Google Groups no longer supports new Usenet posts or subscriptions. Historical content remains viewable.
Dismiss

Re: DAB recievers in earshot - Audio out of sync. problem?

79 views
Skip to first unread message
Message has been deleted

Brian Gaff

unread,
Dec 27, 2013, 4:44:15 AM12/27/13
to
From what i hear, no.
Its a function of how its designed I'd imagine. It would be interesting to
know, though if two identical devices do work correctly.

I know my pure and a friends cheapo Bush are different by about 2 seconds,
mine is slower but copes with low signals better. Mine is also older and
more expensive.

I guess it depends how much of the signal is buffered.
B Brian

--
From the Sofa of Brian Gaff Reply address is active
"Charlie+" <cha...@xxx.net> wrote in message
news:lfcqb9tonhq7em9ib...@4ax.com...
> Could anyone tell me if this problem has been addressed in DAB+?
> This is because we have receivers in different rooms in the house tuned
> to the same station and this doesnt work with DAB because they decode
> out of sync. with each other. FM - no problem. ? DAB+ any better at
> this.


ne...@address.invalid

unread,
Dec 27, 2013, 5:19:53 AM12/27/13
to
On Fri, 27 Dec 2013 09:44:15 -0000, "Brian Gaff"
<Bri...@blueyonder.co.uk> wrote:

>From what i hear, no.
> Its a function of how its designed I'd imagine. It would be interesting to
>know, though if two identical devices do work correctly.
>
> I know my pure and a friends cheapo Bush are different by about 2 seconds,
>mine is slower but copes with low signals better. Mine is also older and
>more expensive.
>
> I guess it depends how much of the signal is buffered.
> B Brian

As Brian says, it's a function of how the signal decoders are designed
in each receiver. There is always a processing delay, but the extent
of the delay will depend on several factors. This will always be the
case.
Message has been deleted

ne...@address.invalid

unread,
Dec 27, 2013, 8:51:58 AM12/27/13
to
On Fri, 27 Dec 2013 10:22:25 +0000, Joe Hakeney
<j...@kinchyle.karoo.co.uk> wrote:

>
>Our two DAB sets are always in sync (Pure One in the lounge, Pure One
>Flow in the kitchen), when listening in the dining room. But always
>two seconds behind with the time signal.
>
>Joe Hakeney.
>
They both use the same decoder chip.

Dave Plowman (News)

unread,
Dec 27, 2013, 9:31:37 AM12/27/13
to
In article <5tkqb9lve15ngpudk...@4ax.com>,
Joe Hakeney <j...@kinchyle.karoo.co.uk> wrote:
> Our two DAB sets are always in sync (Pure One in the lounge, Pure One
> Flow in the kitchen), when listening in the dining room. But always
> two seconds behind with the time signal.

I'd be surprised if they were perfectly in sync. Have you tried them
beside one another?

--
*When the chips are down, the buffalo is empty*

Dave Plowman da...@davenoise.co.uk London SW
To e-mail, change noise into sound.

Bill Wright

unread,
Dec 27, 2013, 3:03:39 PM12/27/13
to
One solution would be to feed the output of a DAB radio into a small FM
transmitter, were this not illegal. Another option (my solution) is to
carry the radio station as the audio on a TV channel, assuming like us
you have tellys all over the place. At present this is a slight faff
because it means switching the telly to analogue. I have Radio 4 and
Radio Swiss Classic as the audio on two of my CCTV channels.

Bill

tony sayer

unread,
Dec 27, 2013, 3:32:00 PM12/27/13
to
In article <l9kmfc$quj$1...@speranza.aioe.org>, Bill Wright
<bi...@invalid.com> scribeth thus
An interesting combination if I might say so;!...

