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DISH SETUP: Single sat, Multi-Sat & Motorised
Anti-interference filter for c-band
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<blockquote data-quote="s-band" data-source="post: 1066511" data-attributes="member: 407744"><p>As CH says, the first thing to do is to find out the frequencies of the interferers. If you have a spectrum analyser it's easy. Try to get one if possible (a general purpose one, not a satellite meter type). If not, a SDR like the AD-Pluto will cover up to 6GHz after a tweak. You might be able to use an LNB off the dish and do a normal scan but if the signals are strong the results will be confusing.</p><p></p><p>If the interference is co-channel then a filter will not do anything. Your only hope, without complex electronics, is shielding as mentioned. If it's not too strong, even a small mesh chicken wire fence may help.</p><p></p><p>If the interference is out of your band it may be causing trouble by blocking (overloading the RX which will suppress the wanted signal) that will affect most or all of the band at once. A filter to remove the blocking signal(s) may fix it. Blocking caused by radar altimeters (4.2-4.3GHz) is easy to spot with an analyser or SDR on the IF as the wanted signal will be modulated (chopped) by the radar. Blocking caused by comms links may be continuous. Do you lose the whole band at once?</p><p></p><p>If it is out of band and causing intermodulation products (2 or more signals out of band mix to produce one or more in band) it will only affect some frequencies and may also be fixed by filtering.</p><p></p><p>The above assumes it is caused by C band interference. If it is at the IF the co-ax shielding improvement may help. To find out if this is a problem, disconnect the LNB at the dish and do a full IF scan.</p><p></p><p>I'm not sure if the filtered Titanium has an extra filter but it may just have a version of the pre-mixer filter found in standard one and cut off below 3.7GHz. If that's the case, the filter might help mild cases but that's unlikely if you are line of sight to the source. If your interference is out of band, one of the waveguide filters is the best option.</p><p></p><p>Try this search string: <a href="https://www.google.com/search?q=wll%20interference%20c%20band" target="_blank">wll - Google Search</a> interference c band <link fixed></p><p></p><p><Edit> Written before your last post, additional comments:</p><p>Looking at the plots, it appears to be in-band interference so the shielding may be your only option. If you have lost SNR on other signals, there may also be blocking or intermodulation,</p><p>Shielding: <a href="http://www.satsig.net/satellite/reducing-interference-satellite-tv.htm" target="_blank">Interference into satellite dish: reduction by using site shielding</a></p></blockquote><p></p>
[QUOTE="s-band, post: 1066511, member: 407744"] As CH says, the first thing to do is to find out the frequencies of the interferers. If you have a spectrum analyser it's easy. Try to get one if possible (a general purpose one, not a satellite meter type). If not, a SDR like the AD-Pluto will cover up to 6GHz after a tweak. You might be able to use an LNB off the dish and do a normal scan but if the signals are strong the results will be confusing. If the interference is co-channel then a filter will not do anything. Your only hope, without complex electronics, is shielding as mentioned. If it's not too strong, even a small mesh chicken wire fence may help. If the interference is out of your band it may be causing trouble by blocking (overloading the RX which will suppress the wanted signal) that will affect most or all of the band at once. A filter to remove the blocking signal(s) may fix it. Blocking caused by radar altimeters (4.2-4.3GHz) is easy to spot with an analyser or SDR on the IF as the wanted signal will be modulated (chopped) by the radar. Blocking caused by comms links may be continuous. Do you lose the whole band at once? If it is out of band and causing intermodulation products (2 or more signals out of band mix to produce one or more in band) it will only affect some frequencies and may also be fixed by filtering. The above assumes it is caused by C band interference. If it is at the IF the co-ax shielding improvement may help. To find out if this is a problem, disconnect the LNB at the dish and do a full IF scan. I'm not sure if the filtered Titanium has an extra filter but it may just have a version of the pre-mixer filter found in standard one and cut off below 3.7GHz. If that's the case, the filter might help mild cases but that's unlikely if you are line of sight to the source. If your interference is out of band, one of the waveguide filters is the best option. Try this search string: [URL='https://www.google.com/search?q=wll%20interference%20c%20band']wll - Google Search[/URL] interference c band <link fixed> <Edit> Written before your last post, additional comments: Looking at the plots, it appears to be in-band interference so the shielding may be your only option. If you have lost SNR on other signals, there may also be blocking or intermodulation, Shielding: [URL='http://www.satsig.net/satellite/reducing-interference-satellite-tv.htm']Interference into satellite dish: reduction by using site shielding[/URL] [/QUOTE]
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DISH SETUP: Single sat, Multi-Sat & Motorised
Anti-interference filter for c-band
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