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Object Name Transponder
Catalog Number 2007.03.567
Description Experimental development model APX-72 diversity (Top and bottom) antenna transponder. This model combines XN-1 version's dual RF trays into a single tray (2 1/4" high) compared to standart APX-72 single antenna (1 1/8" high). Final version (XN-4?) with 1 1/8" high RF tray disappeared from AlliedSignal circa 1990.
Source Bendix Radio Foundation