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Technical Index Aerial+LNB 1 Cable Aerial amplifier Aerial Filters Aerial Groups Aerial Points Aerial - Which? Amp Adder Analogue Switch-Off A18QR aerial Arcon Dish Atticbox Audio Adapter USB AV equipment BBC/ITV outside UK Bedroom sound Best aerial Cable Kinked Cable specs Cable-Thin Coax Cable - Which? CAMs etc. Capacitor Kits Channels Chimney Brackets Coaxial Cable Cooling fan Compass use Cupboard Control DAT45 aerial DC inserter Decouple cable Denso Tape Digibox in loft Digisender Digital Ariel Diplexers DirecTV Disconnect safely Disguise a dish Dish indoors Dish Painting Dish Sharing Dish Size E-books Electric shocks Electronic Kits Electronic Parts Epoxy resin glue Extend cable Extender Plate F1 for Free Filter-notch Fire Hazard Fit F Connectors Fit TV plugs Foxsat HDR Free channels Freeview/Freesat Freeview Problem Freesat Install DIY French sat TV German sat TV Greek sat TV Heatshrink Sleeving Hole Cover Humax PSU Inside Sky Digibox Instructions Interference Invacom LNB Italian sat TV IR sensor-locate Large Dishes Lightning Protect Liquid Spilt LNBs - about LNBs - add more LNB amplifier LNB Boots LNB Fitting LNB-Replace Sky LNB Reset LNB skew LNBs-Switching two LNBs 2 in 1 cable LNB-waterproof your Loft Boxes Magic eyes Make Fly-Lead Multiroom phone Multiswitches No Satellite Signal Omnisat Semitronic Orbital dish Phone Socket Wires Phone surge protect Plate-Twin-F Plugs-which? Plug-Top PSUs Plus Combiner Powermid+cable TV Powermid XL Reed Switches Remote Codes Remote Eyes Remote extenders RJ45 plugs Satellites-where Scart leads Self-Amalg Tape SelfSat Antenna Signal Combiners Signal Meter Silicone Grease Sky x2 same room Sky+ batteries Sky Digital Sky in Europe Sky Install DIY Sky LNB Sky LNB-extra Sky Multiroom Sky Remote Probs Sky room wiring Sky Plus Solder - How to Split Digibox RF Split Dish cable Split satellite signal Stacker-Destacker Stuck in standby Thomson Problems Tree blocks signal Triax minidish TV/VCR faults TV Links tvLINKplus TV set New TV eyes USALS Videosenders VisionLink Wall Plates WF125 Plugs What Channels Which plugs Wire my house 304114 wall plate Shop Index All Aerials Aerial Amplifiers Aerial Attenuators Aerial Boosters Aerial Filters Aerial Hardware Aerial Meters Aerial Splitters Audiophile Bargains Books to download Boosters, Amps Cable & Extensions Cable Joint Cable on Reels Capacitors Caravan/motorhome Car Radio Adapters CAT5-HDMI Components Computer Batteries Computer Leads Digibox spares DiSEqC Switches Dishes Dish Hardware DVD Players Earth rod Electrical - mains Electronic components Electronic Kits Electronic Kits 2 Extension - Coax Extension - mains Faceplates Filters electrical F Plugs Fly Leads Freeview cable Freesat Digiboxes FTA Digiboxes Freeview receivers Fuses Gaming Accessories German Sat TV HDMI / Audio Headphone Amp Home Cinema Installation kits Leads + Plugs LED Torches LNB cable LNBs for Sky LNBs 40mm LNBs C120 LNB switches LNB amplifiers Loft Boxes Magic Eyes Mains Electrical Meters Motorhome Motorised dish bits Multiswitches Power supplies Remote Controls Remote extenders Resistors RF Cable RF Modulators Satellite Cable Satellite Meters Scart Leads Screen Cleaning Signal Combiner Sky Digiboxes SkyLink Amplifiers SkyLink Bypass Splitters Telephone cable Thomson PSU Tools Grease Glue Transistors TV Eyes TV Plugs TV Wall Brackets Videosenders Video/Leads Wall plates 1 Wall plates 2 Technical Index FAQs BLOG Contact Us		Problems with Terrestrial Reception? Problem just began? Interference? Never worked? Day/night-time difference? Indoor aerials Loft aerials "Ariel" - nothing to do with "aerial" !! Problem just began? Something changed? Have you just added a new TV/receiver which has a more/less sensitive tuner? Have you forgotten to "scan for channels" on the new equipment? Have you scanned on old equipment not designed for Freeview 2009? Have you disconnected a power supply? Has someone been in the loft and disturbed a connection? Have you changed the position of something? (put it back) Is there a new structure in your area? (e.g. building, crane, gas tank.) Has a structure in your area been removed? Trees growing in line of sight now in full leaf/wet? Local interference caused by faulty street light or mobile phone mast? Is there water in your aerial cable? Is your aerial cable old or not double-screened? Has your local transmitter changed frequencies, requiring a different aerial? Was it working OK then suddenly started to have problems? Do not rescan yet! (If you scan while signals are missing, the receiver will "forget" them and, even if you fix the fault, it will not display the programmes until you scan again. This gets you into an endless loop of repeated scanning.) So do not rescan unless you are certain that the signal is perfect. Check it with a different receiver. Try rebooting the digital receiver or digital TV set. (Switch power off at the wall socket, count to twenty then switch back on). Test your Freeview receiver or Freeview TV set on a neighbour's aerial*. If it works OK then check