Analogue TV – Interference
Interference happens when a TV signal is distorted by other signals or objects before it reaches your TV aerial. It can be caused by electrical equipment, radio communications or the weather.
If you have a poor quality TV picture like one of the images below, please click on the relevant link for more information. Otherwise, see the main Picture and sound problems page.
Patterns, dots, flashes, loss of colour, buzzing, clicks: see Electrical interference
Wavy or herringbone pattern: see Radio interference
Smooth, evenly spaced horizontal bars - a 'Venetian blind' effect: see The effects of weather
Ofcom interference investigation service
If you cannot trace the source of interference, you may want to ask Ofcom to investigate. If the interference is caused by something outside your control, they will give advice and take action if possible. Note that they may charge a fee if they find it is something within your control. Ofcom is also responsible for licensing radio users and preventing illegal broadcasting.
© MMIX