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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
C-Band Reception, UK and Europe
5G interference, new LNB?
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<blockquote data-quote="s-band" data-source="post: 1129496" data-attributes="member: 407744"><p>I don't have any C band installed at the moment but checked out the levels using an analyser with a 2dB NF LNA and a wide band horn (~7dB gain). The peak level, corrected for the LNA, was about -35dBm. It may be a fair bit higher as I was only looking in 300kHz & 1MHz BW and the signals are wider than that, all are pulsed. The frequency range of most of them was similar to your's, [USER=268811]@aceb[/USER] (3.58-3.68GHz). The frequency spectrum shows max hold as blue and live as black. The time domain plot shows the pulse characteristics. I don't know how far I am from the sources of these signals but it is at least 3 miles.</p><p></p><p>[ATTACH]142261[/ATTACH] [ATTACH]142262[/ATTACH]</p><p></p><p>Given ~60dB gain in an LNB, the level I was seeing will overload and cause blocking across the whole range. [USER=268811]@aceb[/USER]'s CS scan shows >0dBm out of the LNB which may be close to limiting. I don't know the C138 LNB but if the filter is the same as the other Tit ones, it is not particularly sharp and after the LNA so might not do enough. It's well worth a try though.</p><p></p><p>If money were no object, this is the kind of thing to use: <a href="https://www.norsat.com/collections/5g-c-band-interference-solution/products/c-band-extreme-bandpass-filter-7" target="_blank">C-Band Extreme Bandpass Filter</a></p></blockquote><p></p>
[QUOTE="s-band, post: 1129496, member: 407744"] I don't have any C band installed at the moment but checked out the levels using an analyser with a 2dB NF LNA and a wide band horn (~7dB gain). The peak level, corrected for the LNA, was about -35dBm. It may be a fair bit higher as I was only looking in 300kHz & 1MHz BW and the signals are wider than that, all are pulsed. The frequency range of most of them was similar to your's, [USER=268811]@aceb[/USER] (3.58-3.68GHz). The frequency spectrum shows max hold as blue and live as black. The time domain plot shows the pulse characteristics. I don't know how far I am from the sources of these signals but it is at least 3 miles. [ATTACH alt="3.6GHz_5G-2.gif"]142261[/ATTACH] [ATTACH alt="3608MHz_5G_Time.gif"]142262[/ATTACH] Given ~60dB gain in an LNB, the level I was seeing will overload and cause blocking across the whole range. [USER=268811]@aceb[/USER]'s CS scan shows >0dBm out of the LNB which may be close to limiting. I don't know the C138 LNB but if the filter is the same as the other Tit ones, it is not particularly sharp and after the LNA so might not do enough. It's well worth a try though. If money were no object, this is the kind of thing to use: [URL='https://www.norsat.com/collections/5g-c-band-interference-solution/products/c-band-extreme-bandpass-filter-7']C-Band Extreme Bandpass Filter[/URL] [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
C-Band Reception, UK and Europe
5G interference, new LNB?
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