these points (make notes of everything). Are your neighbours suffering the same problem? Has your aerial moved? Is the fly-lead invisibly damaged? (Try replacing it.) Is the wall socket invisibly damaged? (Inspect connections.) Is the wall socket an unscreened type? Do you have an amplifier in the loft or outside which is no longer working? Is the amplifier power supply unplugged or faulty? Is the cable OK? Check its entire length for signs of abrasion/water ingress/kinks, especially if a cowboy installer trailed it over tiles. Are all the cable connections OK? (Inspect them.) Is the weather bad; moving tree branches in the signal path; moving the aerial? Is the aerial in the loft? (Wet tiles and leaves on trees will reduce the signal.) Is the Freeview box too close to other equipment? (Interference can occur.) Does a different Freeview receiver work in your house? (Please find out. If it does then your own is faulty). Has the broadcaster changed some transmission parameters? (You might need to delete all, and then rescan channels). Is there any work scheduled for your local transmitter? Something interfering - computer, wireless router, portable phone? *If you can't test your receiver on a neighbour's aerial, do buy or borrow another Freeview receiver and use that to test your aerial system. It's essential to be certain that your Freeview receiver is OK before you spend money on an aerial system that might be perfectly good! Most people don't realise that the old coaxial aerial cable usually needs to be replaced. Many modern TV sets chuck out unbelievable amounts of "digital" interference that gets into the aerial cable and causes havoc. Even simply replacing the "fly lead" can solve many problems. It's amazing that people will spend over £1000 on a TV but forget to upgrade the 50p fly lead connecting it to the wall socket. (And the socket should be replaced with a shielded type, too!) See our on-line shop for all these parts.   If you can't replace ALL of the aerial cable, replace the bottom section that feeds the wall plate. You may be able to access it in the wall and join a new section of cable to it. Even replacing just the lowest 2 metres could help. Use 'F' connectors and a threaded coupler to make the join. The "weakest link" is often the "fly lead" that connects your Freeview box to the wall plate. If you pull it hard or trip over it, you can damage it internally. People are quite happy to pay hundreds of pounds on an aerial system then spend 50p on a "clothes line" patch lead behind the TV. As this position is one that is susceptible to lots of interference from the TV, Video, DVD and Freeview box itself, any cables here must be high-quality double-screened. You can make them yourself with leftover cable or you can buy them ready-made. The Picture shows our professional CO02D lead. You are not paying for fancy (but unnecessary) gold plating here. It's just a good, sturdy, double-screened flexible lead. And we can supply them in different colours so you can colour-code your connections so it's easy to see which fly-lead goes where. To order yours go to our order page by clicking HERE. But if you prefer DIY, there's more photos and a movie you can watch. Click HERE. Sturdy but flexible. Minimum recommended bend radius 50 mm (2"). Here is a totally unscreened wall plate (rear view). You can see around 20 mm of the coaxial centre core is unshielded and, therefore, able to receive and transmit interference like a small aerial. The braided copper screen of the cable is clamped so tightly that the air-core plastic dielectric has been crushed. This will cause an impedance discontinuity that can cause serious problems such as "some channels missing" or simply poor quality pictures or digital pictures "breaking up". Note: the connection in the wall plate can SNAP! It can happen, so please check it carefully. The Freeview box should be connected to the aerial with a continuous run of double-screened coaxial cable (as used for satellite TV). Any joints or wall plates must also by fully shielded. If you need to split the signal to more than one Freeview box or TV then an ordinary splitter will lose around 60% of the signal! The correct way to do it, if your signal is not strong, is with a "masthead amplifier". If you have "lines on the picture" or "ghosting" then this is caused by something after the Freeview box (or a faulty box). Try connecting the box to your TV with a new fully screened Scart lead. (By the way, the only reason this is gold-plated is that we can't get one like this that isn't!) DO NOT STACK EQUIPMENT! Freeview boxes, in particular, are very susceptible to the effects of heat and interference from other equipment. They should be installed on a cool shelf (not metal) away from other equipment. The proximity of metal can interfere with correct operation. If you do experience problems, move your Freeview box at least a metre away from your TV and from other electronic equipment and see if that helps. Another common problem: You've got a video recorder (or similar) connected in line and you've