[time-nuts] Re: GPS receiver with reference clock input

[Bob Camp]

Hi

Simple answer:

Feed the 10 MHz out of your Rb (or whatever). Send the data off to NRCan (or wherever). Get
back a plot that lets you know how many parts in 10^-15 your standard is off frequency.

There are other applications. The more general answer is: to remove local clock issues from 
the solution.

Bob

> On Jun 9, 2023, at 7:37 PM, Keelan Lightfoot via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> In my pile of Trimble GPS receivers, I have a small handful of 4000SSi CORS
> receivers with a BNC clock reference input, and in the receiver firmware I
> can switch the receiver over to the external 10 MHz clock. It's all
> documented in the manual, but what I don't understand is... why?
> 
> I'm trying to reconcile my mental model of the GPS receiver, and in my
> model, any critical timing in the receiver is all relative to the received
> GPS signals, what would I gain from feeding the 10 MHz from a GPSDO other
> than the more stable OCXO in the GPSDO? I imagine it might improve jitter
> on the 1PPS signal...
> 
> Thanks,
> 
> Keelan
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