[time-nuts] Portable Time Standard

[Bob kb8tq]

Hi

The most common approach to “monitor” a quartz movement is to listen to 
it at 32,768 KHz with a tuned microphone. If it is an analog movement, then 
one can detect the sound of the motor driving the mechanical side. 

Do you need a device with a visual readout or are you after something that 
gives you an electrical signal (like a PPS)?

Is DIY ok in this application? If so, there are a lot of TCXO’s out there that 
will do at least as well as what you are looking for. A very different approach 
would be a GPS (or WWVB) module with a battery attached to it. 

If a watch is “ok”, there are WWVB and GPS watches that will do much 
better than 1 second accuracy for not very insane sort of prices. 

Bob

> On Jan 11, 2019, at 2:57 PM, Joe Hobart <nova at npgcable.com> 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.
> 
> 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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