Abstract: An improved receiver/timing apparatus is disclosed for use in a single frequency, time-shared, continuous wave, phase-comparison positioning system wherein a trigger signal is transmitted from a master station and wherein pattern frequency signals are transmitted from the master and a plurality of slave stations. The improved receiver/timing apparatus comprises a trigger processor and a timing generator. After acceptable good trigger transmissions have been received for a predetermined number of successive trigger intervals, subsequent trigger transmissions from the master transmitting station are sampled only during a precise interval which is dictated by a timing generator. Also, the timing generator is "locked in" at that time, and spurious electrical transmissions can not reinitialize the timing generator and proper phase comparison is, therefore, maintained.