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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		UK Aerial Groups Visualising with the aid of pictures The UHF (Ultra High Frequency) spectrum in the UK is divided into "groups" of channels from 21 to 68. UHF aerials are manufactured to provide good reception in a specific group so it is a good idea to determine the "group" used by your chosen local transmitter and buy a suitable aerial. A so-called "wideband Yagi" aerial usually works best in the channel range 35 to 68 so it will not provide a strong signal from a "Group A" transmitter, such as Crystal Palace or Rowridge. Indeed, because it works best for channels higher than those in "Group A" it may collect a lot of interference from other transmitters. The peak gain (amplification) of a "wideband" aerial is not as high as the peak gain of a "Group" aerial. The only true "wideband aerial is the "log-periodic" type, which works well across the whole UHF spectrum, from 21 to 68. This is a safe bet for most areas. By the end of 2012, UHF channels 61 - 68 will be taken over by 4G mobile phone transmissions and many areas will require filters to remove these channels, in order to prevent interference. Only those people served by Group A and Group B transmitters are reasonably immune from such interference because filters are already available. We anticipate that a "4G exclusion" filter will become available when the problems begin. Bandpass Filters To minimise interference from outside your local "Group" you can fit a "Bandpass filter" that passes only signals from your desired channel group.   Diplexers A "diplexer" is a double filter that combines (or separates) two adjacent groups of channels. It allows you to connect two aerials to a single cable without creating interference from overlapping channels. It allows you to separate groups of channels (for example radio and TV channels).   Full Spectrum The whole frequency spectrum covers FM radio, DAB radio, TETRA emergency services radio, VHF TV, UHF TV and LNB signals (which are restricted to a cable connection - not transmitted). Here is a graph that compares the log-periodic aerial with "Group A" and "Wideband" Yagi aerials. If you need more help in understanding this information, please contact our Technical Department.   ©2011 SatCure