BBC Greenwich Time Signal inaccurate

buglawton

The DAB pips issue is potentially fixable, or at least improvable. Move the studio time and pips to an earlier moment, using the average delay across major DAB brands as a guide. Then add the delay back for FM/AM. This would bring the pips back to an accuracy of a fraction of a second on DAB.

Similar technique could be used for TV, with satellite being the most inaccurate at the moment. I'm surprised the BBC haven't already thought of this.

esuhl

50Twuncle wrote: »

So - is terrestrial TV time signal correct ?

No. Terrestrial TV is digitally encoded. The encoding and decoding processes take a significant amount of time.

unforeseen

Possible. But when you start intentionally delaying a reference time then it ceases to be a reference.
At the moment you can guarantee that the pips on FM/AM are accurate for normal use. If you start playing a out with them then they can no longer be considered a trusted source.

prosaver

esuhl wrote: »

No. Terrestrial TV is digitally encoded. The encoding and decoding processes take a significant amount of time.

i thought terrestrial tv was the old analog system then they stopped it and now we have digital free view....
freeview is delayed by 2 seconds compared to the old analog signal.

agrinnall

forgotmyname wrote: »

Thats probably old age rather than the radio

Could well be

EssexExile

prosaver wrote: »

i thought terrestrial tv was the old analog system then they stopped it and now we have digital free view....
freeview is delayed by 2 seconds compared to the old analog signal.

Terrestrial - on earth. As opposed to not on earth, like satellites.

prosaver

EssexExile wrote: »

Terrestrial - on earth. As opposed to not on earth, like satellites.

oh get it .. my mistake
like he was an extra one..

ive come to fix your satellite dish (croaky voice)

esuhl

prosaver wrote: »

oh get it .. my mistake
like he was an extra one..

"Extra" (as a prefix) means beyond or outside.

Extraterrestrial = outside/beyond Earth
Extrajudicial = outside the judicial (legal) system
Extracurricular = outside the curriculum
Extraordinary = outside the ordinary

etc.

debitcardmayhem

esuhl wrote: »

"Extra" (as a prefix) means beyond or outside.

Extraterrestrial = outside/beyond Earth
Extrajudicial = outside the judicial (legal) system
Extracurricular = outside the curriculum
Extraordinary = outside the ordinary

etc.

Of course this is an Extract of your post :beer:

Frozen_up_north

The time signals from the BBC aren't broadcast with any degree of accuracy, as others mentioned there are delays due to digital processing which make the broadcast of pips hit and miss.

Those with analogue communications receivers can listen to the one second and minute pips directly from MSF on 60 KHz and those from the Russian station RWM on 4996 and 9996 KHz, the RWM schedule is listed at:
https://en.m.wikipedia.org/wiki/RWM

The better radio controlled clocks and some mobile phones with GPS match their display exactly in synch with the ticks of MSF and RWM.