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Retevis RT97S Repeater and RF Power Amplifier



I recently purchased a Retevis RT97S Portable Repeater through the Mygmrs.com website. After viewing products on the Retevis website I noted that they sell this repeater in a package that includes an external RF power amplifier that's installed between the repeater's output and the antenna feedline in order to increase the repeater's output wattage. Does anyone know how this configuration could possibly work? It seems to me that once the RF power amp is keyed up, it would cut off the input to the repeater / duplexer. The power amp can't possibly be passing the incoming frequency to the repeater / duplexer's antenna input while the external power amp is keyed up so the repeater's receiver would effectively be without an antenna connected during transmission. Retevis responded to me by saying they have customers who are successfully using this product combination  BUT they did not say they have tested it themselves. 


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