[time-nuts] M12+ Site Survey

Tim Shoppa tshoppa at gmail.com
Tue Mar 24 16:56:59 EDT 2015

Assuming pure position fix:

A foot is a nanosecond.

A mile is 5 microseconds.

30 miles is 150 microseconds.

Quite sure the GPS would declare sanity check failure if it ever saw more
than one or two satellites and saw the position fix was wrong.

Tim N3QE

On Tuesday, March 24, 2015, Martyn Smith <martyn at ptsyst.com> wrote:

> Hello,
> I apologize if this question has been asked before.
> I have a frequency standard that uses the M12+ to discipline a rubidium
> oscillator.
> I set the M12+ to do a site survey and then set it to position hold mode
> for best accuracy.
> My question is:
> If I then move the unit, for example 30 miles and leave it in position
> hold (without doing another site survey)
> How will the accuracy of the 1 pps pulse be affected?
> In this instance, I don’t actually care about alignment to UTC.
> I’m just worried about the accuracy of the 1 pps pulse and ultimately the
> accuracy of my rubidium’s frequency.
> I’m about to do some testing, but wondered if anyone had an answer already.
> Best Regards
> Martyn
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