left it switched on. Its RF output is blocking a Freeview multiplex. Other problems - typically "no signal" or "picture breaks up into squares" may be caused by the VCR or by insufficient signal or by interference getting into the aerial system (which includes the aerial, the down lead and anything connected in it). Interference Interference is radiated by electronic equipment such as DECT phones, lamps, electric fences, energy-saver lamps, computers, wireless routers, microwave ovens, video senders, laptops, DVDs, TV sets ... and can affect other electronic equipment - especially equipment that is designed for receiving extremely weak signals. (If you don't believe this, try holding an AM radio next to them!) The interference is usually strongest behind the TV set so you must ensure that all coaxial "fly leads" and wall plates are fully shielded, otherwise the interference gets carried back into the Freeview or TV tuner! If you think you have problems of interference, move the Freeview receiver well away from the TV set (a source of interference), and the VCR/DVD, and switch off all other equipment in the house, including TV sets, DVD players, fluorescent and energy-saver lights, electronic insect frighteners/killers, computers and central heating. (Dimmer switches can cause problems). If this gets rid of the problem, switch everything back on, one by one, to track down the cause. If it's a thermostatic switch or an ordinary switch, it may be possible to fit a suppressor. If the source of interference can't be traced that way, see if you can hear it on any waveband on a portable radio or TV set. Tune it off-channel until you can hear the interference. Then walk around to see if you can pinpoint the direction. It could be a street lamp (common) or something in a neighbour's house. You need to determine where the interference is getting into your aerial system. This is far from easy so all you can do is take "belt and braces" measures to prevent it. Mount the aerial as far from sources of interference as possible. Use fully-shielded aerial wall-socket (if used). Use fully-shielded coax and run it as far from electrical cables as possible (never alongside them). Fit suppressors to equipment that is known to be causing problems. Make sure you have adequate signal in the cable by using a very low noise masthead amplifier as close to the aerial as possible and an equivalent attenuator at the aerial-input of the receiver. Various types of filter are available which might help. Tropospheric Propagation At certain times of year you may receive interference from transmitters which are hundreds of miles away. Sometimes, for example, people in Essex can do a scan and tune in broadcasts coming from (say) Winter Hill in the North West, or from Holland. There is seldom a cure for this and it usually lasts for only a few hours a day for up to a week. DO NOT RESCAN while this is happening! The last thing you want is for your receiver to memorise foreign stations. Has it never worked properly? Are you using the correct aerial for your location? Is it outdoors? Is it aligned on the correct transmitter? Is your Freeview receiver a good one? (Some cheap modern ones have very poor tuners that require a strong aerial signal. You can waste a lot of money on aerial systems when it's your cheap supermarket receiver or digital TV that's at fault!) Is the signal strength correct? While analogue TV is still broadcast, the analogue signal is much stronger than the digital signal. The result is that, if your digital signal strength is high, the analogue will be even higher. In some areas, having the digital signal higher than 50% means that the analogue signal will be strong enough to "blind" your digital tuner, so the weakest stations may not be receivable. However, don't be fooled by a low signal reading. If the analogue signal is way too high, it can cause the digital tuner to "wind down its gain factor", causing the signal reading to appear very low or to "bounce"! You really need to get an expert opinion on the correct signal strength for your location. If it's too high, you may need to fit an attenuator. (A signal reading over 60% is questionable. Over 80% is likely to be too high). Is everything screened? Make sure the wall plate is fully shielded. Make sure any fly leads use double-screened cable. Make sure your down lead from the aerial is the double-screened type with no kinks or intermediate connections. If that's OK, maybe you need a better aerial or maybe a booster will help. Click HERE for information about aerial boosters and connecting to more than one TV set or Freeview box. To get a FREE report on Freeview reception at your postcode location, click HERE. Need a good indoor aerial? Click HERE. Need more help? Contact us with your full postcode, complete description of your equipment (makes and model numbers) and details of the problem plus the results of all the checks we have suggested on this page. Daytime/night time difference? The Freeview signal strength drops slightly during the hours of daylight. If you have good