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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Adapting a Prodelin Polariser.
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<blockquote data-quote="John" data-source="post: 1063985" data-attributes="member: 175005"><p>.. Moving on to the trickier bit - producing a smooth rotating RF tight as best as can be achieved joint between the Prodelin polariser and the beautifully machined lnb flange assembly. In normal configuration the polariser had a 5mm x 2.4mm deep channel for the rubber weather seal at one end and the lnb assembly also had the same dimension channel. Luckily the polariser has the exact dimensions inside from one end to the other so it didn't matter which way around it pointed at the dish face - - this proved to be a big bonus as the two machined seal channels matched up perfectly when the polariser and lnb assembly were placed together and basically formed a nearly 5mm square channel-ideal for inserting the right amount of 5mm stainless ball bearings to form a continuous metal RF seal and also a nice smooth rotating joint. The next problem was how to find a cheap way to keep the two assemblies together. A few pics below to go with this narrative.</p><p>.....................................................................................................................................................................................................................................................................................................</p><p></p><p>[ATTACH=full]121348[/ATTACH][ATTACH=full]121349[/ATTACH][ATTACH=full]121350[/ATTACH][ATTACH=full]121351[/ATTACH]</p></blockquote><p></p>
[QUOTE="John, post: 1063985, member: 175005"] .. Moving on to the trickier bit - producing a smooth rotating RF tight as best as can be achieved joint between the Prodelin polariser and the beautifully machined lnb flange assembly. In normal configuration the polariser had a 5mm x 2.4mm deep channel for the rubber weather seal at one end and the lnb assembly also had the same dimension channel. Luckily the polariser has the exact dimensions inside from one end to the other so it didn't matter which way around it pointed at the dish face - - this proved to be a big bonus as the two machined seal channels matched up perfectly when the polariser and lnb assembly were placed together and basically formed a nearly 5mm square channel-ideal for inserting the right amount of 5mm stainless ball bearings to form a continuous metal RF seal and also a nice smooth rotating joint. The next problem was how to find a cheap way to keep the two assemblies together. A few pics below to go with this narrative. ..................................................................................................................................................................................................................................................................................................... [ATTACH type="full" alt="Prodelin poloriser sealing ring channel ... reduced image..jpg"]121348[/ATTACH][ATTACH type="full" alt="Prodelin lnb flange ... reduced image..jpg"]121349[/ATTACH][ATTACH type="full" alt="Prodelin poloriser weather seal detail .... reduced image.JPG"]121350[/ATTACH][ATTACH type="full" alt="Prodelin poloriser with 99% of channel filled with 5mm bearings.... reduced image..jpg"]121351[/ATTACH] [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Adapting a Prodelin Polariser.
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