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Message: <blockquote data-quote="Simba27" data-source="post: 62151" data-attributes="member: 182734">I accept your expert opinion but I don't understand the reasoning behind it. I'm a newbie at this and I'm trying to learn the theory rather than solve a particular problem. I have several spare dishes and don't need to buy another one. I just wondered if it was possible to gain anything and if not then why not? <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite53" alt=":confused" title="Confused    :confused" loading="lazy" data-shortname=":confused" />When I look at this filthy old dish, covered in rust and algae, I have difficulty believing that it's average surface error is even close to 0.1mm. Yet it gave a reasonable signal until I took it down a few weeks ago. I know a few people have spray painted their dishes, wouldn't that introduce surface errors of more than 0.1mm. Like I said, if I don't change the existing surface, then it will continue to reflect the same amount of signal that it always did. I don't think I can lose any signal.There are at least 5000 holes in the dish, and having looked at it again I reckon they are more like 1mm in diameter. I think the smaller diameter will make it easier to fill them accurately flush with the surrounding metal - no sanding/painting to damage the existing surface.If even one of my hole fillings was accurate within tolerance, then I should get a little bit more signal. If I could manage an average accuracy of 1mm, then 500 of those fillings would be accurate within 0.1mm. Which should equate to an extra 2.5% signal.You said that a normal sky dish is built to between 0.60 and 0.75mm accuracy. So if that's good enough for the existing surface why would my hole fillings need to be accurate to 0.1mm?If 0.75mm tolerance is acceptable and I can manage to fill the holes accurate to an average accuracy of 1mm. Then 3750 of the 5000 hole fillings will be within tolerance and the signal gain could be as much as 18%.Sorry to labour the point, but I still don't fully understand why this wouldn't work.</blockquote>

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