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Satellite TV receivers & systems support forums
Satellite Systems - What to Buy - What to install
Make Gregorian dish
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<blockquote data-quote="RimaNTSS" data-source="post: 911692" data-attributes="member: 312276"><p>I do not know how to measure illumination angle of feedhorn. I think can be only calculated, not measured. But how? Who know!</p><p>Assuming that producer of CM dishes made also matching feedhorns to them, we can state that feedhorn's illumination angle is equals to opening angle of the dish. But antenna's opening angle can be easily calculated. So, if we have 80* opening angle of antenna than it's feedhorn has 80* illumination angle. Degrees, of course, could be re-calculated to f/d ratio.</p></blockquote><p></p>
[QUOTE="RimaNTSS, post: 911692, member: 312276"] I do not know how to measure illumination angle of feedhorn. I think can be only calculated, not measured. But how? Who know! Assuming that producer of CM dishes made also matching feedhorns to them, we can state that feedhorn's illumination angle is equals to opening angle of the dish. But antenna's opening angle can be easily calculated. So, if we have 80* opening angle of antenna than it's feedhorn has 80* illumination angle. Degrees, of course, could be re-calculated to f/d ratio. [/QUOTE]
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Make Gregorian dish
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