[cma-l] DRM+
LOL GELLOR
lolgellor at yahoo.co.uk
Mon Jan 10 19:10:46 GMT 2011
Good and knowledgable over view Clive as always - for those old enough - there we have it DAB an 8 track cartridge being presented as VHS whereas DRM gets lined up as the Betamax - that is to say DAB outdated and expensive (to recieve and broadcast) gets marketed to death (not soon enough though) - the more efficient, greater potential and cheaper system (DRM) hovers marginalised on the peripherary of the dance hall like a gorgeous thing with all kinds of concealed charms aching to have her day - but no she's just not one of the "in" crowd. Does this sound familiar?
--- On Mon, 10/1/11, Clive Glover <clive.glover at lineone.net> wrote:
From: Clive Glover <clive.glover at lineone.net>
Subject: Re: [cma-l] DRM+
To: "mark polden" <markianpolden at hotmail.com>
Cc: "CMA-L" <cma-l at commedia.org.uk>
Date: Monday, 10 January, 2011, 17:54
I understand that DRM+ has multiplex capabilities so it is possible to include more than one broadcast service within a transmission. However, part of the design criteria is that it can be used by a small station for a single service without significant changes to the existing FM system or huge extra costs. It has been suggested that a DRM+ transmitter should cost no more that 20% more than an equivalent FM one.
If you have an existing FM transmission site you would need to add a second transmitter (for DRM+) and a second antenna (assuming DRM+ would be using the same VHF Band II frequencies of 88-108 MHz). The DRM+ signal would need to be on a different frequency (perhaps adjacent or perhaps all grouped together within a sub-band) and you would need a lower powered transmitter to get the same coverage area as the existing FM signal.
I am not a broadcast engineer but I have been discussing this with one who understands all this (and has experimentally set up a DRM+ system to try it out). I conclude that implementing a DRM+ service would be fairly easy, certainly in comparison with DAB where you need to be able to send your signal to a remote central multiplex which, assuming you want it to be a decent quality signal, is costly.
Of course, the big problem is finding listeners with DRM+ radios (of whom there are basically none at present!). The chips in DAB/DAB+ radios are capable of handling this in theory but it will need all manufacturers to be told to switch on this capability for future receivers. So any introduction of DRM+ or any other new digital system will take many years, just as DAB has.
Not really a practical solution then!
regards,
Clive Glover
On 9 Jan 2011, at 21:29, mark polden wrote:
Correct me if I am wrong but I always understood that DRM was not a multiplexed system so therefore the cost would remain with the broadcaster, which would be better for this sector although you would all have the same problems as we are having with MW in siting an antenna with planning permission and greenbelt
Mark PoldenFlame CCR
Date: Sun, 9 Jan 2011 11:35:07 -0800
From: martin at martinsteers.co.uk
To: transplanfm at hotmail.com; cma-l at commedia.org.uk
Subject: Re: [cma-l] DRM+
I have to disagree slightly, although i see an upgrade from DAB to another system in the future (similar to Freeview to HD Freeview etc) its a long way off in the future.
We are going to be using DAB for another 5-10 years at least..
Because its all down to money at the end of the day.. Unless the government wants to spend alot of money on a new network, transmissions costs etc then its not going to happen..
Do you think commercial radio groups and stations would replace technology, do you think multiplex operators will pay for another / new licence and kit...
Do you think the public will replace their DAB radios? (which arent compatible, although most new Digital radios can work on other systems there are still tens of thousands of current sets that are DAB only) or do you think they will agree to the Government and BBC spending lots of money to replace the system.
What we really need is for all broadcasters to get behind it and work together, and ideally more spending by the government on transmitters, publicity, radio exchanges who knows what else... and an inclusive plan forward that includes community broadcasters and the promoted longevity of FM as well as DAB.
Digital radio is good for everyone, the listener with more choice and maybe better quality, the stations with more opportunities.. including community radio stations
Martin
From: Ian Hickling <transplanfm at hotmail.com>
To: martin at martinsteers.co.uk; cma-l <cma-l at commedia.org.uk>
Sent: Sun, 9 January, 2011 10:08:19
Subject: [cma-l] DRM+
My view is that it's excllent news.
