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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
C-Band Reception, UK and Europe
C Band back on the 1.8 Channel Master
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<blockquote data-quote="RimaNTSS" data-source="post: 928338" data-attributes="member: 312276"><p>[USER=191372]@scopus[/USER] Nice piece of engineering! Quiet complicated. ;)</p><p>It is well known that all those nice old dishes were designed for only one LNB and side arms are making some shedding. And if someone is trying to put additional LNBs on the same feedarms, than on the way from those LNBs towards the dish feedarm obstructing signal. And that is not good at all. </p><p>The best way to make multifeeds IMHO is making completely new feedarms. </p><p>That is what I made last summer for my Prodelin 1,8m. Side-arms have threaded bar inside, so can be extracted to any size (yellow circles) . Bottom feedarm, depending on length of side-arms and their connection place, can be fixed at any angle. </p><p>If we know the position of the Focal point (red dot) of the antenna (and we know it <img src="http://www.satellites.co.uk/styles/default/xenforo/smilies/rolleyes.gif" class="smilie" loading="lazy" alt=":rolleyes:" title="Roll Eyes :rolleyes:" data-shortname=":rolleyes:" /> ), than it is not so difficult to place LNB in such a way that it's Phase center is co-located with antenna's Focal point. </p><p>It was not my goal to make multifeed on my antenna, but I do not see any problems to put horizontal bar (green) and attach more LNB-holders. </p><p>[ATTACH]78591[/ATTACH]</p></blockquote><p></p>
[QUOTE="RimaNTSS, post: 928338, member: 312276"] [USER=191372]@scopus[/USER] Nice piece of engineering! Quiet complicated. ;) It is well known that all those nice old dishes were designed for only one LNB and side arms are making some shedding. And if someone is trying to put additional LNBs on the same feedarms, than on the way from those LNBs towards the dish feedarm obstructing signal. And that is not good at all. The best way to make multifeeds IMHO is making completely new feedarms. That is what I made last summer for my Prodelin 1,8m. Side-arms have threaded bar inside, so can be extracted to any size (yellow circles) . Bottom feedarm, depending on length of side-arms and their connection place, can be fixed at any angle. If we know the position of the Focal point (red dot) of the antenna (and we know it :rolleyes: ), than it is not so difficult to place LNB in such a way that it's Phase center is co-located with antenna's Focal point. It was not my goal to make multifeed on my antenna, but I do not see any problems to put horizontal bar (green) and attach more LNB-holders. [ATTACH]78591[/ATTACH] [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
C-Band Reception, UK and Europe
C Band back on the 1.8 Channel Master
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