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

[John Vendely]

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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