OK, from experience of my DVB-T receiver which is about 7 years old and slow anyway, when the signal is bad, the picture cuts out obviously, the audio breaks up badly. has kind of a squeak to it when it tries to come back through again, I imaging DAB (and similar systems across the world) are the same in terms of bad signal and audio though I don't have a receiver to try with
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Thanks Tinkerbell.
Allegedly away with the fairies for 6-7 years