Long term, really low noise is all about the quality of the GPS signal and engine.
And the antenna, and the multi-path, and ionosphere, etc. ...
With a Z3801A or TBolt (or any cheap single channel GPS) receiver you should expect maybe a 5 to 10 to 15 ns variation over a 12 or 24 hour period. You should be able to see this with a 5065A or a good Cs reference.
The Z3801's GPS engine is far inferior and not even close to the 10 to 100 ps, 1 sec noise that a Tbolt engine has.
Careful, each does averaging. So to compare you have to include the time constant into the equation. The RS232 numbers the TBolt reports are heavily averaged so at 1 second they always look a lot better than they actually are. If you have hard data for your claim, I'd be interested in seeing it. /tvb _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
