GPS Jitter versus Crystal Oscillators
Автор: Donald Pauly
Загружено: 2019-10-09
Просмотров: 194
Описание: A Tektronix TDS 3012 digital oscilloscope was used with a 10 mc external trigger from a Thunderbolt GPS. The positive transition is a 10 mc 1 V rms sine wave from a HP5061B cesium atomic clock in the free run mode. The negative transition is a 10 mc 1 V rms sine wave from a second HP5061B cesium atomic clock also in the free run mode. Horizontal is 4 ns per division and vertical is 0.2 V/div. The 1ns peak to peak jitter from the GPS 10 mc causes these 10 mc signals to move together. Their jitter is much smaller than that of the GPS. Each cesium clock in free run is essentially nothing more than an HP10811A 10 mc crystal oscillator. Note that the jitter from the GPS is about the same as the jitter produced by the VLF transmitter of WWVB on 60 kc. You will need to continually hit replay because the video is only 13 seconds long.
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