[time-nuts] How accurate are cheap radio controlled clocks?

Dr. David Kirkby david.kirkby at onetel.net
Sun Jun 26 14:22:38 UTC 2011

On 06/26/11 07:25 AM, David J Taylor wrote:
>> I've got one of the cheap radio-controlled clocks? I was listing to
>> radio 4 the other day and herd the time signal. The radio controlled
>> clock was about 3 seconds off. I was a bit surprised it was so far
>> off. I'm just wondering how accurate these things are.
> David,
> Be aware that if listening via digital radio (or worse, digital TV)
> there is a delay in the transmission chain of up to several seconds
> (DTV). I expect you know that already! Use the FM signal for best results.

I was using 198.00 kHz longwave here in the UK. Unless there's some digital 
processing going on before the signal is AM modulated, this can't explain the 

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