Phil asked about "this clock", and since there is only one clock on that site 
which is a kit, I am pretty sure that we're discussing the clock built from 
this manual. Please read it before deciding how it keeps time.

http://www.tubeclock.com/manual.pdf

If there are other Nixie clock kits, please share the information on those. A 
nice gallery of built Nixie clocks is here:

http://www.electricstuff.co.uk/nixiegallery.html

wunder
K6WRU

On Dec 27, 2013, at 6:02 PM, "Lynn W. Taylor, WB6UUT" 
<[email protected]> wrote:

> There is a difference between "some" and "this."
> 
> All of the clocks here get their time via some network, or from the GPS 
> constellation.
> 
> On 12/27/2013 5:47 PM, Walter Underwood wrote:
>> According to the assembly manual, it uses the power line 60Hz as a frequency 
>> reference. Last I heard, the utilities actually manage the frequency so the 
>> long-term average is very close to 60Hz.
>> 
>> If you want real-time data on power line frequency, check out the FNET 
>> measurement network. It looks like my grid is currently at 59.990.
>> 
>> http://fnetpublic.utk.edu/
>> 
>> wunder
>> 
>> On Dec 27, 2013, at 5:38 PM, "Lynn W. Taylor, WB6UUT" 
>> <[email protected]> wrote:
>> 
>>> Some NIXIE clocks use GPS for time, which is good enough for most purposes. 
>>>  :-)
>>> 
>>> On 12/27/2013 3:57 PM, Phil Kane wrote:
>>>> Don't mean to reopen the topic, but what is the accuracy of this clock?
>> 
>> 
>> 




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