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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Satellite Meters and Installation Equipment
How to calculate depth of satellite dish?
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<blockquote data-quote="RimaNTSS" data-source="post: 1075876" data-attributes="member: 312276"><p>There are no feedhorns for 130cm dish. Main parameter of the feedhorn is it's illumination angle. In ideal situation illumination angle of the feedhorn should be equal to antenna's opening angle. So, first you should know what was your antenna opening angle. Do you know the opening angle of your antenna before modification and after modification? I think it could changed for some degrees, for example 10*. Therefore I would say that changing of feedhorn (if you manage to find or make one) will not change a lot. The main obstacle why you can not get considerable increase of performance of your system is the fact that it is impossible to make perfect extention boards. It is also nerly impossible to attach those boards to the antenna. So, IMHO, I would say that it almost does not matter what kind of feedhorn will you use you will never get much better performance of the system. At least till you get extension boards perfectly curved and attached to antenna.... but that is impossible, IMHO again. Do not forget, it is Ku-band and any unprecision of shape of antenna > than 1mm is no go.</p><p>BTW, I did not see any pictures of your enlarged antenna. Did you show some?</p><p></p><p>Added later: [USER=212306]@italy2006[/USER] from your PDF picture I see that you wish to make extension only upwards. So I have couple of questions to you:</p><p>- Are you willing to change not only working area of the dish but also it's offset angle?</p><p>- Where do you point your LNB? Could you show that point on your PDF drawing?</p></blockquote><p></p>
[QUOTE="RimaNTSS, post: 1075876, member: 312276"] There are no feedhorns for 130cm dish. Main parameter of the feedhorn is it's illumination angle. In ideal situation illumination angle of the feedhorn should be equal to antenna's opening angle. So, first you should know what was your antenna opening angle. Do you know the opening angle of your antenna before modification and after modification? I think it could changed for some degrees, for example 10*. Therefore I would say that changing of feedhorn (if you manage to find or make one) will not change a lot. The main obstacle why you can not get considerable increase of performance of your system is the fact that it is impossible to make perfect extention boards. It is also nerly impossible to attach those boards to the antenna. So, IMHO, I would say that it almost does not matter what kind of feedhorn will you use you will never get much better performance of the system. At least till you get extension boards perfectly curved and attached to antenna.... but that is impossible, IMHO again. Do not forget, it is Ku-band and any unprecision of shape of antenna > than 1mm is no go. BTW, I did not see any pictures of your enlarged antenna. Did you show some? Added later: [USER=212306]@italy2006[/USER] from your PDF picture I see that you wish to make extension only upwards. So I have couple of questions to you: - Are you willing to change not only working area of the dish but also it's offset angle? - Where do you point your LNB? Could you show that point on your PDF drawing? [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Satellite Meters and Installation Equipment
How to calculate depth of satellite dish?
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