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Sky Digital BSkyB, Freesat & Saorsat support forum
Sky & Freesat fringe reception
Fringe reception and painted dish !
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<blockquote data-quote="horizon80" data-source="post: 487934" data-attributes="member: 279439"><p>Thank you for your replies, but I am now getting more confused, particularly about not using metallic paint (not that I was going to use it anyway!), as Paul says that there is a metallic layer below the gel coat to reflect the EM waves. So if there is why should you not use metallic paint.</p><p>My original thoughts were that this dish is a reflector, and this painted surface is as rough as a bears a**e. At satellite frequencies the wavelengh is extremely short, or small if you like, compared to the roughness of the surface, so is more likely to be reflected in a direction dictated to by the painted surface rather than the dish shape. Ok we know that EM waves can pass through thin paint, but we also know that they can be reflected of buildings or hills, and hills do not have a metallic layer just below the surface..do they?</p><p>The majority of thinking is to smooth the surface, and then use a non glossy paint or primer to finish . White has been suggested, but again someone quite rightly said that in the bright hot sun here( Spain), this could focus the light and heat in the lnb cover, and melt it. If a dish is a reflector, why not use glossy paint, as it will reflect more! ???...just use a darker colour. Hope this gets your grey cells thinking. ..Anyone out there into the design and building of dishes, and knows all the theory and practice ?</p><p>Keep it coming in !</p></blockquote><p></p>
[QUOTE="horizon80, post: 487934, member: 279439"] Thank you for your replies, but I am now getting more confused, particularly about not using metallic paint (not that I was going to use it anyway!), as Paul says that there is a metallic layer below the gel coat to reflect the EM waves. So if there is why should you not use metallic paint. My original thoughts were that this dish is a reflector, and this painted surface is as rough as a bears a**e. At satellite frequencies the wavelengh is extremely short, or small if you like, compared to the roughness of the surface, so is more likely to be reflected in a direction dictated to by the painted surface rather than the dish shape. Ok we know that EM waves can pass through thin paint, but we also know that they can be reflected of buildings or hills, and hills do not have a metallic layer just below the surface..do they? The majority of thinking is to smooth the surface, and then use a non glossy paint or primer to finish . White has been suggested, but again someone quite rightly said that in the bright hot sun here( Spain), this could focus the light and heat in the lnb cover, and melt it. If a dish is a reflector, why not use glossy paint, as it will reflect more! ???...just use a darker colour. Hope this gets your grey cells thinking. ..Anyone out there into the design and building of dishes, and knows all the theory and practice ? Keep it coming in ! [/QUOTE]
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Sky Digital BSkyB, Freesat & Saorsat support forum
Sky & Freesat fringe reception
Fringe reception and painted dish !
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