[Sideband]

I have a digi box that creates interference on MW and can also (if I droop the TV aerial feeder cable over it) cause noise on the TV picture. The central heating timer also causes horrendous noise when it switches on. I fitted a filter in the mains feed to that and it has helped a lot. The Internet router causes pulsing noises which seem to spread across the entire MW band and probably into SW as well.

All these items are supposed to be 'approved'.....I seriously have my doubts!