ChatterBank4 mins ago
how accurate is gmt
3 Answers
following on from peppy's question about z time i have noticed the gmt time signal is different on my normal radio and my dab radio also sat tv they all arrive at different times why is this and why do we still use gmt if uct (atomic time) is accurate to 1-sec every thousand years
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Best Answer
No best answer has yet been selected by mjandrews96. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.In modern practice we don't "use" GMT even if people call it by that name, but old habits die hard and because there is so little difference between GMT and UTC people tend to use the two terms interchangeably.
All digital signals received by DAB radios or satellite boxes require a finite amount of time to be coded and decoded. This is the cause of the apparent time delay when compared to terrestrial TV/Radio signals.
All digital signals received by DAB radios or satellite boxes require a finite amount of time to be coded and decoded. This is the cause of the apparent time delay when compared to terrestrial TV/Radio signals.
Time pips are no longer distributed centrally from Greenwich to every broadcaster. Many companies generate their own pips. Even then delays due to the time to travel to and from a satellite introduces a delay. (I used to watch the Proms on my television while listening to the sound on Radio 3 but they are no longer in sync because one comes by landline and the other by satellite.)
The best thing is to buy a radio clock (controlled by long wave from Rugby) which is accurate to within one second in a million years. That way you can check on all the pips (and Big Ben) and jeer when they get it wrong.
The best thing is to buy a radio clock (controlled by long wave from Rugby) which is accurate to within one second in a million years. That way you can check on all the pips (and Big Ben) and jeer when they get it wrong.
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