[time-nuts] Absolute phase

Magnus Danielson magnus at rubidium.dyndns.org
Fri Nov 17 14:39:08 EST 2017


First of all, the receiver varies around some average phase.
The average of two receivers may not be the same, even if sharing antenna.
Their average can be offset from "absolute phase" because of offsets in 
the receiver, antenna cables and antenna.

If you are not to careful, a GPSDO will do nicely for many applications. 
The more you care, the more hassle.

Oh, and two GPSDOs next to each other can have significant common mode 
disturbance, so you can't really evaluate a GPSDO by measuring up to 
another GPSDO.


On 11/17/2017 08:05 PM, Jerry Hancock wrote:
> Granted I expect someone on this list to reply with something that makes me feel stupid, if you have two GPSDO units running side by side, should the phase delta on the 10Mhz output be zero (ideally)?  Is there an absolute phase standard kept between GPSDO units as all it would take is one extra inverter in the chain to flip the phase, no?
> Thanks
> Jerry
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