There can be as many objective reasons for lengthening or increasing the already laid television cable, stretched into a room. Most often, the need for this arises when moving a household television receiver from place to place (or moving it from one living space to another). One of the ways in which such an extension is carried out involves the presence of a set of two connecting elements, shown below.
Note! This extension is also beneficial because the use of a new integral piece of cable of a greater length is not entirely justified from an economic point of view.
Moreover, in the case of building it, in which the connection of the television cable (or rather its individual fragments) is organized, the additional costs of special adapters can be minimized.
TV cable device
Before you connect the television cable at the location of the proposed insertion of the extended section, you need to familiarize yourself with the structure of the wire used to transmit the television signal.
Additional Information. The name of the coaxial cable is chosen so because a special structure (coaxial) is used to transmit the wave signal, the nature of which is clearly distinguishable in the figure below.
Typical antenna-type television cables include the following required elements:
- Central core placed in durable polypropylene insulation,
- Aluminum foil shield protecting the center wire from electromagnetic interference,
- An outer braid intended for additional protection against external fields and forming the outer part of the coaxial structure,
- Insulation made of polyethylene, protecting the cable from mechanical stress and unforeseen damage.
Given this composition, before lengthening the television cable, it is necessary to carefully prepare each of the connected parts. Specialists call this operation the “cutting” of the wire, during which its individual sections at the joints are cleared of insulation and molded to fit the future joint.
Types of docking connections
High-quality connection of the antenna cable (as well as its individual parts), carried out with the aim of lengthening, is possible by the following known methods:
- Use a proprietary extension cord that goes on sale in the form of a piece of coaxial cable from 2.5 to fifteen meters long,
- Purchase special F sockets in the radio goods store and use them to create a classic detachable connection,
- Use for this purpose an adapter-connector of the “splitter” type,
- Make the elongation a separate piece of wire connected to the main line by means of ordinary twisting, and use the soldering method to increase its reliability.
The first of these options relates to the most reliable and repeatedly tested methods of lengthening the antenna wire, however, at the same time, it is also the most expensive. The second and third approaches to the problem of building up the cable at a cost are preferable to the first, but in this case too, a trip to the store for additional spare parts will be required.
The simplest way of joining pre-prepared (stripped) cable segments is considered to be the method of twisting at the connection points and their subsequent soldering. However, in this case, the reliability of the resulting connection leaves much to be desired, since the central wire at the twisting points can easily break off.
Important! Regardless of the method chosen, to obtain a reliable joint, products of the same make and thickness as the extendable TV cable should be used.
It should also be remembered that, in accordance with the standards in force in Russia and GOST “Cables. Television ”, the laying of communications is carried out by a typical wire of the RK 75 brand with a wave impedance of 75 Ohms (figure below).
Among foreign samples of the same products, such well-known cords as RG6 and RG59 are most common.
Adapting with adapters
Consider the intricacies of building wires when an extension adapter is used for these purposes (ready-made or made on the basis of special connectors). A ready-to-use extension cable for a television cable, despite its relative high cost, seems to be the most convenient from the point of view of labor costs.
In order to independently make such an articulation, the user should make a contact connector on the extendable end of the wire already laid in the apartment, suitable for the mating part on the purchased product. It is based on the assumption that the adapter purchased at the store from both ends has connectors made in the form of a conventional antenna plug.
Another method that allows you to connect the antenna for the TV through an extension of the cable, involves the use of special F-type sockets for these purposes.
Additional Information. To obtain an extension, two sets of such connectors are required.
Before extending the television cable by the insert method, all connected parts should be prepared for the upcoming operation. To do this, you need:
- Remove the protective insulation at each of the 4 joined ends in a small area (about 2-3 cm),
- Bend the protective braid together with the screen foil to the side of insulation (see photo),
- Next, the central core should be shortened so that no more than 5 millimeters protrude from the straight part of the connector screwed onto it (for this, you first need to try on it at the installation location),
- Upon completion of all preparatory operations, at one end of the insert by screwing in, a plug is arranged, and at the other - nestingly,
- The ends of the F-connector are formed in the same way at the ends of the stacked (old) wire.
