Something I've noticed regarding on the "syncing" issue during NC and WN overnight simulcasts - When programmes being simulcasted are not produced locally from Broadcasting House's gallery (e.g Sport Today from Salford studio's gallery, Asia Business Report from Singapore studio's gallery), NC's feed seems to be a second "off" when compared to WN's feed.
Take the following NC and WN simulcast extract I've recorded as an example(Yes I know I'm a weirdo I watch BBC News on both channels in late nights...):
On Newsday (00:00 in video) and the bottom-of-the-hour headlines (01:29 in the video) where it's produced by Studio C's gallery in Broadcasting House, both NC and WN's output seems completely in sync, judging by the audio that there's not much "echo". (Oops let's never mind WN accidentally cutting into NC's domestic headlines while joining ABR!)
However, on Asia Business Report (02:46 in video) where it's produced by Singapore's studio gallery, it's significant that NC's output is out of sync with WN's output by 0.5 - 1 second. This can be noticed when listening to Rico Hizon's voice and observing the lower thirds pop ups.
On Sport Today (07:22 in video) where it's produced by Salford's studio gallery, the out of sync issue is more significant, when listening to Nick Marshall's voice.
Is this something about satallite and terrestrial delays, where satallite transmissions are faster than terrestrial transmissions, or is it something about the acquisition of feeds? (I assume RedBee Media is taking the Asia Business Report and Sport Today feeds directly from their respective galleries, while NC's Studio C is relaying RedBee Media's feed, which causes NC's output being a little bit "later" than WN....
The curiousity is driving me crazy! I hope some insiders can clear my mind up!
(Btw apologies to the admins that I posted a similar post on a wrong thread recently