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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