Firstly, you may have a poor aerial system, so we recommend you checking over your installation by reading our Good installation help guide. The effect can last from a few hours to a few days and can cause intermittent effects on the service during that time. The big wigs are working on it.” Its technical name is multipath distortion. Instead, they assume that something is wrong with the device itself. This has the potential to cause electrical interference. It is worth first checking to see whether the problem is with your own equipment, or the local transmitter. Water can get into external cables and can cause reception problems. Portable radios should be tuned in a location in your home where the best possible signal is received. If not, then check the radio and the aerial to confirm they are working correctly. Find out more about DAB digital radio and check if you can receive the national commercial stations. When the problem occurs check channels from all multiplexes. These are not recommended unless absolutely required as they can introduce unexpected reception problems. The CAI (Confederation of Aerial Industries) is a recognised trade body which will be able to put you in touch with one of their members in your area. If it is potentially interference, your landlord or management committee can contact the regulator, Ofcom, for help with solving the problem, using their contact web form. The aerial and cables need to be well maintained and you will need a radio that has an option to connect an external aerial. Keeping a note of when each lamp comes on and goes off will help to identify whether this is the cause of your interference. See our guide on Buzzing and Clicking. I've just been searching the forums for information on DAB radio in Crawley. This often sounds like birds tweeting and happens if there is another frequency being transmitted near the one you are listening to. The first thing to do is to swap any interconnecting leads. Switch lights on and off one at a time, Passing traffic - A distinct buzzing 'whine' which varies with engine speed. If your radio displays signal strength, use this as a guide to ensure the best position. There are a number of things you can do to check for interference: The most common source of interference to DAB is from LED lights. If it is from a wall socket check both the connector on the cable and on the wall socket for any signs of water or green build-up. urbling noises and breakup on DAB are normally reception problems due to a weak signal, but they could also be linked to some sort of interference. Make sure any cables between your radio equipment and aerial are connected securely. However the CAI (Confederation of Aerial Industries) is a recognised trade body which will be able to put you in touch with one of their members in your area. Check whether there are any known works or warnings that may be causing the problem. Firstly, you may have a poor aerial system, so we recommend you checking over your installation by reading our, To turn AD on or off, press AD on your remote. The telescopic aerial fitted to stereo portables is a compromise and the radio will often only give really good results if connected to an external aerial. See how weather can affect Freeview reception. This can commonly be caused by high pressure when, during fine weather, radio signals can travel much further than normal. To rule this out see our, Radio reception can drop out when on the move due to changes in topography. The first step in troubleshooting your problem is to rule out common problems and determine whether it's a reception or interference problem. You may need to check that all parts of your receiving system are fully earthed. A faulty or uncompressed engine can cause a distinct buzzing 'whine' which varies with engine speed. If you have a lot of appliances with electric motors you may need to turn them all off and try the above one at a time. As a rule of thumb, hissing, distorted 'S' or 'Z' sounds, whistling and twittering are not interference but are caused by general reception problems. Depending on the device that is at fault, it may be a process of elimination to find the source. The signal should return once you move away from these features. To find out if a particular switch is causing the problem, try turning the lights off one at a time. It is a process of elimination so it is important that you switch off everything in your home first to see whether the problem goes away. See our car radio guide for more information. You may get good, clear reception during the day, but after sunset the signal may fade or become distorted. During wet weather, when covered in moisture, all trees can have an appreciable effect on signals. 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