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Satellite TV receivers & systems support forums
Fringe Reception General
Cooling the LNB
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<blockquote data-quote="BombedOne" data-source="post: 691124" data-attributes="member: 300998"><p>Hehe <img src="https://www.satellites.co.uk/styles/default/xenforo/smilies/smile.png" class="smilie" loading="lazy" alt=":)" title="Smile :)" data-shortname=":)" /></p><p></p><p>Let me share my achievement in this area:</p><p></p><p>Liquid nitrogen: Does not worked</p><p>Reason: I applied it too rapidly, LNB cracked in middle and cable went into dust-like condition in about 4 seconds. Then I ran out of liquid nitrogen.</p><p></p><p>Regarding alternate cooling methods, I've built and bench-tested 3 stage peltier cooled design, which is free from problems you've mentioned above, and also works with default C120 feedhorn. The reason that project is stopped - lack of free money to buy effective peltier modules (need about $150 for them). Initial experiments were conducted with weak, cheap peltiers.</p><p></p><p>Drawings of my construction are on paper only, no digital version yet. Structure is as follows - 3 peltier modules are interconnected to each other via 10mm thick copper shims. The cold end touches inverto white tech flange LNB (as the smallest one available), which is sealed airtight in plastic box, filled with silicagel. The feedhorn is attached through teflon 0-ring. the hot end of peltier module assembly touches the feedhorn, warming it up, and avoiding condensation on it. I easilly achieved 30C delta of temperatures by using 3 cheap (~$15 ea) peltiers. With expensive ones (and better power supply), I think 50C is achievable, which looks much more interesting.</p><p></p><p>On the attached picture you can see very schematic representation of my design.</p></blockquote><p></p>
[QUOTE="BombedOne, post: 691124, member: 300998"] Hehe :) Let me share my achievement in this area: Liquid nitrogen: Does not worked Reason: I applied it too rapidly, LNB cracked in middle and cable went into dust-like condition in about 4 seconds. Then I ran out of liquid nitrogen. Regarding alternate cooling methods, I've built and bench-tested 3 stage peltier cooled design, which is free from problems you've mentioned above, and also works with default C120 feedhorn. The reason that project is stopped - lack of free money to buy effective peltier modules (need about $150 for them). Initial experiments were conducted with weak, cheap peltiers. Drawings of my construction are on paper only, no digital version yet. Structure is as follows - 3 peltier modules are interconnected to each other via 10mm thick copper shims. The cold end touches inverto white tech flange LNB (as the smallest one available), which is sealed airtight in plastic box, filled with silicagel. The feedhorn is attached through teflon 0-ring. the hot end of peltier module assembly touches the feedhorn, warming it up, and avoiding condensation on it. I easilly achieved 30C delta of temperatures by using 3 cheap (~$15 ea) peltiers. With expensive ones (and better power supply), I think 50C is achievable, which looks much more interesting. On the attached picture you can see very schematic representation of my design. [/QUOTE]
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Fringe Reception General
Cooling the LNB
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