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Have 3 of these distributed by Spectrum International in Concord, Ma. Says Microwave modules Liverpool England. Has connections for 432 mhz output, 432 mhz input, power T/R E +12v, 28 mhz output and 28 mhz input. No other markings or serial numbers. All look to be in good shape. I believe these are used for satilite work? How much are they worth?

Thanks