The TV antenna is not working well. What to do if the antenna on your TV does not receive reception?

If the message “No signal” appears on your TV screen. The image is constantly interrupted. that's most likely the reason. insufficient signal from the antenna. Most common cause oddly enough, is bad contact. in the antenna plug. . Therefore, it is worth checking first. connecting the plug to the antenna cable. Sometimes even just moving the antenna cable is enough. and see how it is reflected in the image. But it is better, of course, to disassemble the plug and visually check how reliable the contacts inside it are. A. the central core does not short to the braid.

The second most popular reason for a low signal is failure antenna cable. Even a fairly new cable can. bad to miss television signal due to poor workmanship or kinks as a result of installation. And even good, well-laid cables over time can lose their ability to conduct a television signal well.

It is worth recalling that digital dvb t-2 broadcasts in Russia broadcast exclusively in the UHF range, that is, at fairly high frequencies. more high frequencies present. increased requirements for contacts. quality of cable and connections. Therefore, if your antenna begins to show certain channels poorly, then most likely you have problems with reception UHF range. means that it is unlikely to achieve sustainable reception digital TV channels until you resolve the issue with the right way UHF band with your terrestrial antenna.

All the problems described above can apply to both active and passive antennas. But there are a number of other problems that may arise when using active antennas. By the way, driving through any Russian populated area, you can meet terrestrial antennas, aimed at the most different sides Sveta. Therefore, it is a good idea to make sure that your antenna is facing in the right direction.

Problems with active antennas

An active antenna differs from a passive one in the presence of two additional elements. main element This is an amplifier that is located inside the antenna and, despite relative sealing, is often destroyed. exposure to an aggressive external environment. The main enemy. active antennas are lightning strikes and high humidity. The second important element of an active antenna is the power supply. Typically located next to the TV. and is powered from a 220 volt outlet. The power supply has an injector plug that plugs into antenna input TV. His task. transmit power for the antenna through the cable and at the same time do not pass voltage to the antenna input of the TV. Antenna amplifier and power injector - devices that have their own limited period services. therefore we recommend. due to the need to use active antennas. and if their use is justified, perform diagnostics of electronic elements.

The TV shows poorly from the antenna - there are two reasons. Device mismatch bad equipment. The latter concerns the antenna; television receivers cope with the tasks one way or another. However, the problem lies in the amplifier. It must at least be tuned to the desired frequency. Below we will consider typical situations and methods of solving using the simplest methods. The simple way is to buy a satellite dish and install it. Alternatively, stop watching TV, the Internet is much more fun!

Cable problems

It sounds funny, but the first thing you should do is check the cable. There are several requirements that must be observed:

• Firstly, characteristic impedance TV cable is 75 ohms. Deviations in magnitude provoke reflection of part of the power in the path, which will inevitably lead to losses. Coordination methods have been invented, using which it is possible to use a cable of a different impedance. Let's wait to fence the garden. Devices designed to operate television broadcasting, characteristic impedance 75 Ohm. We take into account the elementary truth when selecting a cable.

• The second tip concerns owners indoor antennas. Typical picture: a wave channel hanging, half wave vibrator with antennae, there is a coil of cable nearby. First of all, we look at whether the antenna is active or passive. Do you need to turn on the power? If it turns out to be passive, cut off the excess cable and decorate the pantry with a coil. The feeder segment introduces irreparable signal losses. In an antenna receiver, sensitivity strongly depends on the attenuation before the first amplification stage. In our case, it is located inside the TV; the cable to the socket introduces incredible losses. Another thing is the active antenna. The first amplifier stage is located here, the cable length becomes uncritical.
• If the passive antenna is on the roof, it’s a good idea to get hold of the cable characteristics using the Internet. It is logical to see whether the linear losses exceed 0.2 dB. The attenuation is determined by the length of the feeder, electrical characteristics products. Three meters of good cable introduce attenuation equal to one meter of cheap cable. It is recommended to install an amplification antenna and replace the cable. Fortunately, television is inexpensive. Forget the high cost of high-frequency WiFi!

