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Thursday 20 September 2012, 16:00
This fantastic picture (courtesy of SES) shows satellite Astra 1N during testing. As you may recall, we moved many of our services on satellite over to Astra 1N earlier this year. I thought I'd share it with you as I have some news to tell you about a forthcoming change to the transponder on Astra 1N that carries BBC One HD and BBC HD.
During the summer last year we made a significant change to our HD transponder, upgrading the transmission mode of the BBC's signal from "DVB-S" to "DVB-S2".
This change meant that we were able to make more efficient use of the valuable satellite capacity available on our HD transponder. It gave us the ability to broadcast at 1920 resolution and conduct 3D trials on satellite for Wimbledon, Strictly Come Dancing, Street Dance, the London 2012 Olympic Games and, most recently, Planet Dinosaur.
Over the last year, we have worked closely with our colleagues at Sky, Freesat and SES to investigate how we can continue to make the most efficient use of our satellite capacity in light of improving technology. As a result, we are now able to make a further modification to the DVB-S2 operating parameters which enables us to access additional capacity. This will support the forthcoming launch of BBC One HD for Scotland, Wales and Northern Ireland.
We will be making this change during the early hours of 27 September 2012 and will update our reception advice page which details all our satellite tuning details at that time.
The change will mean different things to different people:
|Frequency||10,847 MHz (vertical polarity)||unchanged|
|Modulation||DVB-S2, QPSK||DVB-S2, 8PSK|
|Symbol Rate||23.0 MSymb/s||unchanged|
We have also contacted satellite and aerial installer trade associations - dthe CAI and the RDI - providing them with information with which to brief their members in case anyone experiencing a problem contacts an installer rather than their platform operator. We will also be putting information about this change on the satellite BBC Red Button page 998 a bit nearer the time because we know not everyone has access to the internet.
If you watch our HD services on satellite, I hope this change won't cause you any worry.
Alix Pryde is Director, BBC Distribution
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