10-01-2023, 10:33 AM
They are switching to S2. They are shown as DVB-S for now as they are still in service in DVB-S. Config I believe will be 23000 3/4 DVBS2 8PSK
(10-01-2023, 10:17 AM)ASnep Wrote: Interesting that it seems that 45, 46 and 48 will stay as DVB-S for now (hence why they will only have 4 channels for now). Maybe because they first have to negotiate with Astra for a switch to DVB-S2?DVB-S2 is the modulation standard for HD, although DVB-S can he used for HD I don't think it's the done thing.
Quote:With DVB-S2 they could switch BBC Two NI and BBC One South from Skys capacity.You might be onto something there ;-)
(10-01-2023, 11:15 AM)Stooky Bill Wrote: DVB-S2 is the modulation standard for HD, although DVB-S can he used for HD I don't think it's the done thing.
I doubt they'd need to negotiate with Astra, as long as the uplink is on the right frequency, not putting out too much power and conforms to their technical standards they don't care what is done with it. For the changes to happen they'd need to know as the uplink needs to be cut and brought back up
(10-01-2023, 12:03 PM)ASnep Wrote:(10-01-2023, 11:15 AM)Stooky Bill Wrote: DVB-S2 is the modulation standard for HD, although DVB-S can he used for HD I don't think it's the done thing.
I doubt they'd need to negotiate with Astra, as long as the uplink is on the right frequency, not putting out too much power and conforms to their technical standards they don't care what is done with it. For the changes to happen they'd need to know as the uplink needs to be cut and brought back up
They may need to bother SES because on Astra2 DVB-S2 tranponders tend to be wider with a symbolrate of 23000 instead of 22000. But then again if Jimbo is right they will switch and the data in the EPG just reflects what the transponders are looking like now and not how they will look.
(10-01-2023, 12:03 PM)ASnep Wrote:Yes, they'll need to know the parameters of the uplink, but as long as the new symbol rate isn't one that takes the uplink out of the bounds of the transponder then they won't have an issue. Changing the roll-off has an effect too, making that smaller makes the carrier effectively wider.(10-01-2023, 11:15 AM)Stooky Bill Wrote: DVB-S2 is the modulation standard for HD, although DVB-S can he used for HD I don't think it's the done thing.
I doubt they'd need to negotiate with Astra, as long as the uplink is on the right frequency, not putting out too much power and conforms to their technical standards they don't care what is done with it. For the changes to happen they'd need to know as the uplink needs to be cut and brought back up
They may need to bother SES because on Astra2 DVB-S2 tranponders tend to be wider with a symbolrate of 23000 instead of 22000.
Quote: But then again if Jimbo is right they will switch and the data in the EPG just reflects what the transponders are looking like now and not how they will look.I'm not sure what you mean. The change to the transponders and the change of the EPG are two seperate processes and impossible to do instantaneously.
(10-01-2023, 12:03 PM)ASnep Wrote:(10-01-2023, 11:15 AM)Stooky Bill Wrote: DVB-S2 is the modulation standard for HD, although DVB-S can he used for HD I don't think it's the done thing.
I doubt they'd need to negotiate with Astra, as long as the uplink is on the right frequency, not putting out too much power and conforms to their technical standards they don't care what is done with it. For the changes to happen they'd need to know as the uplink needs to be cut and brought back up
They may need to bother SES because on Astra2 DVB-S2 tranponders tend to be wider with a symbolrate of 23000 instead of 22000. But then again if Jimbo is right they will switch and the data in the EPG just reflects what the transponders are looking like now and not how they will look.
(10-01-2023, 11:15 AM)Stooky Bill Wrote: Assuming the line up is still the same as the one as I have access to, you're not quite right. There'll be 5 TV services on each transponder (counting BBC3/CBBC and BBC4/Cbeebies as one service)As I understand it, South and South West will be among the first to switch. South HD is obviously already live on a Sky-hosted TP, but where will South West HD be? 10818V can't be converted until SW HD is up-and-running.
(10-01-2023, 10:17 AM)ASnep Wrote: Interesting that it seems that 45, 46 and 48 will stay as DVB-S for now (hence why they will only have 4 channels for now). Maybe because they first have to negotiate with Astra for a switch to DVB-S2?DVB-S2 is the modulation standard for HD, although DVB-S can he used for HD I don't think it's the done thing.
I doubt they'd need to negotiate with Astra, as long as the uplink is on the right frequency, not putting out too much power and conforms to their technical standards they don't care what is done with it. For the changes to happen they'd need to know as the uplink needs to be cut and brought back up
Quote:With DVB-S2 they could switch BBC Two NI and BBC One South from Skys capacity.You might be onto something there ;-)
(10-01-2023, 12:55 PM)Stooky Bil Wrote: The transponder will have to go off air to make the changes... you can't just change things like symbol rate and modulation type on the fly. Plus the data rate of the new line up has to be correct before going to air with it.
I'm not how EPG changes work - when they're done (overnight or during the day) and how long they take to react on people's boxes at home - whether a viewer tuned to a service loses it when it is being pointed elsewhere for example. But co-ordinating the two will be tricky, they will want to have the new transmissions up and running for a bit before making the EPG changes, especially where the existing HD service is moving
My guess is that all the LCNs on a transponder will be pointed away from that transponder, then the actual transmission will change. Once that's been on air for a few days the EPG changes will be made to point LCNs to that transponder.
(10-01-2023, 01:14 PM)ASnep Wrote: I know they need to take them down at least shortly.That won't happen. If you look at Jimbos list of where everything will be and compare it with where everything is now there are no regions that end up on the same transponder in HD as they are in SD (I think)
But "a couple of days of testing" would mean that people loose access to regional BBC One on satellite completely, wouldn't it? Because where do they point the LCNs of the transponder that is about to change to?
I'd think the BBC would like to avoid such a situation.