Why do you need an active antenna?

They said that if the antenna is active, the cable length is acceptable, losses should not be considered a critical element. If a good wire cannot be obtained, the length cannot be reduced, the roof is far away, you have to buy active antenna. Please note: to install the equipment, you will need permission from the HOA, the owner of the house. Insanity is observed: they are harnessed to make up special plan placement of utilities, paying a fee to a specialized company, pay a professional technician performing the installation. It has to be done according to the rules.

An antenna amplifier will allow you to bypass the limitations imposed on quality and cable length. The power cord will often need to be pulled to the roof. The distance to the TV station is small, the point is simply blocked by houses - we recommend trying to catch the signal using the indoor variety. The TV will show without a common antenna. It is allowed to place the “Cheburashka”, decorating the balcony, even above the suspended ceiling. The path of passage of the reflected beam is mysterious. However, conditions change according to the weather, and reception will deteriorate (or improve). It is recommended to give preference to omnidirectional antennas, which have a lower directivity coefficient and are equipped with an additional external amplifier.

Detect antennas significant drawback, which has nothing to do with the quality of reception of an individual signal. The sources of the problems are attributed to the multipath effect. An omnidirectional antenna receives from all directions (azimuths). Several rays will hit, the image will begin to double. Over-amplification causes a similar effect. Remove power electric shock, look at the result. Reddish snow is removed in the same way. The reason is the same - over-amplification.

Advice! Adjust the equipment in an attempt to obtain required characteristics. Reduce gain. Buy a television attenuator. These will reduce the gain by twenty dB.

An undeniable disadvantage of omnidirectional antennas has been noted: interference sources will act from all directions, sharply reducing the signal-to-noise ratio. This is not critical for digital multiplexes; broadcasting contains error correction codes. Reception analogue television with an antenna with an amplifier is impossible if the noise intensifies above the level of the useful component.

Antenna selection and installation

The antenna itself may not match the received signal, or it may not be installed correctly. Many people know that it is useful to orient a device in space, but not everyone knows how to do it. Television in Russia on UHF is built on horizontal polarization, so misalignment of the half-wave vibrator or wave channel is guaranteed to lead to poor reception. At the same time, the frequency range also shifts, due to which the picture quality further decreases.

You will need to use a level to align the antenna at correct position. In addition, when receiving from distant TV towers, a simple rule applies. The higher the antenna is positioned, the greater the chances of catching the broadcast. This rule applies to UHF, which is why the MF and HF ranges still remain attractive. Waves at these frequencies bend around the surface of the earth, so you can catch them without even taking the antenna to the roof.

External barriers also contribute; if there is a forest around, the reception will be worse. Waves attenuate when passing through obstacles. In this case, it is recommended to purchase an antenna with an amplifier. The type also plays a role. Full-wave vibrators receive signals much better, but they are difficult to get in the store. Will help homemade antenna. Made from a copper or aluminum cable core and installed according to the rules, it will provide best reception than store-bought.

We have already told you more than once how to make a narrowband antenna that is tuned to the channel frequency. In this case, it is also possible to achieve excellent results in simple ways. Eventually, hobbyists are even constructing quarter-wave vibrators for digital receivers. It's just a short piece of wire with a quarter wavelength of shield stripped off at one end. For the first multiplex in Moscow, this is 13.5 cm. A connector is soldered to the other end, which is inserted into the receiver. The quarter-wave vibrator is located horizontally. If necessary, it can be bent at the base for convenient placement. Even such a simple and uncoordinated design produces results in television reception.

Wave channel antenna matching

Beginners are concerned about the question of how to properly match wave channel antennas. The designs are very simple and provide excellent gain. The design is ideal for the UHF, where they lie digital multiplexes. First, let's look at signal balancing. Operation will be required if the descent cable is longer than 10 meters. The device is a piece of wire parallel to the feeder, spaced 3–5 cm.

