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Old 27-05-2009, 17:26   #121
PP5AZF-Ataliba
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DRM in Brasil

Gostaria que vocês lessem os textos que estou colocando sobre o que está sendo feito para termos o sistema DRM em todas as bandas (ondas médias, ondas tropicais, ondas curtas e FM) no Brasil: "DRM in Brazil"

http://www.drmrx.org/forum/showpost....7&postcount=27

I wish you read the texts that I am putting on what is being done to get the DRM system on all bands (medium waves, tropical wave, short wave and FM) in Brazil: "DRM in Brazil"

http://www.drmrx.org/forum/showpost....7&postcount=27
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Youtube channel:
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Last edited by PP5AZF-Ataliba : 27-05-2009 at 17:47.
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Old 28-05-2009, 11:10   #122
Roy Sandgren
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Very stupid to have 2 systems, HD-radio on mediumwave and DRM on shortwave. Needs 2 recievers or am I wrong???
DRM on 26MHz is great, can offer audio of 2x18 kHz or 2x20 kHz. better than HD-radio, but need a heigth of + 60 m and a power of 1 kW TX and a antiskywave antenna offers a radius of 50-100 km.
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Old 31-05-2009, 09:04   #123
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Ataliba
Bom dia!...Fico feliz por saber que finalmente o consorcio olhou para a América Latina, em especial para o Brasil!...Já era tempo né? A senhora Ruxandra sabe o que faz, e felizmente ela ja entendeu que o Brasil é um pais com enorme potencial para o DRM.
Um abraço desde Portugal
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Carlos
Sines - Portugal
Receiver TENTEC RX320 modified, R&S HEO10 active antenna, DREAM software...And...No more PLC/BPL QRM...Thanks ANACOM!
Save the Radio Spectrum! Eliminate Broadband over Power Line.
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Old 31-05-2009, 09:08   #124
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Please translate that and Swizzerland toke HD-radio, too, stupidos !!!
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Old 31-05-2009, 09:25   #125
CT4RK
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Ataliba
Bom dia!...Fico feliz por saber que finalmente o consorcio olhou para a América Latina, em especial para o Brasil!...Já era tempo né? A senhora Ruxandra sabe o que faz, e felizmente ela ja entendeu que o Brasil é um pais com enorme potencial para o DRM.
Um abraço desde Portugal
CT4RK
Carlos Mourato

DW HF Relay station - Sines Portugal

English

Ataliba
Good morning! I`m happy for know, that finally, the DRM consorcium, look for Latin América, especially to Brasil!...It was time to do it! Mrs Ruxandra knows wath make! She already felt that Brasil is a huge potential for DRM.

Regards from Portugal
Carlos Mourato
DW HF relay station Sines Portugal
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Carlos
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Receiver TENTEC RX320 modified, R&S HEO10 active antenna, DREAM software...And...No more PLC/BPL QRM...Thanks ANACOM!
Save the Radio Spectrum! Eliminate Broadband over Power Line.
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Old 31-05-2009, 09:46   #126
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Yap, plus India, Russia, China and Sweden etc. soon selling several 1000pcs aday. if we sell one drm reciver per sec, it will take hundred years untill all households got a reciver.
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Old 31-05-2009, 11:32   #127
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Quote:
Originally Posted by Roy Sandgren
Yap, plus India, Russia, China and Sweden etc. soon selling several 1000pcs aday. if we sell one drm reciver per sec, it will take hundred years untill all households got a reciver.

Making DRM popular and a receiver available and affordable in one thing.
The major aspect that might bother the reception quality is the Interference from most domestic appliances and from the digital terrestrial and radio based digital communication links used and/or proposed to be used by Electricity distribution agencies for their automatic metering , television internet transport links.
The next major interference is expected from non standard manufacture and supply of TV and other power supplies, Cell phone chargers without any line filters, and many more.
While the DRM technology is going woo customers on one side, the lack of co-ordination with other interfering agencies and non standard equipments are going to become a headache and definitely impede the growth of DRM.

