Archived and Closed
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Could someone from Exede, or some oddly intelligent genius, tell me the difference between Ku and Ka reflectors, parabolic reflectors, etc? I've been thinking about this, looking about at all of the old abandoned dish's on my family farm. From my experience in the telecom industry, and dealing with a lot of RF-based systems, I know that there are 2 important principles. 1) relative "permeability" of the reflective surface, and 2) the relationship between the LNB location and the reflector's center of focus. Apart from that, ruling out dish diameter due to the required gain, Ku and Ka dish assemblies should be relatively interchangeable, assuming the geometry is correct. The ONLY think I can think of is surface treatment, like maybe a Ka reflector has a special coating, designed to reflect 20-30 GHz RF. Otherwise, I don't see how there would be anything different. I'm not questioning the necessity to have a correct tria/LNB, correctly positioned...I'm simply asking why a 1.2M dish, made of some polymer, can't reflect Ka, when it does a great job of reflecting Ku. Anyone? I need some sleep, and this is keeping me up. Whether or not I need a different hobby is debatable.