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

[Larry McDavid]

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.
>    https://www.glypnod.com/TimeNuts/60Hz/60Hz-15sec-day.png
> 
...
> Does anybody know when they officially turned off time keeping?
...