DAB for Cars?

Oh dear! DAB doesn't seem to get much support among the motoring classes
either....

http://www.autoexpress.co.uk/car-new...rce=newsletter

Go all the way down to the Discussion.

"UK Traveller" wrote in message
...
Oh dear! DAB doesn't seem to get much support among the motoring classes
either....

http://www.autoexpress.co.uk/car-new...rce=newsletter

Go all the way down to the Discussion.

My new Volvo has DAB and FM. I used both on a trip from Edinburgh to
Suffolk - no real difference but DAB gave me extra stations like BBC Radio
7. Indoors, I still need FM as Radio 3 on DAB is poor compared to FM.

UK Traveller wrote...

DAB doesn't seem to get much support among the motoring classes
either....

Clods who post about radio in a TV group are not flavour of the month
either.


Go all the way down to the Discussion.

If you can't even be arsed to attempt to start a discussion on the
topic you posted a link to, why should we bother to follow it?

--
UnsteadyKen

"Geoff Pearson" wrote in message
...
My new Volvo has DAB and FM. I used both on a trip from Edinburgh to
Suffolk - no real difference but DAB gave me extra stations like BBC Radio
7. Indoors, I still need FM as Radio 3 on DAB is poor compared to FM.

How well does DAB on the move adjust to changing from one transmitter to
another as you move around the country? Can you hear an audible glitch or is
it a seamless transition?

I remember some early FM radios with RDS used to mute for a fraction of a
second as they switched from one signal to another but more recent ones seem
to be immune to any momentary switchover glitch.

I imagine that if DAB is transmitted in labelled packets of data which use
the same ID numbering across all transmitters then it should be seamless
providing the radio buffers a few packets between receipt and playout: it
can switch over from packet 123 from transmitter A to packet 124 from
transmitter B, though it could equally well switch over a few packets early
or later of that, because packet n from one transmitter should be identical
data to packet n from all other transmitters.

As a matter of interest, should DAB be immune to stray interference from PCs
and other similar equipment in the home? My mother's DAB radio seems to work
flawlessly until she switches on her PC (*) which is next to it, when
reception becomes much more sensitive to people walking near the PC and to
the precise location of the radio. And, yes, I've confirmed that it is the
switching on of the PC rather than its monitor which is causing it!


(*) A desktop in an earthed metal case, not a laptop in an unearthed plastic
case.

NY wrote:
"Geoff Pearson" wrote in message
...
My new Volvo has DAB and FM. I used both on a trip from Edinburgh to
Suffolk - no real difference but DAB gave me extra stations like BBC
Radio 7. Indoors, I still need FM as Radio 3 on DAB is poor compared
to FM.

How well does DAB on the move adjust to changing from one transmitter to
another as you move around the country? Can you hear an audible glitch
or is it a seamless transition?

Seamless, all DAB transmitters for a given mux operate as an SFN (Single
Frequency Network)* so there is no freq hopping (as you get with FM-RDS)
That's why DAB is largely immune to multipath, it actually thrives on it,
so in a given location you could well be receiving the signal from several
transmissions and/or reflected signals from different directions

As a matter of interest, should DAB be immune to stray interference from
PCs and other similar equipment in the home? My mother's DAB radio seems
to work flawlessly until she switches on her PC (*) which is next to it,
when reception becomes much more sensitive to people walking near the PC
and to the precise location of the radio. And, yes, I've confirmed that
it is the switching on of the PC rather than its monitor which is
causing it!

Yes, it's still an RF carrier you're trying to receive, so it can be destroyed
by the sort of RF gunk that emanates from PCs etc

* One exception, the Digital One commercial national mux, one freq in
Eng/Wales/NI (11D) and another for Scotland (12A) been like that since
launch 18 years ago, foresight perhaps !!

http://www.wohnort.org/DAB/uknat.html

--
Mark
Please replace invalid and invalid with gmx and net to reply.

"UnsteadyKen" wrote in message ...

UK Traveller wrote...

DAB doesn't seem to get much support among the motoring classes
either....

Clods who post about radio in a TV group are not flavour of the month
either.


[snip]

Actually it is relevant Ken as the technology used to transmit DAB is identical to that used for DTTV except it has fewer carriers and consequential lower data rate.


--
Woody

harrogate three at ntlworld dot com

"Mark Carver" wrote in message
...
NY wrote:
How well does DAB on the move adjust to changing from one transmitter to
another as you move around the country? Can you hear an audible glitch or
is it a seamless transition?

Seamless, all DAB transmitters for a given mux operate as an SFN (Single
Frequency Network)* so there is no freq hopping (as you get with FM-RDS)

Ah, I didn't know that the muxes were each transmitted as an SFN. Problem
solved, then!


As a matter of interest, should DAB be immune to stray interference from
PCs and other similar equipment in the home?

Yes, it's still an RF carrier you're trying to receive, so it can be
destroyed by the sort of RF gunk that emanates from PCs etc

But is it likely that a DAB radio would be more or less susceptible than an
FM radio? http://en.wikipedia.org/wiki/Digital...United_Kingdom
says that DAB in the UK uses frequencies of around 200 MHz, roughly twice
that of FM. Is 200 MHz more or less likely to suffer interference from a PC
than 100 MHz, for CPU clock speeds of a few GHz? Obviously there's the type
of modulation and error-correction to be considered as well!

On Tue, 17 Dec 2013 17:46:07 -0000, Woody wrote:

This is a multi-part message in MIME format.

Can you get a ****ing clue?

NY wrote:

http://en.wikipedia.org/wiki/Digital...United_Kingdom says
that DAB in the UK uses frequencies of around 200 MHz, roughly twice
that of FM. Is 200 MHz more or less likely to suffer interference from a
PC than 100 MHz, for CPU clock speeds of a few GHz? Obviously there's
the type of modulation and error-correction to be considered as well!

All I can say is that the emissions from the LCD screens I use are about
15dB stronger on the FM band than on the DAB band.

Bill

"UnsteadyKen" wrote in message
...

UK Traveller wrote...

DAB doesn't seem to get much support among the motoring classes
either....

Clods who post about radio in a TV group are not flavour of the month
either.

DAB is a TV system too, they've been doing it since 2006:
http://www.theregister.co.uk/2006/09..._broadcast_tv/

Also, DAB uses TV channels, namely the 7 MHz channels of the long
established European System B, divided into quarters. So BBC National DAB
Block 12B for example, is actually the second quarter of TV Channel E12.