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<blockquote data-quote="Old Satellite" data-source="post: 61465" data-attributes="member: 175277">OK nice discussion - for those that enjoy the real understanding of the loss due to inaccuracies in the either the size or the deformity of the surface there are some simple calculations.Any one still want to continue to follow ? no thought not so here are some general help linesRMS based (Root Mean Square) deviation- normal method of measurement for an average surface irregularities. KU band frequencies 10-12 GHZAn error of 10mm within a surface area of a dish in a random aspect through the surface area of the dish surface would result an loss of signal equal to approx 30 %An error of 1mm within a surface area of a dish in a random aspect through the surface area of the dish surface would result an loss of signal equal to approx 3 %Normally the professional dishes will be made to approx 0.15- 0.40mm resulting a loss of less than 1 % signal from surface irregularities.a normal pressed Astra / Sky mini mesh dish will be normally be around the 0.60-0.75mm area.So in short if you want to see some improvements then make sure your foil etc is better than 0.5mm otherwise I would no bother.And by the way if you bend the dish out of shape with the extra work then most likely the extra bends will make it worse.Anyway dishes are cheapso good look and have some funregardsOld Satellite</blockquote>

[QUOTE="Old Satellite, post: 61465, member: 175277"] OK nice discussion - for those that enjoy the real understanding of the loss due to inaccuracies in the either the size or the deformity of the surface there are some simple calculations. Any one still want to continue to follow ? no thought not so here are some general help lines RMS based (Root Mean Square) deviation- normal method of measurement for an average surface irregularities. KU band frequencies 10-12 GHZ An error of 10mm within a surface area of a dish in a random aspect through the surface area of the dish surface would result an loss of signal equal to approx 30 % An error of 1mm within a surface area of a dish in a random aspect through the surface area of the dish surface would result an loss of signal equal to approx 3 % Normally the professional dishes will be made to approx 0.15- 0.40mm resulting a loss of less than 1 % signal from surface irregularities. a normal pressed Astra / Sky mini mesh dish will be normally be around the 0.60-0.75mm area. So in short if you want to see some improvements then make sure your foil etc is better than 0.5mm otherwise I would no bother. And by the way if you bend the dish out of shape with the extra work then most likely the extra bends will make it worse. Anyway dishes are cheap so good look and have some fun regards Old Satellite [/QUOTE]

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