[time-nuts] Portable Time Standard

[jimlux]

On 1/11/19 11:57 AM, Joe Hobart wrote:
> I need a relatively lightweight, self powered, portable clock accurate to 1
> second per month.  Temperatures may range from 10 to 35 C; altitude from 1000 to
> 7000 feet.  Although expensive, some of the marine quartz chronometers appear to
> meet this requirement. ~0.3 PPM.

Any particular display or power requirements?
For instance, an inexpensive battery powered GPS would meet your 
requirement, but presumably isn't appropriate for some reason - ditto 
with any of the 60 kHz receiver based "Atomic clocks"

0.3 ppm is tighter than most inexpensive TCXOs.

> 
> Does anyone have any experience with these devices?
> 
> If so, has anyone tried to detect the probably weak magnetic field generated by
> the clock mechanism for time comparison purposes?
> 
> Thanks,
> Joe, W7LUX
> 
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