The method is suitable for a wave channel made according to standard rules. The screen of the reduction cable is simply placed on one side of the active vibrator, but on the other side the balancing section of the cable is attached. The length depends on the channel, for example, for the first Moscow multiplex it is 17.6 cm. At its full length, the piece is parallel to the descent cable. How to connect the device:

• The core of the balun is placed on one side of the active vibrator parallel to the core of the reduction cable. The braid of the segment is closed here.
• At a distance of the length of the balun from the active vibrator, the insulation of the reduction cable is stripped. The screens of the parallel wires are closed, and the second end of the segment core is connected here.

The situation is much more complicated with antennas whose characteristic impedance is below 75 Ohms. Then special matching devices are used. The active vibrator can be made T-shaped. Top part The loops are extended with additional wire in both directions. The total length is calculated by the formula:

L = (λ/2)*(1 – 0.225/ln(λ/2d)), where

λ – wavelength, m; d is the diameter of the wire, expressed in meters. The height of the loop is equal to one hundredth of λ or slightly less. The width of the loop is selected experimentally, trying to bring the wave impedance closer to 75 Ohms. The dependence graph is “humpbacked”. The maximum is observed at a loop width equal to λ/4.

By designing your own antenna, this method is suitable for the vast majority of radio amateurs and will allow you to produce a device that has the required impedance. Having a drawing in hand, duplicate the design a specified number of times. Be prepared to work hard if your TV shows poorly. Find out the broadcast frequency and make a special antenna.

Signal interference will be minimal in this case. Construction procedure wave channels described. Explore the portal! Let's gather our strength, consider the design of log-periodic antennas, I'm just curious how to do it. The peculiarity of the product is that it catches a wide range of broadcasts. Coverage log periodic antenna amazing.

You can do without some things, but their absence causes some discomfort. The case when the TV shows poorly is an excellent confirmation of this. Constant interference is very annoying, so I want to get rid of it as quickly as possible and get a clear, beautiful picture.

Antenna and cable problems

If the TV worked fine all the time, and then the picture deteriorated greatly, then a reasonable question arises: why did this happen? To answer it you need:

• check all connections;
• check the condition of the cable, it may be pinched or broken;
• make sure that the settings are not lost.

If the TV catches on the antenna, then you need to see if any trouble has happened to it. After strong wind, hail or snowfall, the antenna may change position, tilt, break, or a heavy object may fall on it. In the presence of individual antenna, it is necessary to check the reduction cable. It must be inspected visually and tested using an ohmmeter.

A satellite dish can also change its position under wind pressure, but it is very important for it to be oriented in a certain direction with great accuracy. When the position changes, the channels begin to show poorly or disappear altogether. To properly set up a satellite dish, one person must rotate it, and the other must monitor the signal level.

It happens that the reason for a poor TV display is a breakdown of the receiver or converter. Check to see if the device light is on and if an access card for a coded channel is inserted. If the devices are under warranty, then you need to send them in for repair or replacement.

If you share an antenna with your neighbors, your neighbors show it well, but yours shows it poorly, then first check the cable. From the cable wiring in the panel parallel to the home cable, we throw a piece of another cable and connect it to your TV, bypassing the apartment wiring. If the TV starts to show better, then the problem is in the wiring, otherwise look for the reason in the TV or in the interference created by household electrical appliances.

Problems with cable TV

When connecting to cable television, when the signal is distributed via cable, the reasons for poor display may include incorrect setting channels. You need to reconfigure or contact your provider. If the image is clear, but the sound is wheezing, then in the settings you need to set the sound standard to DK.

After you have verified that everything is fine with the setup and the service provider has confirmed good quality signal, you need to check the condition of the cable. Perhaps it is too old, frayed in some place and needs to be replaced with a modern type.

There are statistics on the reasons why cable television shows poorly, and which very well answers the question of why communication problems occur. Here's most of them.

