The change from analogue to DTT in 2010, igniting a forty channel, called blackout. However, four years later, the black cast can stop being metaphorical to become a reality. The coexistence of 4G signals for mobile phones and television TDT, from January 1, 2015, may cause interference (affectations, in technical terminology), which would prevent some channels or directly properly, they would not let watch TV. Moreover, the use of 4G phones could cause interference on the TV.
The digital dividend represents the moving DTT channels to clear the space now occupied so it can be used by telecommunications companies. All indications are that the Cabinet could approve today the Royal Decree that regulates it. This change, by European mandate, will involve the coexistence of 4G emissions, in the 800 MHz-band with DTT. That is, antenna through which we watch TV capture both signals , which could cause interference.
“Today there is no problem because there is enough distance between the two you point. But since January, the security cordon disappears and both signals are next to each other in the spectrum and can be affectations. According installation of community housing and individual will have to take steps to avoid problems, ranging from the installation of filters to change teams “, explains José Manuel Muñiz spokesman Coordinator Telecommunications Federation ( Fecotel).
The antennas pick up all the UHF (470-862 MHz) band, so the band 790-862 MHz, where the 4G signal is located is included (technically called LTE signal). “The majority antenna park in Spain will need to install a filter that discriminates DTT 4G signal and so avoid affectations” note from Televes, a leading Spanish company that manufactures equipment for the reception and distribution the television signal. And it could be the case for a block of flats will all black , that no neighbor watch TV or see with interference or pixelated.
Televes knows of what he speaks. He won the contest in the UK to supply filters that mitigate potential interference. “Experiences in Europe indicate that a building that is less than 200 meters from a mobile transmission tower, if you do not have filters to discriminate the TV signal and 4G, can problems . Even with filters might have problems, but not proven. A more than 200 meters, should not happen anything, “added from the company.
But, of course, in the signal mobile, both smartphones as the tablets are also emitting signal. Whenever network usage is become affectations could cause issuers and on television. “These are transmitters and signal terminals can be cast in making the home and may cause interference” from Televes allowed. “It is very likely to occur interference. Which does not watch TV while using the 4G mobile or do not have access to internet while watching TV “, describes Muñiz.
That is, to avoid problems with the television signal, plus the corresponding reantenización-for changing channels-instead of going to be need to install a filter at the antenna is on the roof and, most likely, another inside the home , in making the antenna and the TV. “It would be appropriate that the installer or antenista could solve all the problems in one visit, not to create more costs to citizens,” say Fecotel. Although it is impossible to estimate a cost, it could become an amount exceeding € 1,000 per community. And it from the government anything is not subsidized. In the UK, for example, households received free filter. The filters for the antenna are larger than those used for the interior of the home cost.
The Ministry of Industry , which together with the sectors involved has two years of pruebas- stated in the action plan for the release of the digital dividend in the pilot test conducted in Zamora and Fuentesaúco the interference were found. It also says that the measure was to mitigate the installation of filters in the antenna, because “users-filters installed in the home between the TV and the antenna-making were inefficient to not eliminate saturation” reflects the document.
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