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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Dish Setup Guides, Information threads and FAQs
Antenna's focal point - "le point G"
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<blockquote data-quote="RimaNTSS" data-source="post: 924909" data-attributes="member: 312276"><p>I would like to dig out this old and not very popular thread just for reason that I think there is no user's common view on where is antenna's working area. Some (including producers and second-hand sellers) measure dimensions of their dishes from edge to edge and show those numbers, and that is because they wish to sell small product for bigger price pretending their dish is bigger. In reality, working or active area is usually smaller (like TV set, you usually measure screen diagonal, and even more- diagonal of part of screen which shows some picture). </p><p>Basically, working area of dish stops there where surface geometry (parabola) changes it's shape in such a way that microwaves reflected will not be going towards LNB. I am attaching couple of pictures with RED-dot marking point where working area of the dish starts/ends. So, to measure our dishes properly we should make such a red dots on antenna's surface to mark points A,B, C and D. And afterwards- measure vertical axis (A-<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite6" alt=":cool:" title="Cool :cool:" loading="lazy" data-shortname=":cool:" /> and horizontal axis (C-D)</p><p>[ATTACH]76981[/ATTACH] [ATTACH]76982[/ATTACH] [ATTACH]76983[/ATTACH] [ATTACH]76984[/ATTACH]</p></blockquote><p></p>
[QUOTE="RimaNTSS, post: 924909, member: 312276"] I would like to dig out this old and not very popular thread just for reason that I think there is no user's common view on where is antenna's working area. Some (including producers and second-hand sellers) measure dimensions of their dishes from edge to edge and show those numbers, and that is because they wish to sell small product for bigger price pretending their dish is bigger. In reality, working or active area is usually smaller (like TV set, you usually measure screen diagonal, and even more- diagonal of part of screen which shows some picture). Basically, working area of dish stops there where surface geometry (parabola) changes it's shape in such a way that microwaves reflected will not be going towards LNB. I am attaching couple of pictures with RED-dot marking point where working area of the dish starts/ends. So, to measure our dishes properly we should make such a red dots on antenna's surface to mark points A,B, C and D. And afterwards- measure vertical axis (A-B) and horizontal axis (C-D) [ATTACH]76981[/ATTACH] [ATTACH]76982[/ATTACH] [ATTACH]76983[/ATTACH] [ATTACH]76984[/ATTACH] [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Dish Setup Guides, Information threads and FAQs
Antenna's focal point - "le point G"
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