• The TV plug is not fully inserted into the socket.
• The integrity of the cable is broken.
• Incorrect connection in wiring to TVs or apartments.
• Using low quality dividers.

According to the connection diagram, the difference cable TV from antenna is that with cable, one transmitting node is installed in a small area of ​​several houses. If for some reason the power supply to the node is interrupted, then all users who are connected to it will not receive a signal. In this case it is necessary to eliminate main problem, providing power to the node. Such issues are dealt with by utility services, and nothing depends on the users.

Contrary to the predictions of many experts, the Internet has not been able to supplant television. IN Lately Technologies have made significant strides forward, but it has still not been possible to completely get rid of image problems, and often viewers do not understand why the TV shows poorly.

The image can be affected by:

1. weather;
2. proximity of signal sources;
3. technical capabilities TV;
4. features of device settings.

The article discusses the main causes of malfunctions.

Preventative work

Sometimes a channel stops broadcasting for a while (usually several hours) to conduct Maintenance. If the other channels are working normally, then most likely you should wait a little, and the broadcast will be restored automatically. During maintenance, a special screensaver may be displayed on the screen.

Also, the absence of an image may indicate a problem with the operator that provides television broadcasting services. It is worth asking about the image quality from your neighbors who receive a signal from the same network as you. However, if the problem does not disappear, then you should call the operator’s office and clarify the details, but do not forget to check the condition personal account, because the service could be disconnected for non-payment.

Antenna problems

Most televisions use radio receivers. Most often, the TV does not show well from the antenna due to the presence of unfavorable weather conditions, for example, high clouds and precipitation significantly scatter the signal. In this case, the problem can only be solved by installing a better antenna.

A bad image may also be caused by damage to the antenna. This happens due to strong winds, which can bend the receiver, or hail. It may also pose a danger a large number of snow, antennas with large area surfaces may not withstand the weight of precipitation and become deformed, this is one of the main reasons why the TV does not receive the signal well.

Even mechanical damage are missing, under the influence of air currents the antenna could change its location and turn in the other direction. This happens due to poor quality installation, but this option should not be ruled out. Sometimes it is necessary to make adjustments to the parameters satellite dish, this is due to the fact that the flight path of the transmitter may change slightly.

Signal interference

This is more relevant for residents of country houses than city apartments. Many people are faced with the fact that The TV at the dacha is bad. This happens due to the fact that the radio signal tends to dissipate in the atmosphere, and its source can be located at a considerable distance; transmitters are usually located in large cities. It is necessary to replace the signal receiver with a more sensitive one or place it as high as possible. Of course, you should not use an antenna model that is mounted on the TV body; it cannot provide a high-quality signal.

Residents of an apartment building may experience difficulties watching TV due to unauthorized changes in communications. Installing new devices often results in poor TV viewing from the antenna. Installation of equipment should be carried out only after permission from the supervisory authorities; if this has not been done, then it can be dismantled in court. One of the interference situations and how to eliminate it are shown in the news story:

Loose fastenings or faulty wires

Often the reason why the TV shows poorly is the lack of tight contact of the conductors with the input of the device. The connection may drop out from time to time, causing the image to disappear completely or wide black or gray stripes to appear on the screen. It is necessary to remove and reinsert the contact part of the wire into the connector, making sure that it is securely fastened there. It is necessary to inspect the connection points and adapters if several devices operate from a common antenna.

Next, you should pay attention to the cable; it should not have any damage; in particular, pets can damage it. It is not recommended to place heavy objects on the conductor or install it at a large bending angle, as this may lead to rupture. Communications are not always located in the entrance; for wires that are partially located on the street, there is a significant risk of damage, especially if they are long. It is necessary to ensure reliable fastening, otherwise the influence of wind will lead to significant vibration of the cable, which can break after some time.

To watch a channel, the TV is tuned to a specific signal reception frequency. Anyone who is trying to find the reason why the TV does not show analog channels well should pay attention to this. More than half of the frequency range is free, so if the channel information is incorrect, the TV cannot detect the required signal. Resetting the settings may occur by various reasons: from an independent attempt to change them, to a malfunction of the equipment, as a result of which it emergency returns to the factory parameters.