--
Tony Sayer


198kHz

unread,
Dec 27, 2013, 7:11:03 PM12/27/13
to
On 27/12/2013 14:31, Dave Plowman (News) wrote:
> In article <5tkqb9lve15ngpudk...@4ax.com>,
> Joe Hakeney <j...@kinchyle.karoo.co.uk> wrote:
>> Our two DAB sets are always in sync (Pure One in the lounge, Pure One
>> Flow in the kitchen), when listening in the dining room. But always
>> two seconds behind with the time signal.
>
> I'd be surprised if they were perfectly in sync. Have you tried them
> beside one another?
>
In our through lounge/dining room, one half has a Pure Legato II and the
other a Pure Sensia. They're /almost/ in sync, but it's like listening
to one radio in the bathroom.

--
198kHz
Message has been deleted

Bill Wright

unread,
Dec 28, 2013, 2:55:41 AM12/28/13
to
Charlie+ wrote:

> Bill's idea of the FM retransmitting would definitely work but if every
> household did this!!! Whadda mess... C+

Nothing compared to the mess OFCOM have organised on the UHF TV band.

Bill

Ian Jackson

unread,
Dec 28, 2013, 3:52:18 AM12/28/13
to
In message <l9m06g$md1$1...@speranza.aioe.org>, Bill Wright
<bi...@invalid.com> writes
I've got one of those FM transmitters. I've never really used it, but I
recall it seemed to work reasonably well - well enough for casual
listening on different FM radios when you're wandering around the house,
or lying in the garden on a sun lounger sipping cold beer. IIRC, it's
tuneable in 50kHz steps across the whole FM band, so you can normally
find a quiet frequency where you know you won't disturb anyone's
listening. You can (illegally) extend the range of such devices by
improving the aerial system - and I believe they have actually been used
to provide the drive for higher powered pirate transmitters. I'll see if
I can find it.
--
Ian
Message has been deleted

Bill Wright

unread,
Dec 28, 2013, 3:36:34 PM12/28/13
to
Ian Jackson wrote:

> I've got one of those FM transmitters. I've never really used it, but I
> recall it seemed to work reasonably well - well enough for casual
> listening on different FM radios when you're wandering around the house,
> or lying in the garden on a sun lounger sipping cold beer. IIRC, it's
> tuneable in 50kHz steps across the whole FM band, so you can normally
> find a quiet frequency where you know you won't disturb anyone's
> listening. You can (illegally) extend the range of such devices by
> improving the aerial system - and I believe they have actually been used
> to provide the drive for higher powered pirate transmitters. I'll see if
> I can find it.

It's surprising how far half a watt will go if you use a decent aerial,
I am told.

Bill

Jim Lesurf

unread,
Dec 29, 2013, 5:15:09 AM12/29/13
to
In article <l9ncp4$24q$2...@speranza.aioe.org>, Bill Wright
<bi...@invalid.com> wrote:
> Ian Jackson wrote:

> > I've got one of those FM transmitters.

> It's surprising how far half a watt will go if you use a decent aerial,
> I am told.

Indeed. We ran a research project for a couple of years using a 100 mW
source with a 20dB gain TX antenna over a 30km path.

I don't know the legal limit on a small TX that is in the region around
Band II. But I suspect that a very low power would do for 'around the
house'. I've wondered if using one of the bands/powers allowed for home
headphones would do the job.

That said, I find it curious that DAB set makers don't provide a simpe
user-adjustable delay to let them 'synch' reception. I guess this lack is
because.

1) Costs money.

2) Makes it easier for the consumer to choose a *different* brand for their
next set. Although that would seem short-sighted if they then buy more
later on. *Unless* they also have such an adjustment.

3) Cannae be bothered.

Jim

--
Please use the address on the audiomisc page if you wish to email me.
Electronics http://www.st-and.ac.uk/~www_pa/Scots_Guide/intro/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html

Dave Plowman (News)

unread,
Dec 29, 2013, 9:14:29 AM12/29/13
to
In article <53c1959...@audiomisc.co.uk>,
Jim Lesurf <no...@audiomisc.co.uk> wrote:
> That said, I find it curious that DAB set makers don't provide a simpe
> user-adjustable delay to let them 'synch' reception. I guess this lack is
> because.

I'm not certain any delay is exactly the same each time a receiver is
powered up.

--
*Give me ambiguity or give me something else.

