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Satellite TV receivers & systems support forums
Fringe Reception General
Cooling the LNB
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<blockquote data-quote="Channel Hopper" data-source="post: 543170" data-attributes="member: 175144"><p>Venting the LNB circuitry directly to the air ( or a bespoke dehydrator system) achieves this without the need to tranfer the heat elsewhere.</p><p></p><p></p><p></p><p></p><p></p><p>That was what I was doing a decade ago, (working on a minimum cost also had its own advantages)</p><p></p><p></p><p></p><p></p><p>Which comes back to the almost impossible task of removal of the humidity out of the air.</p><p></p><p>Optics (binoculars/telescopes) use a nitrogen or other inert atmosphere, but again this requires hermetical sealing, almost impossible where a microwave transparent feedhorn is a neccessity. </p><p></p><p>When carrying out tests, it was found that cooling of the air inside the feedhorn (and the feedhorn itself) also improved the C/N ratio, however the advantages were only 5%-10% that of freezing the LNB directly.</p><p></p><p></p><p></p><p></p><p>See above, but since the feed is in outside air, venting occurs naturally and the natural focus of the dish provides additional heat to stave off any permanent buildup of ice (in the UK anyway). </p><p>Did I mention that I sold dehydrators and Ice heaters for quite a few years in the commercial sector ?</p><p></p><p></p><p></p><p></p><p></p><p>Lagging does not reduce condensation, this is at the crux for correcting your responses.</p><p></p><p></p><p></p><p></p><p></p><p>Ugly dishes ?</p></blockquote><p></p>
[QUOTE="Channel Hopper, post: 543170, member: 175144"] Venting the LNB circuitry directly to the air ( or a bespoke dehydrator system) achieves this without the need to tranfer the heat elsewhere. That was what I was doing a decade ago, (working on a minimum cost also had its own advantages) Which comes back to the almost impossible task of removal of the humidity out of the air. Optics (binoculars/telescopes) use a nitrogen or other inert atmosphere, but again this requires hermetical sealing, almost impossible where a microwave transparent feedhorn is a neccessity. When carrying out tests, it was found that cooling of the air inside the feedhorn (and the feedhorn itself) also improved the C/N ratio, however the advantages were only 5%-10% that of freezing the LNB directly. See above, but since the feed is in outside air, venting occurs naturally and the natural focus of the dish provides additional heat to stave off any permanent buildup of ice (in the UK anyway). Did I mention that I sold dehydrators and Ice heaters for quite a few years in the commercial sector ? Lagging does not reduce condensation, this is at the crux for correcting your responses. Ugly dishes ? [/QUOTE]
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Fringe Reception General
Cooling the LNB
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