Continuation from cog31s GPS issue.


Author Message
Volhout
Guru

Joined: 05/03/2018
Location: Netherlands
Posts: 5991
Posted: 10:22am 08 Oct 2019      

In other words: build a software PLL. That is also how calibration of Rubidium frequency references works. The average GPS signal over 24 hours and adjust the Rubidium tuning according. Then you get within 1ppm accuracy.

Volhout

P.S. 1 mSec accurate relay operation may need compensation, since mechanical relays take 3-20mSec to switch the contact, only reed relays are faster. You can do this by measuring the exact opening time and closing time of the contact (in the actual circuit) and compensating for it.
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