[time-nuts] Periods in GPS systems.

Bob Camp kb8tq at n1k.org
Tue Oct 21 20:31:03 EDT 2014


They sound like update rates on the filter in your GPSDO.


> On Oct 21, 2014, at 6:10 PM, dan at irtelemetrics.com wrote:
> Hi All,
> I've been playing with a GPSDO a little here. In order to get a handle on the response time of the loop, I ran an FFT on the EFC DAC value over a long run. What was interesting, was that three frequencies popped up with minor peaks. They were cycles that equaled 512 seconds, 682 seconds, and 1024 seconds. 
> Is anyone aware of any periods like this in the GPS system? These seem rather conspicuous!
> Dan
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