For hi-fi systems check your aerial isn’t broken or become loose. Each DAB multiplex is broadcast using a specific frequency and the transmitters used by that specific DAB multiplex all use the same frequency. This is known as a single frequency network (SFN). For example, the leads from your aerial wall plate to your television or leads to external speakers. Note when the nearby lamps switch on and off and compare it with when you experience the problem. Contact the Freeview Advice Line on 0808 100 0288, or for further details please see Freeview TV Changes. If you are using a satellite dish to receive your television, you will also need to check the LNB and cap for any signs of water damage. It rarely causes problems when listening to strong stations, but is a nuisance when signals are weaker. Further information can be found on our ways of tracing interference to radio reception help guide. For further information see our, Water can get into external cables and can cause reception problems. As trees sway in windy weather the screening effect varies, leading to fluctuations in the quality of reception. For more information see our interference caused by lighting. This is commonly caused by the FM signals being bounced off objects or hillsides and reaching your radio by different paths. This is often caused by Power Line Telecommunications (PLT) devices. Please see our help guide on a manual retune. It can normally be heard as you tune across the AM bands. This could be unwanted signals and result in picture loss on your own television and, maybe, those living nearby. If you are using a portable radio with a telescopic aerial make sure it is fully extended, you may also need to tilt or swivel the aerial to get the best reception. If you receive this additional signal it can potentially cause picture break up. For more information on finding and storing these services, see our, There is a possibility some LED Lights can cause interference to DAB and FM Radio Reception, particularly if LED lights are used to replace halogen lights, and retain the original transformer. As the aerial is directional, by simply turning the radio you will be able to get the best reception. Deleting all the presets and then re-scanning to select local ones may fix the problem. As a rule of thumb, hissing, distorted 'S' or 'Z' sounds, whistling and twittering are not interference but are caused by general reception problems. Street lamps can sometimes cause buzzing and crackling sounds on your FM radio. ; Page 2 2b. If all other stations on the same DAB multiplex are working ok and you have just lost one station, this is not due to interference. Check any appliance with an electric motor by moving your radio away from it to see whether the sound improves. Use the list of symptoms below as a guide to help you identify a possible interference source. An aerial contractor should be able to recommend the best one for your problem. This is impractical and would be very expensive. National commercial digital radio multiplex operator. For more information see our guide on tropospheric ducting. If the problem persists when you turn the heating system back on, the problem could be with the thermostat, which may need to be repaired or replaced. Check whether there are any known works or warnings that might be causing the problem. Very occasionally your reception can be affected by weather (high pressure) which can cause hissing or even loss of reception. For more information on finding and storing these services, see our Help guide on DAB secondary services. The DAB standard was initiated as a European research project in the 1980s. If your DAB digital radio has the digital tick mark, or you know it has an FM mode, you could use this for reception of Classic FM. This may be due to two reasons. The problem is that we've just bought my grandparents a DAB/FM radio for christmas. If you are using a portable radio, it may be necessary to move this to a different position in the room. However, if the original light used a transformer, rather than directly running off the mains, it is possible the transformer is causing the interference. It is important to check your own system to ensure your cables and connectors are in good condition. The best digital radios today offer top sound quality and slick interfaces – and at a reasonable price point too. Use our transmitter tool to check you are tuned to the best frequency for your area, as you can often pick up more than one signal. When the BBC has additional sports content, it can be found next to Radio 5 live on DAB radio. You need to have a suitable DAB aerial to receive DAB services. The problem could be due to a number of reasons, the station may have stopped broadcasting or have moved multiplexes rather than a radio fault. For more information on how weather can affect your Radio services, please see our guide. It is rare for a windfarm to cause interference to your reception. You can use our transmitter checker to see if you are in good radio coverage. For more information, please visit our page on how weather can affect your Television and Radio reception. The 5 Live Sports Extra schedule is available online, and Radio 4 LW on DAB, broadcasting Yesterday in Parliament, along with the Daily Service each day on their respective websites. Unlike the other services, all the predictions of DAB coverage are for indoor coverage. If you find water damage then it is likely that the cable will need replacing by a qualified aerial installer. The first is a fault with the local FM transmitter. 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