When a Sky receiver / digibox / box is turned on the first time the first thing the box tries to do is, amongst other things, to download approximately 6 hours of EPG information from a specific default frequency (or Transponder) from the satellite. The Sky digibox must have this information to start to work and allow you to watch Sky TV..
Unfortunately, the default frequency (transponder) that the decoder is initially set to look for (11778) is one of the weaker signals in Spain and the Costa Blanca, especially during the afternoons, even on a 2.4m dish! So should you experience one of Spain's frequent power cuts during this period, your Sky digibox may be unable to find this frequency, fail to boot up, and display the on screen message "No Satellite Signal Being Received".
Therefore, to assist the digibox to receive the bare minimum information it requires boot up the default frequency must be changed to another frequency to enable the initial information download.
Best Default Trasnponder Frequency Settings for a Sky box in Valencia