[time-nuts] 1pps signal presence with no GPS signal.

Chuck Harris cfharris at erols.com
Thu Jul 7 10:46:50 EDT 2005

David Kirkby wrote:
> Javier wrote:
>> Hello,
>> The 1pps signal on a M12+ is switchable. It can be selected to be on 
>> all time or on only when tracking at least one satellite.
>> Regards,
>> Javier, EA1CRB
> Is turning off the 1pps, the best thing to do if controlling a crystal 
> or rubidium? It seems most logical to me, so I can't understand why the 
> default is to not to.
> David Kirkby

I suppose they leave it on because if they turned it off, your GPS disciplined
wall clock would stop.  If they leave it on, the wall clock would drift off time
by a few fractions of a second, and then be corrected when the signal returns
some short time later.

Just a guess,


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