Just to liven thing up a bit here
- From: Richard Evans <rp.evans.nospam@xxxxxxxxxxxxx>
- Date: Sun, 14 Aug 2011 21:16:25 +0100
Not sure I can be bothered to log into Jame's blog to point out where he has gone wrong. However a few points.
1: He says
DVB-T2 is television, broadcast in UHF, and wholly unsuited for mobile reception. (Remember trying one of those pocket TVs when they were all the rage in the 1980s? There’s a reason why we use rooftop antennas in this country).
Now obviously there is a trade off between capacity and robustness, and since the TV broadcasts were never intended for mobile reception they would have chosen to provide higher capacity rather than making the robust enough for mobile reception. This does not mean that DVB can not be made suitable for mobile reception.
Then of course there is the greatly improved error correction with T2. Its used in the HDTV multiplexes to provide higher capacity, but does not have to be used this way. It can also be used to make the signal far more robust.
Now I'm not saying that UHF is the ideal band for mobile broadcasting, but it's not nearly so bad when using T2.
2: Then of course he goes on to say how there is already a system based upon Eureka 147, but of course doesn't mention that broadcasting using this out dated system is expensive.
Now moving away slightly from the subject of this Blog, I still don't see why they can use T2-Lite in some of the unused DAB channels in Band III. T2 has a 1.7Mhz bandwidth option, that I assume was designed for this purpose. I accept that the there might be a short term issue with lack of chipsets, but in the short term, couldn't they use digital TV chipsets for in car devices. They may be more power hungry than chipsets designed for T2-Lite, but that is less of a problem when you have a car battery to run them. Once there a broadcasts available, it probabaly would be too many years before they start developing chipsets specifically designed for the job. We would then be able to have portable and hand held devices, using a modern efficient broadcasting system, which can provide good capacity, and hence plenty of content, with robust reception and without the high broadcasting costs of Eureka 147.