Digital radio is certainly here to stay.
DAB frankly isn't.
We'll have to endure its shortcomings whilst enjoying its benefits - and see negligeable expansion other than that entirely caused by blind political pressure.
It illustrates a headlong rush to unilaterally achieve a poorly-conceived goal without the right research or the correct level of collaboration with the rest of the world-wide Industry.
Date: Sat, 8 Jan 2011 07:22:06 -0800
From: martin at martinsteers.co.uk
To: cma-l at commedia.org.uk
Subject: Re: [cma-l] Fwd: DRM+ tests in the UK
This isnt great news.. good and interesting granted.
I have nothing against trailing an system and seeing what happens.
HOWEVER as a radio industry there has to be a continuation of the digital expansion and migration, to attempt to alter the plan now at this stage would be disastrous.
DAB no matter what peoples thoughts are, is here to stay for a while.
Martin
From: Alan Coote <alan.coote at btinternet.com>
To: jaqui devereux <jaqui.devereux at commedia.org.uk>; cma-l <cma-l at commedia.org.uk>
Sent: Fri, 7 January, 2011 17:16:30
Subject: Re: [cma-l] Fwd: DRM+ tests in the UK
At last!!!!!,
Although it doesn't seem as Ofcom are actively involved. Anyone know if they
have just sanctioned the trial for DRM Consortium to run? And where will be
result go?
Alan
-----Original Message-----
From: cma-l-bounces at mailman.commedia.org.uk
[mailto:cma-l-bounces at mailman.commedia.org.uk] On Behalf Of jaqui devereux
Sent: 06 January 2011 2:23 PM
To: cma-l
Subject: [cma-l] Fwd: DRM+ tests in the UK
Dear all
You might be interested in this - DRM+ trials in Scotland
Will keep you posted when we get more information
Best wishes and Happy New Year to you all
Jaqui
---------- Forwarded message ----------
From: Christer Hederström | Ideosphere <christer.hederstrom at comhem.se>
Date: 6 January 2011 13:22
Subject: [Members_cmfe] DRM+ tests in the UK
To: CMFE Members <members_cmfe at lists.freie-radios.at>
DRM+ trial in the UK in first quarter of 2011
The DRM Digital Radio Mondiale standard was extended in 2009 to add an
additional mode for operation in the VHF broadcasting bands (known as
DRM+), enhancing the established capability of DRM for digital radio
services in the bands below 30 MHz.
DRM provides many features to allow user-friendly, high quality radio to be
broadcast, including use of station names rather than frequencies,
consistent digital audio, additional text and visualisation, an EPG,
alternate service signalling, and automatic service following to DRM, DAB,
FM and AM services.
After the successful trial in Sri Lanka (November 2010) the DRM Consortium
will mount a comprehensive DRM+ trial in the UK. The trial will take place
in the Edinburgh area of Scotland in the first quarter of 2011. Its
objectives are:
• To measure the coverage of DRM+ operating in various transmission
modes (lower capacity, higher ruggedness; higher capacity, lower
ruggedness)
• To compare the coverage of FM and DRM+ in terms of transmit power
• To assess the impact of DRM+ on FM and vice-versa
• To demonstrate the performance of DRM+ in a range of environments
throughout the coverage area, for example, urban, suburban, rural, etc., and
therefore provide an analysis of performance in the presence of multipath
interference, terrain shielding, man-made obstructions, etc., in both strong
and weak signal areas;
• To measure the pattern of the antenna in order to correlate
performance in different directions with expected performance;
• To provide suitable measurement data to international regulatory
bodies, such as CEPT and ITU.
(Source: DRM Consortium)
_______________________________________________
Members_cmfe mailing list
Members_cmfe at lists.freie-radios.at
http://lists.servus.at/mailman/listinfo/members_cmfe
--
Jaqui Devereux
Director, Community Media Association
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