Dave Plowman (News)

unread,
Dec 29, 2013, 9:21:15 AM12/29/13
to
In article <53c1959...@audiomisc.co.uk>,
Jim Lesurf <no...@audiomisc.co.uk> wrote:
> > It's surprising how far half a watt will go if you use a decent aerial,
> > I am told.

> Indeed. We ran a research project for a couple of years using a 100 mW
> source with a 20dB gain TX antenna over a 30km path.

IIRC, the old pro VHF radio mics were a nominal 30 mW. With the
transmitter pack fitted about the person and a standard receiver aerial,
they just about managed studio coverage. With a four element yagi on the
receiver and a ground plane one on the transmitter I've had a couple of
miles outdoors. Transmitter aerial a magnetic roof mount 1/4 wave on a car.

--
*What was the best thing before sliced bread? *

Bill Wright

unread,
Dec 29, 2013, 11:20:47 AM12/29/13
to
Jim Lesurf wrote:

>> It's surprising how far half a watt will go if you use a decent aerial,
>> I am told.
>
> Indeed. We ran a research project for a couple of years using a 100 mW
> source with a 20dB gain TX antenna over a 30km path.




The radio hams have low power contests, and achieve remarkable things.


> I don't know the legal limit on a small TX that is in the region around
> Band II. But I suspect that a very low power would do for 'around the
> house'. I've wondered if using one of the bands/powers allowed for home
> headphones would do the job.




Practical experience of this suggests that when very low power is used,
there are too many tiny locations around the premises where reception is
poor or non-existent because of standing wave effects. These can be
minimised by brute force; that is by turning up the power. Or you can
move the radio along the kitchen worktop a bit.

The inside of my mouth is corrugated, somewhat. I don't know why, any
more than I know why I mentioned it. Maybe it's the tea. It was very strong.

Bill

Jim Lesurf

unread,
Dec 29, 2013, 11:04:52 AM12/29/13
to
In article <53c1ab7...@davenoise.co.uk>, Dave Plowman (News)
<da...@davenoise.co.uk> wrote:
> In article <53c1959...@audiomisc.co.uk>, Jim Lesurf
> <no...@audiomisc.co.uk> wrote:
> > That said, I find it curious that DAB set makers don't provide a simpe
> > user-adjustable delay to let them 'synch' reception. I guess this lack
> > is because.

> I'm not certain any delay is exactly the same each time a receiver is
> powered up.

Dunno. Not ever checked that. I can see that the delay may vary with the
chosen bitrate, etc. But I don't why it would vary for the same bitrate and
number of channels. Is this something you've observed?

Slainte,

Dave Plowman (News)

unread,
Dec 29, 2013, 1:39:57 PM12/29/13
to
In article <53c1b59...@audiomisc.co.uk>,
Jim Lesurf <no...@audiomisc.co.uk> wrote:
> > I'm not certain any delay is exactly the same each time a receiver is
> > powered up.

> Dunno. Not ever checked that. I can see that the delay may vary with the
> chosen bitrate, etc. But I don't why it would vary for the same bitrate
> and number of channels. Is this something you've observed?

If it were possible to have an accurately fixed delay, I'd guess some
makers would implement it? Would be a selling point for many - buy X and
not have that annoying delay if two radios can be heard at the same time.
Many of my non technical pals do get annoyed by it - although perhaps more
with TV.

I don't have the problem here as I have an analogue distribution system
throughout the house. Due to very poor FM reception when I moved in. And
this in South London - not out in the sticks. ;-)

--
*ONE NICE THING ABOUT EGOTISTS: THEY DON'T TALK ABOUT OTHER PEOPLE.

Bill Wright

unread,
Dec 29, 2013, 2:03:32 PM12/29/13
to
Dave Plowman (News) wrote:

> And
> this in South London - not out in the sticks. ;-)

Off hand I can't think of a worse place to live. Definitely out in the
sticks...

