DAB aerial
 

Don Pearce wrote:

Most of the time yes, but I've studied an awful lot of anomalous
propagation over the years and particularly around sunset it is not
unusual to get signals coming through from much further at high
strength for a few seconds.

Yes, my radio has been unable to decode the BBC and D1 muxes for spells during
severe 'lift' conditions. The metering menus showed 100% signal, but 0%
quality, normally it's 100/100. I remember one day in August 2003, DAB was
unusable, as was FM, as as DTT, the only stable reception was D-Sat, (and AM :-) )

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

DAB aerial
 

In article , Mark Carver
scribeth thus
Don Pearce wrote:

Most of the time yes, but I've studied an awful lot of anomalous
propagation over the years and particularly around sunset it is not
unusual to get signals coming through from much further at high
strength for a few seconds.

Yes, my radio has been unable to decode the BBC and D1 muxes for spells during
severe 'lift' conditions. The metering menus showed 100% signal, but 0%
quality, normally it's 100/100. I remember one day in August 2003, DAB was
unusable, as was FM, as as DTT, the only stable reception was D-Sat, (and AM :-)
)


But they promised us perfect reception free from crackles and hiss and
fading!.

And their was this CD quality issue;)...
--
Tony Sayer

DAB aerial
 

On Thu, 24 Jan 2008 07:21:21 +0000, Mark Carver
wrote:

Don Pearce wrote:

Most of the time yes, but I've studied an awful lot of anomalous
propagation over the years and particularly around sunset it is not
unusual to get signals coming through from much further at high
strength for a few seconds.

Yes, my radio has been unable to decode the BBC and D1 muxes for spells during
severe 'lift' conditions. The metering menus showed 100% signal, but 0%
quality, normally it's 100/100. I remember one day in August 2003, DAB was
unusable, as was FM, as as DTT, the only stable reception was D-Sat, (and AM :-) )

Spot on! The satellite signals come down at such a steep angle that
they don't get trapped in the atmospheric waveguide ducts that form.
And AM wavelengths are just too big to fit. It is just the daily rise
and fall of the ionosphere that dictates how far that goes.

d

--
Pearce Consulting
http://www.pearce.uk.com

DAB aerial
 

the distance you refer to is 56 km.....

"Don Pearce" wrote in message
...
On Wed, 23 Jan 2008 23:26:22 +0000 (GMT), "Dave Plowman (News)"
wrote:

In article ,
Andy Burns wrote:
I've always used my vertical Band II (aka FM band) dipole
for DAB, it works very well, pulling in distant muxes from miles away.

If you pull in distant (i.e. over 46 miles) signals won't that harm the
BBC SFN signal from your local TX? also you'll just get "n" copies of
Gold/Chill/Galaxy/Heart/Traffic/XFM

IIRC, it's a feature of DAB that receiving a second signal from a
different transmitter can be a benefit as it adds to the original -
rather causing multipath problems as with FM.

Up to a point. There is a guard interval that allows multipath signals
up to a certain amount of delay (hence distance). I can't remember
what that distance is, but I know it is less than it would have been
if they hadn't gone for the "available now" option, but waited for the
chip sets that permitted more, slower carriers.

d

--
Pearce Consulting
http://www.pearce.uk.com

DAB aerial
 

tony sayer wrote:

But they promised us perfect reception free from crackles and hiss and
fading!.

And their was this CD quality issue;)...

LOL!

I've heard that 128k was the bare minimum, according to ofcom, and that
in no account should anyone use less. (anyone got the link?)

That doesn't explain why almost no-one uses MORE!

Andy

DAB aerial
 

On 2008-01-24 20:14:58 +0000, Andy Champ said:

tony sayer wrote:

But they promised us perfect reception free from crackles and hiss and
fading!.

And their was this CD quality issue;)...

LOL!

I've heard that 128k was the bare minimum, according to ofcom, and that
in no account should anyone use less. (anyone got the link?)

That doesn't explain why almost no-one uses MORE!

Andy

Well, I think we know the answer to that question.

DAB aerial
 

In message , Paul Martin
writes
In article ,
Andy Champ wrote:
tony sayer wrote:

But they promised us perfect reception free from crackles and hiss and
fading!.

And their was this CD quality issue;)...

LOL!

I've heard that 128k was the bare minimum, according to ofcom, and that
in no account should anyone use less. (anyone got the link?)

That doesn't explain why almost no-one uses MORE!

Channel 4's DAB MUX will use 96kbps joint stereo, or so I'm told.

They're not after listeners who tune in more than once then?

--
If one person has delusions, we call them psychotic. If, however, 1.5 billion
people have delusions we must apparently call them a religious group, and
respect their delusionary state.

DAB aerial
 

"Andy Champ" wrote in message
...
tony sayer wrote:

But they promised us perfect reception free from crackles and hiss and
fading!.

And their was this CD quality issue;)...

LOL!

I've heard that 128k was the bare minimum, according to ofcom, and that in
no account should anyone use less. (anyone got the link?)

That doesn't explain why almost no-one uses MORE!

Andy

My understanding was that the tests done by or on the behalf of the Moving
Pictures Expert Group indicated that MP2 shouldn't be used at less than
256k. Anything less was classed as being annoying.

S.


--
http://audiopages.googlepages.com

DAB aerial
 

In article , Paul Martin
scribeth thus
In article ,
Andy Champ wrote:
tony sayer wrote:

But they promised us perfect reception free from crackles and hiss and
fading!.

And their was this CD quality issue;)...

LOL!

I've heard that 128k was the bare minimum, according to ofcom, and that
in no account should anyone use less. (anyone got the link?)

That doesn't explain why almost no-one uses MORE!

Channel 4's DAB MUX will use 96kbps joint stereo, or so I'm told.

Last time I heard that bitrate was on ITV1's audio description
channels, where it sounded foul. "Crunchy audio" is how I described it
at the time. ITV's AD is now 128kbps -- a minor improvement.

The BBC, for all their faults, run their TV channels with 256kbps
discrete stereo audio, even the AD soundtracks. (The "red button"
channels are 192kbps on DSat, as are their main radio channels on
DSat.)


Bayern Klassik on German satellite runs their audio services on 320
K/Bits, but 441 odd when their doing Dolby 5.1!..

128K is considered, well, OK for just info services using Mono speech...
--
Tony Sayer

DAB aerial
 

On 2008-01-24 22:51:11 +0000, Paul Martin said:

In article ,
tony sayer wrote:
In article , Paul Martin
scribeth thus

The BBC, for all their faults, run their TV channels with 256kbps
discrete stereo audio, even the AD soundtracks. (The "red button"
channels are 192kbps on DSat, as are their main radio channels on
DSat.)

Bayern Klassik on German satellite runs their audio services on 320
K/Bits, but 441 odd when their doing Dolby 5.1!..

128K is considered, well, OK for just info services using Mono speech...

NDR TV - 192kbps stereo.
WDR TV - 192kbps stereo.

Also, WDR's video bitrate is about 2.5 times that of NDR. German TV
stations use left channel for programme audio and right channel for
audio description, even on digital satellite.

(Comparing my different recordings of "Dinner for One".)



A wonderful production, seen every new year's eve in virtually every
country in Europe apart from the UK. In Germany on pretty much every
channel.

Germans are really surprised to hear that most people in the UK have
never heard of it or seen it. This is classic slapstick and is
appreciated in much the same way that Mr. Bean is also popular.

There are some copies on Youtube, but many have been truncated. The
proper version begins with an introduction by a German announcer
explaining what it is all about and in total lasts for about 18 minutes.