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Old 09-02-2007, 15:47   #1
MikeB
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BBC to trial DRM on medium wave from Plymouth

http://www.bbc.co.uk/pressoffice/pre...09/trial.shtml
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Old 11-02-2007, 09:56   #2
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Quote:
The trial will be broadcast on 855 kHz.

For me there is hardly any chance to receive anything as there is a local 5kW AM station on 855kHz just 40km from here.
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Old 12-03-2007, 14:58   #3
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Here is a link to the FAQ's, I guess this was needed after it was announced the MF frequency would "end" in the Plymouth area.

BBC test faq
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Old 02-04-2007, 14:00   #4
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and here's a link to the legal jargon for those participating in the test:
jargon
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Old 02-04-2007, 15:54   #5
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Are they using the Morphy Richards for the trial or the Himalaya models that were used in Kigali?

A contact of mine has just rung BBC Radio Devon, the analogue signal was switched off yesterday and they are anticipating that the DRM tests will commence on April 23rd.
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Old 02-04-2007, 16:04   #6
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Hi Mike,
I don't think it has been decided yet but my contact said ideally a mixture of different receivers would be best for the trial. So in reality that's likely to be a mixture of the Morphy and Himalya as they are the only 2 Rx to have been made in significant quantities to date.
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Old 02-04-2007, 22:07   #7
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Is it live live then ? I guess not, what's the delay ?
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Old 03-04-2007, 15:17   #8
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Quote:
Originally Posted by jbriggs
....a mixture of different receivers would be best for the trial.
James
It would be great if there would also be a Rx for mobile reception available for the trial.
Simone
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Old 03-04-2007, 21:27   #9
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Interesting piece here about how the BBC engineers are measuring local
interference whilst 855 is off the air:

http://www.bbc.co.uk/devon/digitalme..._feature.shtml
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Old 12-04-2007, 07:27   #10
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Its on..

Quote:
Originally Posted by MikeB
Interesting piece here about how the BBC engineers are measuring local
interference whilst 855 is off the air:

http://www.bbc.co.uk/devon/digitalme..._feature.shtml





Radio Devon are now radiating a "test loop" presumably until the service officially goes live.


Frank

Last edited by FDJ : 20-04-2007 at 11:12.
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Old 12-04-2007, 22:19   #11
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Test Loop

Hi. Can I ask - is anyone able to record the audio so I can hear it? Thanks.
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Old 13-04-2007, 16:38   #12
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Quote:
Originally Posted by jimbo
Hi. Can I ask - is anyone able to record the audio so I can hear it? Thanks.
Sorry, I have had to remove the file.

Frank

Last edited by FDJ : 20-04-2007 at 11:14.
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Old 13-04-2007, 23:22   #13
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Thanks for that. I wonder how far it gets out at night?
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Old 14-04-2007, 18:43   #14
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Quote:
Originally Posted by jimbo
Thanks for that. I wonder how far it gets out at night?

And even more interesting would be to see a logfile showing how bad results get at night at maybe 15- 20km from the Tx where it works OK at daytime.
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Old 16-04-2007, 14:57   #15
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Frank - thanks for the Mp3 file, it does not sound too bad at all, what bitrate was being used (for DRM not Mp3)?

Concerning the logging, I recently saw a presentation at BBC R&D, they mentioned there will be 2 or 3 long term logging receivers in the Plymouth area that are already set up. I think some of these Rx will be in the 15 - 20 km range, and so will pick up & log skywave interference. In fact they even demonstrated an application to send the received audio via the internet (both AM and DRM) combined with Google Earth - it was a very impressive demonstration.

James
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