Bill

Dave Plowman (News)

unread,
Dec 29, 2013, 7:19:32 PM12/29/13
to
In article <l9prmm$8m7$3...@speranza.aioe.org>,
Bill Wright <bi...@invalid.com> wrote:
> Dave Plowman (News) wrote:

> > And
> > this in South London - not out in the sticks. ;-)

> Off hand I can't think of a worse place to live.

I'm very glad of that. Can't think of a worse neighbour to have.

--
*I'm already visualizing the duct tape over your mouth

Bill Wright

unread,
Dec 29, 2013, 10:38:54 PM12/29/13
to
Dave Plowman (News) wrote:
> In article <l9prmm$8m7$3...@speranza.aioe.org>,
> Bill Wright <bi...@invalid.com> wrote:
>> Dave Plowman (News) wrote:
>
>>> And
>>> this in South London - not out in the sticks. ;-)
>
>> Off hand I can't think of a worse place to live.
>
> I'm very glad of that. Can't think of a worse neighbour to have.
>

Well you've already got plenty of dodgy people down your way. As I
understand it the place is full of gangsters and terrorists. Still, it's
your sort who are to blame for that.

Bill

Dave Plowman (News)

unread,
Dec 30, 2013, 8:00:24 AM12/30/13
to
In article <l9qpt5$86q$3...@speranza.aioe.org>,
Bill Wright <bi...@invalid.com> wrote:
> Dave Plowman (News) wrote:
> > In article <l9prmm$8m7$3...@speranza.aioe.org>,
> > Bill Wright <bi...@invalid.com> wrote:
> >> Dave Plowman (News) wrote:
> >
> >>> And
> >>> this in South London - not out in the sticks. ;-)
> >
> >> Off hand I can't think of a worse place to live.
> >
> > I'm very glad of that. Can't think of a worse neighbour to have.
> >

> Well you've already got plenty of dodgy people down your way. As I
> understand it the place is full of gangsters and terrorists. Still, it's
> your sort who are to blame for that.

But at least they're our terrorists and gangsters.

--
*Why is it that doctors call what they do "practice"?

ne...@address.invalid

unread,
Dec 30, 2013, 8:42:13 AM12/30/13
to
On Mon, 30 Dec 2013 00:19:32 +0000 (GMT), "Dave Plowman (News)"
<da...@davenoise.co.uk> wrote:

>In article <l9prmm$8m7$3...@speranza.aioe.org>,
> Bill Wright <bi...@invalid.com> wrote:
>> Dave Plowman (News) wrote:
>
>> > And
>> > this in South London - not out in the sticks. ;-)
>
>> Off hand I can't think of a worse place to live.
>
>I'm very glad of that. Can't think of a worse neighbour to have.
>
It's good to hear that you are both satisfied with your situations.
May you both live in peace and prosperity.

Dave Plowman (News)

unread,
Dec 30, 2013, 9:34:47 AM12/30/13
to
In article <vut2c99uoq22bk05f...@4ax.com>,
Thanks. I already do. If I hated so much about this country as Bill
obviously does I'd go somewhere else. I'd guess Russia has the sort of
broadcasting and immigration policies that Bill would just love.

--
*Wrinkled was not one of the things I wanted to be when I grew up

Bill Wright

unread,
Dec 30, 2013, 10:28:37 AM12/30/13
to
Dave Plowman (News) wrote:

> If I hated so much about this country as Bill
> obviously does I'd go somewhere else.

No, it's up to the foreign fuckers who are ruining this country to fuck
off somewhere else, not me.

And that, as my grandma used to add guiltily after she'd said 'damn!',
is swearing.

Bill
Message has been deleted

Mark Carver

unread,
Dec 31, 2013, 10:52:11 AM12/31/13
to
On 31/12/2013 15:14, damdu...@yahoo.co.uk wrote:

> Being fairly poor in some old market town that has been expanded and
> has nothing much of interest to do and you can not escape from would
> be my idea of a bad place to live. Andover is one place like that
> Basingstoke another but there are loads of places like them. I only
> chose them as just visiting them for work depressed me.

I live in Basingstoke, and I grew up here. It's a modern town, some
of the core buildings from its previous existence as a market town (and
railway junction) are still in evidence.

