[time-nuts] 10MHz LTE-Lite - PPS accuracy?

Bob Camp kb8tq at n1k.org
Mon Dec 8 07:38:21 EST 2014


On *most* GPSDO’s, the simple answer is “there is a cable delay adjustment to align it”. Without some sort of reliable representation of UTC (at the ns level) it’s tough to measure. If you happen to live at USNO or NIST, you can access that sort of timing. For the rest of us - not so easy. The NIST two way GPS “modem” setup is about the only practical method that I know of.

The PPS out of any GPSDO will be much lower jitter than the pps from a normal GPS module. 


> On Dec 8, 2014, at 7:17 AM, David J Taylor <david-taylor at blueyonder.co.uk> wrote:
> On the 10MHz LTE-Lite, how far out from true UTC would the PPS be expected to be?
> It seems to be about 200+ ns late on my unit, although it is much more stable than a typical GPS/PPS produces.
> Thanks,
> David
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