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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Adapting an astra/hotbird monoblock to a 100 cm dish
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<blockquote data-quote="a33" data-source="post: 1160056" data-attributes="member: 332642"><p>4°monoblock, 6°monoblock, that is all relative to the width of the dish, and f/D ratio (equivalent). These latter values are often not mentioned.</p><p>A 4°monoblock on a 60cm dish would function as a 6°monoblock on a 40 cm dish (with equal f/D-ratio(equivalent)).</p><p>So what kind of 4°monoblock do you mean?</p><p>And how would you "adjust" something, on a monoblock? Apart from what Lazarus wrote? (The "spread" can easily be made wider, but hardly smaller...)</p><p></p><p></p><p>The crucial factor of a monoblock is the distance between the phase centers of both feedhorns of the monoblock. Or, the same value: the distance between the center of the two 'tubes' of the monoblock. </p><p>That distance must match the angular distance between the two satellites from your location, and the effective focal length of your dish. Accounting for Beam Deviation Factor, of course.</p><p></p><p>Multifeed skew can be calculated; I've a pretty exact calculator nowadays.</p><p></p><p>Greetz,</p><p>A33</p></blockquote><p></p>
[QUOTE="a33, post: 1160056, member: 332642"] 4°monoblock, 6°monoblock, that is all relative to the width of the dish, and f/D ratio (equivalent). These latter values are often not mentioned. A 4°monoblock on a 60cm dish would function as a 6°monoblock on a 40 cm dish (with equal f/D-ratio(equivalent)). So what kind of 4°monoblock do you mean? And how would you "adjust" something, on a monoblock? Apart from what Lazarus wrote? (The "spread" can easily be made wider, but hardly smaller...) The crucial factor of a monoblock is the distance between the phase centers of both feedhorns of the monoblock. Or, the same value: the distance between the center of the two 'tubes' of the monoblock. That distance must match the angular distance between the two satellites from your location, and the effective focal length of your dish. Accounting for Beam Deviation Factor, of course. Multifeed skew can be calculated; I've a pretty exact calculator nowadays. Greetz, A33 [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Adapting an astra/hotbird monoblock to a 100 cm dish
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