© Proeye Communications & Security Systems 2011 Q) I am receiving signals in the C-Band range which is 3.7-4.2GHz in Australia and at times the picture pixelates. A). There can be a number of reasons what causes the received broadcasts to pixelate and can be related to; • Alignment of the dish, as it may have moved slightly out of position causing the signal level to drop out from time to time, or • Faulty LNB, I have had to replace faulty LNB's which were not operating correctly any more, or • Wireless telecommunications services causing interference to typical wideband or poorly designed LNB’s. Wideband LNB’s which            have an input range of 3.4-4.2GHz. are more susceptible to interference caused by the increasing number of telecommunications            services using the 3GHz spectrum. Suitable 3.7-4.2GHz LNB’s with high rejection is usually required resolve most interference            issues affecting the LNBF. • Some types of interference signals may be within the 3.7-4.2 GHz range and can be more costly to resolve.            From experience we have found in some instances  moving the satellite dish to another location on the property            resolves the problem, reducing the need to purchase expensive filters. Q) Why are other transmitters allowed to cause interference to my satellite reception? Local telecommunications services can be licensed to operate adjacent or within the satellite C-Band spectrum which ranges from 3.7 to 4.2 GHz in Australia. Services include WiMax and point to point radio links. These local services can cause harmful interference to C-Band satellite receiving systems which in most situations can be resolved. If the interference is in the adjacent spectrum, for example 3.5GHz, then changing the LNBF can solve the problem. Most off the shelf domestic LNBF’s use an input range of 3.4 to 4.2 GHz and amplify the signal from 60 to 63 dB or approximately by a factor of 1 to 2 million. Therefore the signal from a local transmitter service operating at 3.5 GHz will cause severe interference to the LNBF. To resolve the problem the LNBF should be replaced with a suitable LNB or LNBF that uses the correct input range of 3.7 to 4.2 GHz. In some cases where the signal from the local telecommunications service is at extremely high levels, the satellite TV receiving system requires a commercial LNB engineered to withstand the adjacent signals, which we have available. The photo below illustrates a real example of a commercial LNB we applied to resolve extremely high levels of interfering signals caused by a local WiMax service at 3.5GHz at Werribee Victoria. Satellite interference tip! Diagnostic Service We provide diagnostic service to identify and resolve satellite reception interference issues. If your satellite or TV picture often pixelates and you cannot resolve it, contact us and we may be able to resolve it for you! Satellite Interference information Intelsat Interference to C-Band Presentation European Satellite Operators Association Satnews Daily - C-Band FrequencySpectrum Safeguard (But not  Australia as it is in Region 3) SUIRG, Inc, When Broaddband Wireless and Satellite Services Collide SUIRG Communications Day, issue 3035, Satcom, broadcast & 3G lobbies slam ACMA wireless broadband proposals SatMagazine, Satellite and WiMax Asia-Pacific Telecommunity Fixed Satellite service and WiMax coexistance ITU Speech Houlin Zhao ITU Dep Secretary-General CASBAA Satellite Industry Forum 2009