Another well-known option for extending the cable is the use of tees of the “splitter” type, which are built into a broken circuit and allow you to create an extension bend. The order of formation of this compound is practically no different from the previously considered method, involving the use of a type F connector.
A feature of such a connection is the ability to get an adapter for an internal household network, which allows you to organize the wiring of a television signal throughout the apartment. Moreover, the latter will be transmitted to all television receivers with virtually no loss of quality.
The simplest, but not very reliable way, using which you can equip the extension fragment of the antenna cable, is to connect the elements by twisting. The disadvantage of this approach is the high probability of a break in the central core even with slight deformation or bending of the joint section.
In addition, during this operation, it is impossible to do without a soldering iron, through which the twisted contacts are first thoroughly tinned and then soldered.
Note! Before connecting antenna cables to each other in this way, it is necessary to choose products in soft insulation.
Before connecting a new cable section, for example, it is also advisable to ensure that the protective sheath is not only strong and flexible, but also can withstand multiple bends. In addition, it is important to prepare twisted parts in advance, which will be much easier to solder if you first clean them of varnish insulation and then carefully tin.
The formation of the conclusions in this case is somewhat different from their preparation for the previously considered detachable connection (adapter). To do this, you must:
- Remove insulation at a distance of about 3-4 centimeters from the extension end of the cable product (see figure below),
- The same will need to be done with the second cable blank used as an extension cord,
- Then, it is necessary to uncover the copper braid of each of the exposed parts, after which it will be possible to gain access to the polypropylene insulation of the central core,
- Following this, it is necessary to carefully cut the protective sheath of polypropylene, being careful not to touch the tip of the knife located underneath the wire,
Important! In case of non-compliance with this requirement, the probability of breaking the central core in this place during operation of the connected cable is significantly increased.
- Upon completion of the preparatory operations, it is necessary to strip the bare copper wires with a fine skin, and then tin them using rosin and solder,
- After the formation of a twist, consisting of two central cores, in order to reduce energy loss at the junction, it is carefully soldered with a soldering iron,
- Then, the resulting twist is isolated with a non-conductive material (ordinary insulating tape, for example), and a twist is formed on top of it from the ends of adjacent braids,
- At the final stage of work, the resulting connection is closed with an insulating tape, which protects the junction from damage and deformation.
The same must be done when it is the turn to connect the second end of the cable insert.
Cable Extension Examples
Possession of the basic methods of cable extension allows you to successfully cope with many problems, including solving the issue of how to fix the antenna, for example, or to extend the cord extending from it (photo below).
If, after disassembling the home antenna, it is found that a piece of the cable at the point of connection to the internal circuit is damaged, it must first be cut off and slightly shortened.
Additional Information. After such a shortening, the length of which should not exceed one centimeter, the docking zone must be prepared for subsequent soldering (as described above).
Before you repair any television set that has a cable connection, you should also have an idea of how to properly build up a damaged wire.
In the final part of the review, we note that the experts invited by the user will repair the failed cable line faster and better. But in this situation, one should proceed from considerations of economy and the ability to independently master the not-so-difficult technique of repairing a damaged cable wire or lengthening it.
Sometimes you have to make adjustments to the already laid home TV network. This happens when moving furniture, or if you have an additional television set “wound up” at home, or if the section of the coaxial cord is damaged in an elementary way and an insert is required. Then the task arises before you: how to extend the television cable or how to increase the damaged area to the desired length? Before you take a close look at the solution, learn how to properly connect the antenna cable, because any inaccurate connection of the TV cable is fraught with loss of reception quality. It would be nice to recall the cable device.
