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Why does the timing accuracy vary?

timing
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Why does the timing accuracy vary?

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CDMA basestation transmissions must be synchronous with UTC to within 10 microseconds, typically much better – less than 1 microsecond. This variation is due to the possibility that a basestation might have a GPS outage, a rare occurrence. Under these conditions the basestation must stay within 10 microseconds of UTC for as long as 24 hours. This ensures the smooth operation of the CDMA telecommunications system. Our products are synchronous with the CDMA basestation transmissions from one to tens of microseconds, depending on location. This variation depends on the propagation delay from our receiver to the basestation. The propagation delay is about 5 microseconds per mile (about 3 microseconds per kilometer). In an urban environment, there are many basestations and you would probably be within a mile of one. Therefore the accuracy of the unit would be within 5 microseconds of the CDMA transmissions and typically within 6-7 microseconds of UTC. Our main facility is located in an urba

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