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Trak9100 GPS/Rubidium standard timing source used in many radio systems, provides timing for simulcast sites, and often supplied by Motorola Solutions Inc. with site repeater systems. Has a modular design, with two GPS receiver modules, one with Rubidium standard (the one with the fan) to compare when GPS signal may be degraded and to "calibrate" itself. Similar to Spectracom offerings and other vendors products.