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What I would want would be a count that measures the zero crossing of the PPS signal and the next zero crossing of the 10 Mhz input ? This would be one number every second as the output data. Is looking at the zero crossing of the two signals OK? Simple/low cost hardware to produce this number? DIY device vs generalized Lab equipment. ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