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Both constructions use the same type of material, basically a thermoset FRP (fiberglass reinforced plastic), which includes specially formulated resins, flame retardants compositeresins and UV stabilizers to produce the compositeresins unique benefits which characterize fiberglass reflectors. Because some antenna installations must exist in environments containing many corrosive agents, the materials in the construction of the antenna must be carefully selected to alleviate corrosion problems. Obviously, in the case of an aluminum structure, dissimilar metal contact compositeresins is always a risk factor. A fiberglass dish, on the other hand, all but eliminates this problem - for obvious reasons. The resins used in antennas have been subjected to both field and laboratory tests involving over 130 highly corrosive chemicals at temperatures up to at least 120° F (50° C), with results that indicated little or no detectable degradation of the test samples.
Remember that all parabolic antennas, regardless of the material used, must first and foremost, provide a precision reflecting surface. There are two types of fiberglass reflectors, each using a completely different construction technique. At present, these types can be classified according to compositeresins application, although in the future compositeresins we may elect to use a single technique for all applications. Currently, antennas used for terrestrial communications, i.e., compositeresins point-to-point microwave, are of a one-piece construction, that is, they are formed as a single unit on a mold the same size as the finished reflector. Satellite Earth Station Antennas, on the other hand, are of a segmented construction, the segments being high-pressure compression molded. Because ESA''s can be shipped in segments, they offer significant savings for the customer in freight costs and are particularly easy to handle on site, reducing overall installation costs.
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