[time-nuts] getting accurate timing on RTL-SDR output
Mark Sims
holrum at hotmail.com
Fri Apr 13 19:57:19 EDT 2018
Note that on a lot of GPS devices that only one edge of the 1PPS pulse is stable and the other edge can jitter a bit.
Also, you might want to try programming the PPS to a 50% duty cycle (but having an asymmetrical PPS pulse might have some advantages for post processing).
The receiver with the best 1PPS stability that I have tested is the Furuno GT-8736. Its typical span is under +/- 4ns from nominal.
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