[time-nuts] Re: Power line: 15 second drift in one day

[Ryan Stoner]

FNET monitors time drift.

https://fnetpublic.utk.edu/time_error.html

On Fri, Jun 7, 2024, at 08:51, John Vendely via time-nuts wrote:
> As I recall, the western power grid system (WECC) discontinued line 
> frequency regulation for timekeeping purposes some time ago. The eastern 
> grid (EI) still maintains time and, here in Florida, line-operated 
> clocks typically stay within about +/- 15 seconds of my UTC clocks.
>
> 73,
>
> John K9WT
>
> On 6/7/2024 1:16 AM, Larry McDavid via time-nuts wrote:
>> The long-time, cumulative accuracy of your mains frequency seems 
>> variable by location. I've seen a cumulative error of 2 minutes here 
>> in Southern California, with local time usually being slow. For 
>> example, I last accurately set a 6-digit mains-synchronized clock on 
>> May 9, 2024; now, some 28 days later, my mains-synched clock is 01:45 
>> mm:ss slow.
>>
>> Some insist regs prohibit this. If so, the regs are being ignored.
>>
>> I have a mains-synched clock beside a GPS clock and take a photo to 
>> document the comparison.
>>
>> It is not a function of the clock. I have three kitchen appliance 
>> clocks and they all agree with the 6-digit mains-synched clock within 
>> 1 second. Yes, it is tedious to accurately (well, within one second) 
>> set appliance clocks, but doable...
>>
>> Best wishes,
>>
>> Larry McDavid W6FUB
>> Anaheim, California (SE of Los Angeles, near Disneyland)
>>
>> On 5/30/2024 12:33 AM, Hal Murray via time-nuts wrote:
>>>
>>> Last Monday was Memorial Day in the US, a big start-of-summer holiday.
>>>
>>> The power line clocks lost 15 seconds that day.
>>> Â Â  https://www.glypnod.com/TimeNuts/60Hz/60Hz-15sec-day.png
>>>
>> ...
>>> Does anybody know when they officially turned off time keeping?
>> ...
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-- 
Ryan Stoner