DAB aerial

[Andy Burns]

The guard interval for DAB is 246 microseconds, hence

*+246+microseconds+in+miles

[Bill Wright]

thought it was more than adequate.

Bill

[Don Pearce]

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.

d

[Mark Carver]

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 :-) )

[tony sayer]

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

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

[Don Pearce]

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

[Mallory]

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

[Andy Champ]

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

[Andy Hall]

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

[Paul Martin]

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.)

[Tony Quinn]

In message , Paul Martin writes

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

[Serge Auckland]

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.

[tony sayer]

In article , Paul Martin scribeth thus

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...

[Paul Martin]

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".)

[Andy Hall]

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.

[geoff]

I managed to pick it up on 5 different channels by satellite one year

Not only Dinner for one, how many people in the UK have even heard of Freddy Frinton ?

[Andy Hall]

Indeed.

He co-starred with Thora Hird in an early sitcom IIRC.

[geoff]

[Steve Firth]

You mean people would rather pluck out their eyeballs and roast them in hot sand than watch it?

[Tony Quinn]

Morning" .... and I'd hardly call mid 60's an early TV sitcom.