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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Inverto Black Ultra or Inverto Premium twin LNB
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<blockquote data-quote="s-band" data-source="post: 1115214" data-attributes="member: 407744"><p>The claims of 0.2dB NF drive me nuts. The GaAsFETs can only do 0.4dB, at room temperature, and that's without circuit losses. You'll be lucky to get 0.6dB even with super tweaking at Ku. If it's true, why pay £10k+ for a cryo LNA when you can get better noise temperature from a domestic LNB? <a href="http://www.callisto-space.com/en/page/compact-cryogenic-lna-2.php" target="_blank">Compact Cryogenic LNA</a></p><p></p><p>Ignore the BS but in some respects these LNBs may be worth trying. e.g. 22dB X pol rejection, low phase noise etc. However, >22dB X pol rejection on a real domestic dish? That's going to make more difference than scratching around for a tiny bit lower NF especially on something like 0.8W.</p><p></p><p>Here are some measurements from a few years ago: <a href="https://satellites.co.uk/forums/threads/invacom-0-3db-vs-octagon-pll-vs-smw-pll-ku-lnbs.169134/post-981544" target="_blank">Just Sharing This - Invacom 0.3dB vs. Octagon PLL vs. SMW PLL Ku LNBs</a></p></blockquote><p></p>
[QUOTE="s-band, post: 1115214, member: 407744"] The claims of 0.2dB NF drive me nuts. The GaAsFETs can only do 0.4dB, at room temperature, and that's without circuit losses. You'll be lucky to get 0.6dB even with super tweaking at Ku. If it's true, why pay £10k+ for a cryo LNA when you can get better noise temperature from a domestic LNB? [URL="http://www.callisto-space.com/en/page/compact-cryogenic-lna-2.php"]Compact Cryogenic LNA[/URL] Ignore the BS but in some respects these LNBs may be worth trying. e.g. 22dB X pol rejection, low phase noise etc. However, >22dB X pol rejection on a real domestic dish? That's going to make more difference than scratching around for a tiny bit lower NF especially on something like 0.8W. Here are some measurements from a few years ago: [URL="https://satellites.co.uk/forums/threads/invacom-0-3db-vs-octagon-pll-vs-smw-pll-ku-lnbs.169134/post-981544"]Just Sharing This - Invacom 0.3dB vs. Octagon PLL vs. SMW PLL Ku LNBs[/URL] [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Inverto Black Ultra or Inverto Premium twin LNB
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