Coaxial cable is a telecommunication wire for transmitting low-power signals, consisting of two conductors that are separated from each other by dielectric material. The conductor in the center and the outer metal layer form concentric cylinders with a common axis. The conductive core in the center of the coaxial is a solid or seven-core wire. Usually it is made of copper, silver or aluminum with copper plating, copper-plated steel, etc. A woven metal web acts as an external conductor - a shielding braid. Most often it is a copper braid, aluminum braid. Many products use an additional shell made of an insulating film-foil, which precedes the wicker layer - an aluminum screen.
Now you understand that connecting two pieces of such a cable is not at all as easy as tying shoelaces in boots? Fortunately, more than one way has been invented for a long time to do this reliably and quickly.
How to connect a television cable
Before attempting to connect the television cable, make sure that both of its lengths are disconnected from any devices to which it was connected. Docking the cable when it is connected can present a number of safety hazards, the main among them being electric shock. When working with cables, safety always remains a top priority, therefore, proceed to the next step after taking the necessary safety measures.
Now you need to prepare the junction (the ends of the coaxial). On how carefully you do this, it will largely depend on whether the signal loss will exceed the allowable values that are accepted for the cable cable splices.
- make an incision in the outer sheath of the television wire at a distance of about 1 cm from the end, rotating it with your free hand,
- remove the cut off part of the insulation,
- lay the braid along the wire like a lapel of a sleeve,
- Cut a dielectric layer 2–3 mm closer to the end of the cable to remove this protective layer from the center pin.
This process should be repeated for the second end of the cable.
Connection via adapter
Using a TV cable connector, you can either build up a television cable or dock damaged parts of it on your home television network, whether it is an antenna installation of satellite or terrestrial TV. This is a small metal part, the task of which is to connect the signal transmission between two sections of the antenna cord. The design of the connector is based on the method of docking via F-connectors for a television cable.
The use of an F-terminal connector provides good signal quality in the cable. It accurately connects selected wires without undesirable gaps. Its installation does not cause problems even for an amateur.
You need to put a type F plug on each end of the wire and screw it tightly. Now it’s the turn of the “keg,” as the connector is sometimes called. There is a thread on both sides, and in the center there is a receiving hole for the central conductor. Place the ends of the coaxials in the adapter and lock by tightening the thread.
Devices of this type are completely corrosion-resistant, they are highly resistant to mechanical damage, so they can be used for installation both inside and outside buildings. The absence of corrosion significantly extends the life of the joint without the need for cleaning and maintenance.
Plug to socket connection
This method is suitable for you if you already have an “addressee” to which you need to send, with subsequent connection, an antenna cord. It can be an F-type receiving socket of a TV or set-top box, you can also connect a coaxial with a plug to the nearest antenna outlet, and connect it to the F-socket of an extension cable. For such connections, it is convenient to use corner terminators.
The simplicity of this, obsolete today, method of connecting the ends of the cable does not compensate for the signal loss that will inevitably occur during any joint deformation. Moreover, twisting alone will not be enough. If you have already decided on this type of coaxial fusion, then stock up at least with a soldering iron and electrical tape. Solder the connection of the central cores to each other and, separately, solder the braids. Then carefully insulate everything.
Although this applies to the general rules for handling cables, for joints made by twisting and soldering, it is especially important:
- do not drop objects on the television wire and protect it from shock,
- do not bend the joint - it is fragile,
- do not allow the spliced wire to dangle in the wind.
Common connection errors
The most common oversight when stripping and connecting a coaxial cord is that the aluminum braid can be wrapped in a foil layer. As a result, the inner side of the foil, while not being conductive, is on top. And in such circumstances, you should not rely on contact between the screen and the connectors.
Incorrect selection of the plug for the cable diameter is also often found. In the worst case, you will not be able to put on such a terminal or to plug a plug and a connector that are not suitable in diameter, at best - the resulting "looseness" will play a bad joke on the quality of the picture on the TV screen.
Rigid bends of the cable at the joints, as well as inaccurately cut insulation from the central core, also do not contribute to quality adhesion. Too sharp movements when cleaning the core can lead to notches on it, which later will provoke its breakage and loss of contact.