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<blockquote data-quote="Simba27" data-source="post: 61961" data-attributes="member: 182734">OK. I think I understand what you are saying.If every point on the surface of the dish is slightly wrong by an average of 1mm, then I lose 3% signal. Is that right?<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite53" alt=":confused" title="Confused&nbsp; &nbsp; :confused" loading="lazy" data-shortname=":confused" />On that basis, I think that it would be avantageous to clean off the rust, flaking paint and bird crap for a start. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin&nbsp; &nbsp; :D" loading="lazy" data-shortname=":D" />Suppose that I am not altering the existing surface, just adding extra surface by filling in the holes. I don't see how I could get less signal by doing that. I gain a theoretical 25% but then I am going to lose some of that due to errors in the added surface. To lose 100% of that extra signal, the average error in the extra surface would have to be 33mm. Given that the holes are only about 2.5mm in diameter, surely an average error of &lt;33mm should be achievable?Let's suppose that the average error of the extra surface is 3mm. That's 9% of the 25% improvement lost - which results in a net gain of over 22% on the original unaltered dish.As BGonaSTICK said, maybe I'll get 15-20% improvement.Or have I misunderstood?Phil.</blockquote>

[QUOTE="Simba27, post: 61961, member: 182734"] OK. I think I understand what you are saying. If every point on the surface of the dish is slightly wrong by an average of 1mm, then I lose 3% signal. Is that right?:confused: On that basis, I think that it would be avantageous to clean off the rust, flaking paint and bird crap for a start. :D Suppose that I am not altering the existing surface, just adding extra surface by filling in the holes. I don't see how I could get less signal by doing that. I gain a theoretical 25% but then I am going to lose some of that due to errors in the added surface. To lose 100% of that extra signal, the average error in the extra surface would have to be 33mm. Given that the holes are only about 2.5mm in diameter, surely an average error of <33mm should be achievable? Let's suppose that the average error of the extra surface is 3mm. That's 9% of the 25% improvement lost - which results in a net gain of over 22% on the original unaltered dish. As BGonaSTICK said, maybe I'll get 15-20% improvement. Or have I misunderstood? Phil. [/QUOTE]

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