[time-nuts] need recomendation for a portable 10mhz reference oscilator

bg bg at lysator.liu.se
Wed Dec 12 00:58:15 EST 2007


On Tue, 2007-12-11 at 18:38 -0500, John Ackermann N8UR wrote:

> To get decent (for some definition of "decent") timing, you need to
> operate the receiver in "0-D" mode, telling it where it is and letting
> it solve just for time.  I haven't done the experiments myself but I
> believe that the time accuracy is pretty dramatically degraded when
> operating in 2-D or 3-D mode.
> 
> > How long does a survey take (in good conditions) and what sort of time 
> > constant would you want to use with a navigation box?
> 
> It depends on the receiver, but usually it's a few hours to a full day.
>  Of course, if you use external software you can use whatever time
> period you want.
> 
> John

I am surprised surveying mode is needed anymore. In a SA environment it
makes sense, but for me its hard to understand with the current accuracy
given by the GPS system.

--

   Björn




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