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What is the accuracy (ppm) of the oscillators used in the radio boards? and What are the typical values of Carrier Frequency Offset that we should observe between boards?
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The radio reference oscillator is a Crystek CVT32-20 (datasheet), accurate to +/- 1.5ppm (or +/- 4ppm over its full calibration/temperature ranges), or around +/- 50Hz. At RF (2.45GHz is ~125 x 20MHz), this gives a carrier offset around +/- 4kHz.
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