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Satellite TV receivers & systems support forums
Fringe Reception General
Nilesat 301 on Extended Ku in UK
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<blockquote data-quote="s-band" data-source="post: 1143536" data-attributes="member: 407744"><p>I was using an <a href="https://smw.se/product/multiband-pll-lnb-ku-band/" target="_blank">SMW Q-PLL</a> Type R set to 11.3GHz LO but would normally use a modified single band SMW LNB as pictured. The plots are processed outputs from a spectrum analyser. The spectrum is normalised by subtracting the clear sky capture from the one from the target. I had to use a 1Hz video bandwidth and a lot of averaging to reduce the noise. </p><p></p><p>[ATTACH]147913[/ATTACH]</p><p></p><p>Note that if you use normal LNBs for DVB, some extra gain and a high pass filter is needed in the IF chain to remove any signals below 12.75Ghz which may overload the DVB card. The only normal LNBs that I have found to work are the SMW ones with 11.3GHz LO options. Even than, they really need to be tweaked for use at 13.5GHz.</p></blockquote><p></p>
[QUOTE="s-band, post: 1143536, member: 407744"] I was using an [URL='https://smw.se/product/multiband-pll-lnb-ku-band/']SMW Q-PLL[/URL] Type R set to 11.3GHz LO but would normally use a modified single band SMW LNB as pictured. The plots are processed outputs from a spectrum analyser. The spectrum is normalised by subtracting the clear sky capture from the one from the target. I had to use a 1Hz video bandwidth and a lot of averaging to reduce the noise. [ATTACH]147913[/ATTACH] Note that if you use normal LNBs for DVB, some extra gain and a high pass filter is needed in the IF chain to remove any signals below 12.75Ghz which may overload the DVB card. The only normal LNBs that I have found to work are the SMW ones with 11.3GHz LO options. Even than, they really need to be tweaked for use at 13.5GHz. [/QUOTE]
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Satellite TV receivers & systems support forums
Fringe Reception General
Nilesat 301 on Extended Ku in UK
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