No hay señal tdt
The transition process varies from country to country and in some countries it is being implemented in stages, as in the case of India and the United Kingdom, where regional sectors have different dates for implementation. In other countries it is being carried out at national level, as was the case in the Netherlands on December 11, 2006.
UHF (Ultra High Frequency) is a band of the electromagnetic spectrum that occupies the frequency range from 300 MHz to 3 GHz. Tropospheric space wave propagation occurs in this band, with a maximum additional attenuation of 1 dB if there is clearance of the first Fresnel zone.
One of the reasons for the choice to switch to digital television is the future availability of the bandwidth currently used for analog broadcasts. Consequently, many sectors are interested in acquiring part of the digital dividend, including mobile telecommunication operators, broadband access providers in rural areas, TV broadcasters, etc.
Despite the fact that we use it every day, the technology behind traditional TV broadcasts can be somewhat confusing, with many acronyms that are difficult to discern, such as DVB-T2. Today we will see what DVB-T2 is and what advantages it has over the previous version.
Before getting into the subject, we will clarify that DTT and DVB-T are closely related concepts. They are not exactly the same, but when talking about one it is inevitable to talk about the other. We will focus on DVB-T2, although we will also explain the elusive difference between DVB-T and DTT.
You probably already know that DTT stands for digital terrestrial television, while the meaning of DVB-T is not so popular: digital video broadcasting, or digital video broadcasting. DVB-T is just one of the different types of DVB that exist, namely the one in charge of terrestrial video broadcasting.
In any case, the concept of DTT2 refers to changing the DTT technology from the first DVB-T version to the second, DVB-T2. In short, technically DTT is not the same as DVB-T, since in the future a totally different system could be used to transmit television broadcasts, but for now both words are often used as synonyms.
The first thing is not to be alarmed. The breakdown does not have to be of the television, it does not even have to be in the building itself. It is possible that we do not need to call our technical service of confidence and we can solve it ourselves but, in which cases?
In case the problem is in the television receiver or in the DTT, whether or not under warranty, we must contact our trusted technical service to make a diagnosis and a budget, and thus know if it compensates us to repair or buy a new device.
If with another TV it still does not work, we will try in another outlet of the house, if it works in another outlet, what is wrong is the outlet where we have the TV, otherwise, the problem comes from further back, either from the downspout, the antenna or, in very isolated cases, from the repeater.
To find out if it is from the downspout, we will first ask the neighbors. We will start with the one below and continue with the ones above until we find one that does not have problems with the reception. When we call the technical service we will be able to indicate that we have delimited the failure between one and another floor and the failure will be solved in less time.
Mi televisor dice sin señal
Desde los inicios de las emisiones de televisión se han utilizado señales analógicas a través del aire, para la transmisión de los programas. Sin embargo, el aire no siempre es óptimo, ya que es fácil que surjan interferencias entre los repetidores cercanos. Además, si nos alejamos de un repetidor de televisión las señales, al llegarnos seriamente atenuadas, muestran una mala calidad de imagen, con efecto «nieve» o rayas molestas.
No sólo en regiones aisladas hay problemas de recepción, incluso en las grandes ciudades podemos tener dificultades si tenemos cerca edificios altos que nos afecten a la «visibilidad» de la señal. Esto puede producir efectos como el ghosting o tener canales que no vemos en baja calidad.
Todas las situaciones expuestas hacen que la señal que llega a nuestro televisor sea diferente a la que inicialmente emitió el centro emisor. Estos cambios de señal siempre tienen un efecto negativo en la calidad de imagen y sonido que finalmente recibimos.
La TDT (televisión digital terrestre) utiliza las emisiones digitales para la transmisión de los canales de televisión. La principal característica de este sistema es que proporciona más inmunidad a las interferencias, proporcionando una alta calidad de imagen y audio incluso en situaciones en las que las señales analógicas dieron un mal resultado.