reception at night but poor during the day, it's most likely that your aerial system is marginal. Check out everything mentioned above relating to correct aerial, cable, wall plate etc. If your reception is worse at night then your signal may be too strong or you may be suffering from local electrical interference. Wet leaves or wet tiles If your reception deteriorates during falling rain, the cause is likely to be wet leaves or wet tiles in the signal path. Rain by itself can also have an effect on reception if it is very heavy. Indoor Aerials Note: indoor aerials are notorious for causing problems because the signals can be reflected by nearby walls, roof tiles, pipes, wiring and even human bodies! The result can be signal cancellation, causing complete or partial loss of some channels. The positioning of the aerial can, therefore, be extremely critical. Even after you've got it "right", if something gets moved (even a metal object next door) the signal could be affected. Because of signal reflections and interference, the positioning of an indoor aerial is absolutely critical. An inch can make the difference between receiving all channels perfectly or none. (Each time you move the aerial during set-up you must rescan the channels. Once you've got all the channels, do not rescan!) I'd start by keeping the aerial as far from sources of interference as possible. The major source of interference is the TV set itself. (How many times have you seen an aerial perched on top of the TV and "wavy lines" on the picture?) Other sources of interference include electrical wiring and electrical equipment - especially equipment fitted with a thermostat. So don't do the ironing next to the aerial! Placing the aerial on top of (or above) a metal structure can sometimes help. Try a metal CD rack or a (cold) radiator. Try varying the height. In a bedroom, on top of a wardrobe is often a good choice. Try putting aluminium foil on the wall behind the aerial to reflect the signal. (The results are unpredictable but it sometimes helps). If possible, aim the aerial through a window or (if in a loft) through tiles not brick. This is pretty obvious but most people overlook the fact that solid materials attenuate the signal. So, you have three main factors to deal with: Attenuation of signal due to material in the way Cancellation of signal due to out-of-phase reflections Interference from mains wiring and electrical/electronic equipment If you can't get all channels with an indoor aerial, try this: Connect your Freeview receiver temporarily to a better aerial pointing at the same transmitter. Run a channel search and make sure all the channels are stored. Now reconnect the indoor aerial and move the aerial to get as many channels as possible. DO NOT RESCAN. If you later lose some channels DO NOT RESCAN. Move the aerial until you get them back. (If you rescan while the signal is too weak, the receiver will "forget" the weak channels). Why does it work like this? A Freeview receiver will only store a multiplex if the signal is somewhat higher than the tuner minimum "threshold". If the signal is too low, the Freeview box will see it but will not store it. However, if you give it a nice strong signal, the multiplex position will be stored and remembered. Provided that the weaker signal is above the tuner threshold value, you'll be able to watch the programmes. Note, however, that they are likely to be more stable at certain times of day (usually after dusk) and that, at some times of day, the picture or sound may "break up". Loft aerials can be troublesome because they are so close to house wiring, human bodies in the bedroom, water tank (reflections), roof (attenuates signal - especially when wet). Make sure that the roof is not lined with a reflective metallic layer! Arrange the aerial so it is pointing through tiles, not bricks. The centre of a loft is often the worst position because interference tends to be concentrated there. Make sure that cable is fully shielded type and does not run parallel to any mains cables. If the aerial itself is picking up interference then you might be able to shield it with a "ground plane" at least 0.5m below it. However, the chances of success are small. If the cable is picking up interference then try amplifying the signal from the aerial with a very low-noise masthead amplifier and attenuating it at each receiver. What's the best indoor aerial? For lots more information including choice of aerial, installing an aerial, read our "Freeview Bible". I can only record the Freeview programme that I'm watching! Your Freeview box has only one tuner so obviously it can tune to only one programme at a time. If you want to improve on this you'd have to buy a twin-tuner Freeview "PVR" with Hard Drive inside or buy another cheap Freeview box. Make sure that it's NOT the same make as your existing one, otherwise the remote will operate both boxes simultaneously! To email us for specific help regarding your Freeview reception, please click HERE. ©2006-2011 SatCure Send this page address - CLICK HERE - to a friend !