[linux-dvb] Re: Dvb in uk

[davep <davep@cyw.uklinux.net>]

On Thursday 02 Jan 2003 16:04, Gavin Hamill wrote:

> > - the chap mentioned that he
> > has a good view of the transmitter from his window, but still can't
> > extract the digital signal as it's transmitted over a larger frequency
> > range.
>
> It's not. Each digital multiplex takes up 8MHz of spectrum - just the same
> as the analogue stuff - that's the reason the ITC website will describe
> the various muxes as being on 'channel 57' in the same way they do with
> analogue broadcasts.

The problem is that, because the digital transmissions have to coexist in the 
same part of the spectrum as the analogue ones, the frequencies chosen are 
generally in a different aerial 'group' and are sometimes widely spaced to 
avoid interfering with adjacent transmitters. For example in my area, served 
by Sandy Heath, the analogue channels are 21, 24, 27 and 31 and a group 'A' 
aerial is needed. The digital channels are 40, 42, 43, 45, 46 and *67*. That 
last one means that a wideband aerial is essential.

For more general information you might consider asking on newsgroups such as 
uk.tech.video.pvr and uk.tech.digital-tv.

Dave



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