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Satellite TV receivers & systems support forums
Fringe Reception General
0.01dB lnb?
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<blockquote data-quote="Hitchcock" data-source="post: 189606" data-attributes="member: 196478"><p>Hi divibi,</p><p></p><p>I don't know what the physical limit is, I asked a question about this once, and I was told that there is always some background noise, 4 deg Kelvin, which corresponds to a noise figure of 0.06 dB.</p><p></p><p>I also asked a reputable LNB manufacturer once, SMW, and they told me they were using the best transistors (HEMT) available at the time, their top-perfoming LNB has a noise figure of 0.8 dB and it is the same noise figure they had back in 1995. With the arrival of the Invacom 0.3 dB back in 2002 I could finally see a better picture over what the SMW 0.8 dB offered, but not by very much. Going by the actual improvement I saw over the SMW, the Invacom is probably no better than 0.5 dB in reality.</p><p></p><p>As for golden LNBs etc, someone once told me that if you coated the 'needle' inside your LNB with pure gold, you would improve your signal a tiny bit ... I have no idea if you could actually see this improvement on your TV screen though.</p><p></p><p>Your idea about sub zero cooling is interesting. Maybe we could try something like this (photo stolen from the web)!</p><p></p><p><img src="http://www.soneraplaza.fi/GetImages/GetImages_GetImage_jpg/0,2600,30961,00.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="Hitchcock, post: 189606, member: 196478"] Hi divibi, I don't know what the physical limit is, I asked a question about this once, and I was told that there is always some background noise, 4 deg Kelvin, which corresponds to a noise figure of 0.06 dB. I also asked a reputable LNB manufacturer once, SMW, and they told me they were using the best transistors (HEMT) available at the time, their top-perfoming LNB has a noise figure of 0.8 dB and it is the same noise figure they had back in 1995. With the arrival of the Invacom 0.3 dB back in 2002 I could finally see a better picture over what the SMW 0.8 dB offered, but not by very much. Going by the actual improvement I saw over the SMW, the Invacom is probably no better than 0.5 dB in reality. As for golden LNBs etc, someone once told me that if you coated the 'needle' inside your LNB with pure gold, you would improve your signal a tiny bit ... I have no idea if you could actually see this improvement on your TV screen though. Your idea about sub zero cooling is interesting. Maybe we could try something like this (photo stolen from the web)! [IMG]http://www.soneraplaza.fi/GetImages/GetImages_GetImage_jpg/0,2600,30961,00.jpg[/IMG] [/QUOTE]
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Satellite TV receivers & systems support forums
Fringe Reception General
0.01dB lnb?
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