Some special efforts are needed form the Transmitting groups and Radio receiver manufacturing groups and other service groups towards a clean reception platform across many countries.

Already the British Telecom supplied Power adopters of their local ISDN or DSL is already an issue that they are dealing with local Government over there.

ps: Unfiltered SMPS supplies of computer cabinets as supplied by China and Asian sources is another major interference source.
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Old 01-06-2009, 11:04   #128
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The future will tell us if DRM get the market. More TX on air, more hours will have the answer.
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Old 10-06-2009, 19:22   #129
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Quote:
Originally Posted by mvs sarma
The major aspect that might bother the reception quality is the Interference from most domestic appliances and from the digital terrestrial and radio based digital communication links used and/or proposed to be used by Electricity distribution agencies for their automatic metering , television internet transport links.
The next major interference is expected from non standard manufacture and supply of TV and other power supplies, Cell phone chargers without any line filters, and many more.

And DRM is known to be very susceptible to these kinds of signal impairments ... no word of robustness whatsoever.
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Old 11-06-2009, 08:02   #130
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The lobbyists of dab+ are working against all kinds of other better solutions like drm and drm+. DRM is great, due to the coverage of the groundwave in LW and MW. All new cars will have dab+, but not drm. The 11-m band drm get you a great audio of 2x20khz and a groundwave, better than dab+.
DRM+ in the VHF-band l = 47-68 MHz get you a speed of 183 bit and great coverage. DRM+ in band ll = 87,5 - 108 MHz gives you 4 channels in digital, same bandwith as FM, 300kHz. The licenceholder of DRM asking to much for the licence to use it in a transmitter, thats the great problem, in facto.
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Old 11-06-2009, 13:50   #131
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Think of modern cars as a big transmitting station of all sorts of noises and whistles.
You have to take into account that is DRM (not DRM+, don't know much of that) is - as I explained before - is bad in coping with this, so that car manufacturers have to improve their shielding measures by more than 10 - even 20dB against current levels. This will be very costly.
Of course they are not amused with this.
Then there is no demand as there are still no consumer receivers around - that means no pressure of customers who buy a car to get the feature into the car.
Then - of course - developers and decision-makers in the car industrie also use dream and other Software-Radio solutions to get an impression. They get drop-outs - which will cause complaints of end customers - which they are not willing to provoke.

My opinion is that we will never see Shortwave Radio in cars again in noteworthy numbers.
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Old 11-06-2009, 14:04   #132
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Hmm, maybe we should ask FritzWue for that. He has a car with DRM Reception. Maybe he can tell us how much afford it took to filter noise at his vehicle. His reception-results are quite impressive.

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Old 11-06-2009, 14:10   #133
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I have the carbox in my car, no roblems receiving RTL on shortwave and other drm stations, noice free receptions on shortwave.Only dropouts utside the main target area.
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Old 11-06-2009, 14:28   #134
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Some other people tried DRM on mobile reception, I think all of them were quite successful as you can see here
I remember the first time I have seen mobile reception of DRM, a demonstration by VTC in the city of Amsterdam which was quite impressive.
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Old 11-06-2009, 14:36   #135
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I also did some test drives with my camping car, mechanical injection etc.
Had impressive results of RTL in the basque region of Spain when driving through a valley. Modified standard car radio with a DRM module of BBC/CT.
Also had good results in passenger cars using a Laptop and Dream near Kaiserslautern and Pirmasens listening to different DW locations.
But half a year later when I wanted to show this to other - important - people except Sines everything else was just unstable.
Quote:
Originally Posted by maxpower
Hmm, maybe we should ask FritzWue for that. He has a car with DRM Reception.
First thing is that he uses a whip antenna of 1,4m, something you will never see in modern top class cars - they all have elements integrated in the window glass combined with an amplifier. Dashboard radiation interference is one of the resulting problems.

All of us here are experienced users and know about Ionosphere etc.
But for the mass market reception just has to work - always.
And that's what DRM on Shortwave cannot garantee, even DRM has to accept physical laws.
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Last edited by DRM-OM : 11-06-2009 at 18:05.
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