It's only depressing if you have a closed mind, and expect it to be like
York, Edinburgh, Paris, Cape Town, or Rome. It's not like any of those
places, nor does it try to be, but it has excellent amenities, and
there's plenty of places for those pesky youths to let off steam,I
rarely need to visit any other town when shopping. It's an hour from the
coast, an hour from London, 40 mins from Heathrow, 40 mins from
Southampton Docks, easy to reach any other part of the country,
especially by train. In fact because it (and Reading) are where West
Country/Welsh lines to London, cross the main Weymouth to Scotland rail
routes, you can get to most major UK cites with no more than a couple of
changes.

In better times the unemployment figures for the town were almost
at normal 'churn' levels, crime is low (even by 'Home Counties'
standards, and it lacks the hopeless bleak drug invested council estates
that are no go areas in many other towns and cites.

It's hardly paradise here, but FFS, it's a billion times better than
other urban or suburban settlements, and in less than half an hour you
can walk into the Hampshire countryside, from anywhere within the town



--
Mark
Please replace invalid and invalid with gmx and net to reply.
Message has been deleted

Mark Carver

unread,
Jan 1, 2014, 7:14:32 AM1/1/14
to
damdu...@yahoo.co.uk wrote:

> I think you are taking it personally,are you the Mayor?

Ha, no I'm certainly not the Mayor, and if it's any consolation
I button holed him once in a bar to have a rant about a local matter :-)

> But for someone without their own car who cannot afford train or bus
> fares the travel opportunities mean bugger all .Sure some can and do
> walk half an hour to the countryside but if you happen to want to do
> something else then the opportunities are far less than what the same
> half hour walk could provide to an open minded person in large parts
> of London especially if it is an older person with a bus
> pass.Basingstoke and other provincial towns just cannot offer the same
> opportunities.

No, I grant you that, that's very true, public transport for local
journeys within Greater London is head and shoulders above anything in the
rest of the UK in my experience.
If I lived and worked in London, I probably wouldn't bother owning a car,
just hire one as when required for hols etc


> What I'm really getting at is that if I were poor I would rather live
> either in London or where I live now right in the countryside in a
> Hampshire village. Living on estate in extended suburbia seems to be
> the worst option though naturally millions do and are happy to do it.
> A lot of my work was in premises where those trapped by being out of
> work/thick/ ill health tended to pass the time and their misery has
> coloured my view of such places. People like yourself were out and
> away working.

Noted

> If it's any consolation I'm always recommending people
> visit the excellent Milestones museum

Yes, it is good, I must revisit, haven't been for a while

http://www3.hants.gov.uk/milestones/

> and spent many weekends in the
> late 70's trying to get your canal working again.

Ah, very good, and some stretches of that between here and Woking make for
a pleasant walk.

Paul Ratcliffe

unread,
Jan 1, 2014, 8:24:42 AM1/1/14
to
On Wed, 01 Jan 2014 12:14:32 +0000, Mark Carver
<mark....@invalid.invalid> wrote:

> Ha, no I'm certainly not the Mayor, and if it's any consolation
> I button holed him once in a bar to have a rant about a local matter :-)

Did he take any notice and/or do anything about it?

Mark Carver

unread,
Jan 1, 2014, 9:06:17 AM1/1/14
to
No, of course not, he's a politician.

Dave Plowman (News)

unread,
Jan 2, 2014, 8:06:28 AM1/2/14
to
In article <biif58...@mid.individual.net>,
Mark Carver <mark....@invalid.invalid> wrote:
> No, I grant you that, that's very true, public transport for local
> journeys within Greater London is head and shoulders above anything in
> the rest of the UK in my experience. If I lived and worked in London, I
> probably wouldn't bother owning a car, just hire one as when required
> for hols etc

Many say this - but few actually put it into practice. I have neighbours
on both sides who go to work by PT - but both have two (his and hers)
expensive cars. Which may not even move from one week to the next.

--
*I didn't like my beard at first. Then it grew on me.*
0 new messages