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Amongst the building blocks of a GPS Time and Frequency solution the oscillator is a key component<ref>http://www.swpc.noaa.gov/sww/SWW_2011_Presentations/Wed_830/GPS-PNTTimingStudy-SpaceWeather4-27.pptx</ref>
Usually built around
How a GPSDO works<ref>http://tf.nist.gov/sim/2010_Seminar/SIM_2010_GPS_Lombardi.ppt</ref>
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