Symptoms of this problem are the non-working state of most TV programs, as well as spontaneous changes in the number of some channels. Re-adjustment should only be carried out by a specialist, as the process is too complex for regular user. If TV broadcasting services are provided by an operator, you should contact support.

Also, sometimes excessive signal amplification can cause interference. This function should only be used if there are problems with reception; in other cases, it can only do harm.

It is worth paying attention to this point if the TV suddenly becomes poorly displayed, and when changing the channel no improvement occurs. This is especially common on older models of home appliances, but new devices may also begin to work incorrectly after some time. The reason for this may be a breakdown of the converter, which converts the signal to low-frequency, or the receiver, which is responsible for reception. It is unlikely that they will be repaired, so the best option parts will be replaced with new ones, if the device is under warranty, then this can be done free of charge.

There may also be problems with the kinescope, in which case the colors may be significantly distorted, for example, green or red tones may predominate. When plasma TV Some pixels may fail, which leads to the appearance of dark spots on the screen; this may also be indicated by unusual sounds when the device is operating.

Other reasons may be due to incorrect selection of parameters or erroneous connection, but this is only relevant when installing a new TV. If the device functioned normally, then it is worth remembering who used it in last time, perhaps he noticed something unusual.

In contact with

Digital television is modern alternative standard TV. With this technology, image quality becomes significantly better at the same cost. The essence of this technology is that the signals are a sequence digital combinations electrical impulses. Digital technologies provide new opportunities for transmitting and receiving data.

It has its advantages. For example, mobility. There is no need to stretch wires and cables anymore, all you need is a TV, an antenna, digital receiver and a socket. This autonomous system, which you can take with you, for example, to the dacha and watch TV programs with the same high-quality signal, just like in the city. In addition, digital TV has a large number of broadcasts, and you can also access the Internet, TV guide, etc.

Possible causes of interference

A digital signal is generally reliable and much better than an analog signal, but even it is not immune to various types of interference. In any case, if the quality of the broadcast deteriorates, you will have to find out the reason why this happened. For example, if the TV does not show well and they are on, you need to check the antenna. Maybe it was installed poorly or just went wrong. The antenna can also break due to a large snowball or piece of ice. In addition, the TV may not show well due to a broken or faulty receiver, etc.

If, when connecting digital TV, the technicians fed the cable into the apartment, and further wiring was done independently (especially if there is more than one TV), then perhaps there is a bad tee. Interference may also occur if there is also a computer nearby and they are connected via HDMI cable. As a rule, interference on TV begins when the computer is turned on, and as soon as the computer is turned off, the image becomes high-quality again. In this case, interference may occur due to the computer (or rather, a video card with an HDMI port).

If you live on the top floor and the signal is weak, the nuts on the dividers may have oxidized or burned, the equipment has not been configured or has broken down optical receiver. There can be many reasons for the appearance of interference, and the easiest way would be to call a specialist so that he can find the true cause and eliminate it.

Availability at your home digital television makes it possible to view a range of different digital television programs. Delivery of digital TV to the consumer is carried out by connecting to the appropriate cable television. In this case, you can continue watching the same way analog channels in full.

Instructions

You should know that to take digital signal you need to install equipment that has the function of receiving and playing on the TV screen the standards of the transmitted signal.

It can be following devices.
Cable receiver, free-standing, DVB-C standard(when using cable networks) or DVB-T (for regular broadcasting), which has a separate control panel. The receiver should connect to the audio-video inputs of almost any TV, both analog and digital;
Modern TV, which has a built-in DVB-C and/or DVB-T tuner. IN in this case just a cable through which you receive the network signal to the antenna socket, and you can receive the signal after setting up the TV.
A computer, however, is required to view this additional availability PC card or external tuner connected via USB port.