it is called "Coaxial". Inside him:
- central vein;
- outer conductor;
This type of electrical cable is always round and is used to transmit a signal. Due to its design, this type is used not only to connect a TV, but in communication systems, to connect home and military equipment.
In special stores, a good and suitable wire for TV has the marking:
In the last marking, the number 75 means the characteristic impedance in Ohms. The greater the resistance, the less noise, however, there is no point in choosing a wire more than 75, but you should not take less either.
The attenuation rate of the signal is the next important characteristic, which is measured in dB / 100m. Each TV channel broadcasts at its own frequency and the attenuation index is also its own. A good electrical cable should be low.
When choosing, you should pay attention to the following indicators:
- type of television system;
- lengths from antennas to the TV;
- places where the cable passes;
- the presence of corners and turns;
- wiring selection;
- number of televisions.
Now about everything in order.
Video: Coax for TV
How to choose
First of all, you need to immediately think about where the entire system will go. If the antenna is outside houses, and the wire will pass along the street, then it is necessary to choose one that is resistant to temperature and moisture. It depends on the density of the cable braid, its diameter, special impregnations and the carbon layer. The thicker it is, the thicker the vein (and the signal attenuation index depends on it) and the more resistant it is to climatic and mechanical damage. If the antenna is located on a window or balcony, then there is no need to take the largest one - a cable with an outer diameter of 6–7 mm is enough.
Wires for satellite and cable TV are different. That is, the device is completely identical - the core, the insulation, the outer conductor and the shell. Only here the satellite signal, along with the power supply of the convectors, passes through the core (most often copper), and the cable signal - along the surface of the conductor. Therefore, wires with a thin core (less than 1 mm in diameter) are not capable of transmitting a satellite signal without interference.
The antenna wire can be mounted near the power cable only if their external diameter is 6–10 mm and protection against interference is enhanced. You can bend thick electric cables at an angle of no more than 90 °.
You can summarize all of the above with one statement - the thicker the TV wire, the better.
Tight cable braid - an indicator of its durability. It should not be easy to "tear off", it can not be scratched, for example, with a fingernail. However, too rigid insulation will not give the opportunity to bend the antenna wire.
Today, foil or aluminum film is used as an external conductor. The absence of this usually indicates that the goods in front of you are not of the best quality.
A good antenna wire usually consists of a copper conductor. There is no evidence that this material is better suited than other alloys. But, if there is a choice, it is better to buy an antenna cable with a copper conductor.
The color of the shell, despite the opinion in narrow circles, does not indicate anything. The color of the wire can be any - one that you like. Special color manufacturers use to distinguish television from the power, if they are mounted nearby.
You can find out the "composition" of the electrical cable by asking the seller to make a cut, so it is better to avoid the packaged goods, even if everything is written on the packaging. A good option is a copper conductor with a cross section of 1 mm, dense insulation, a layer of foil and copper braid of tin and a dense shell.
The length of the cable is a strictly individual matter. Before buying, it is necessary to calculate not the minimum distance from the antenna to the TV, but to take into account all the indents on the bottom of the wall and turns. You also need to take the antenna cable "with a margin" in case you want to move the TV to another place in the future.
Accessories for cables are connectors, adapters and splitters. It is better to choose them in the same place where the wire is bought, so that the seller will help you select the parts that are suitable for the diameter. Also, for satellite cables, it is better to purchase corner adapters in order not to bend them.
Video: TV cable selection
To connect the cable to the antenna or TV you need to attach the plug.
For beginnings it is necessary to make a circular cut of the shell at a distance of one and a half centimeters from the edge. It is necessary to remove only the shell, without touching the hairs of the screen. Screen hairs and foil are folded back to release the inner insulation layer. It is necessary to bend down carefully so that nothing is torn and not torn out. The inner insulation layer is cut off and removed. The distance between the bare vein and the folded foil must be at least 2 mm.
Next, you need to screw the plug, turning it clockwise until it stops. The rest of the excess veins cut. In the same way, prepare the antenna wire from the other side. It is necessary to do this after it has been laid from the antenna to the TV in order to shorten it as needed.
The main thing is to choose a good wire that will meet all parameters.