The spectrum used by the DTT in Spain is very limited, and with the DVB-T standard not much more can be done to improve quality without switching to new codecs and coding systems. However, now some DTT channels are going to improve your image quality, although some citizens are going to have to retune their antennas.
It will be next November 3 when some of the broadcast parameters of TV3 channels. The objective of these changes will be to improve the quality of the signal, its coverage, and accessibility services.
TV3 signal quality improvements
For these improvements, they will use the satellite to transmit the signal, and will allow to expand the coverage of the channels in Catalonia and the reception of TV3 HD, 3/24, Super 3/33 and Esport3. The services of subtitling, audio description and all associated services of the Red button. In addition to television networks, accessibility improvements will also reach Catalunya Radio through DTT and the broadcasts of IB3.
These changes may force some receivers to retune. Therefore, if from November 3 you have problems, resort to the retune can solve them for you. The affected areas will be Gerona, Tarragona and Lleida. In Barcelona and in the Arán Valley it will not be necessary to retune, since the signal improvements do not imply a change in the emission parameters in those areas.
TV3 has not specified what changes it is going to make in the broadcast parameters, so we do not know if they affect elements such as modulation, the guard interval used to avoid interference with other nearby signals, or if they will slightly modify the frequencies in which channels are broadcast.
You may have to retune on November 3
Depending on the TV model we have, retuning the channels can be more or less easy. The most comfortable is retune frequency concrete where the channels are, although we can also give Automatic tuning to add all the new channels that are detected. This is the most comfortable option, since the new channels will be added at the end without messing up the old ones.
However, if we retune all the channels from scratch, they will become out of order. To order them comfortably, we can export the list of channels to a file and edit them on the computer with programs to order channels like ChanSort. In the case of having doubts or problems when re-tuning, from TV3 they recommend going to CCMA Hearing Service on tv3.cat/atencio.