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Old 19-10-2018, 03:39   #1
Braccini
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Radio Romania Int. 9490 kHz in Spanish

Dear Mr . Francisco,

For B18 period, is not possible to maintain 11650 kHz frequency for DRM broadcasting, because within the time intervall 22:00-23:00 UTC, this frequency(11650 kHz) is used by another broadcaster, with the target coverage area in Europe. To avoid interference, the transmission will continue on the frequency 9490 kHz.

Have a good day Mr.Francisco.

Radu Hajdeu

Inginer

Serviciul Radiodifuziune
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Old 19-10-2018, 03:41   #2
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16-QAM PS or Mono +SBR?

I asked them to improve their audio quality. I hope he does it.
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Last edited by Braccini : 19-10-2018 at 03:44.
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Old 29-10-2018, 22:41   #3
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Clint, let me know as I doubt that I'll be able to decode it. However, for the first time in my life, I have SOME hope of decoding SOME audio from RRI due to their use of 16 QAM modulation for this broadcast. Here's my partial log for today which I'll be religiously attempting to decode as long as the channel remains clear and 16 QAM is maintained. I'll ignore my desire to ignore AAC+ for this broadcast since I've NEVER decoded any audio from RRI as far as I recall.

Frequency: +
Modulation: + (16 QAM so great!)
Codec: - (Well, you already know my feelings on this issue! )
Attached Images
File Type: png 9490-181029-2218-2257-TPR.png (36.1 KB, 100 views)

Last edited by tpreitzel : 29-10-2018 at 22:50.
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Old 30-10-2018, 23:11   #4
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Oct 30th, 2018 log ...

Frequency: +
Modulation: +
Codec: -
Attached Images
File Type: png 9490-181030-2158-2257-TPR.png (37.7 KB, 92 views)
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Old 30-10-2018, 23:32   #5
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Quote:
Originally Posted by tpreitzel
Clint, let me know as I doubt that I'll be able to decode it. However, for the first time in my life, I have SOME hope of decoding SOME audio from RRI due to their use of 16 QAM modulation for this broadcast. Here's my partial log for today which I'll be religiously attempting to decode as long as the channel remains clear and 16 QAM is maintained. I'll ignore my desire to ignore AAC+ for this broadcast since I've NEVER decoded any audio from RRI as far as I recall.
Excellent, yes, RRI transmitter
Frequency: +
Modulation: + (16 QAM so great!)
Codec: - (Well, you already know my feelings on this issue! )
Excellent, RRI's transmitter has an problem:
- we checked the possibilities to set the exciter for 16 QAM in stereo mode, but it generate some incompatibility message, thus it can used only mono for 16QAM.We'll ask more details to manufacturer if possible to improve this.

Gabriel Stanciu - RRI's Spectrum Manager
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Old 30-10-2018, 23:32   #6
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Quote:
Originally Posted by tpreitzel
Clint, let me know as I doubt that I'll be able to decode it. However, for the first time in my life, I have SOME hope of decoding SOME audio from RRI due to their use of 16 QAM modulation for this broadcast. Here's my partial log for today which I'll be religiously attempting to decode as long as the channel remains clear and 16 QAM is maintained. I'll ignore my desire to ignore AAC+ for this broadcast since I've NEVER decoded any audio from RRI as far as I recall.
Excellent, yes, RRI transmitter
Frequency: +
Modulation: + (16 QAM so great!)
Codec: - (Well, you already know my feelings on this issue! )
Excellent, RRI's transmitter has an problem:
- we checked the possibilities to set the exciter for 16 QAM in stereo mode, but it generate some incompatibility message, thus it can used only mono for 16QAM.We'll ask more details to manufacturer if possible to improve this.

Gabriel Stanciu - RRI's Spectrum Manager
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Old 31-10-2018, 07:36   #7
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Hi Francisco!

For the DRM transmissions, RRI uses a mono signal cut at 5 kHz, optimized for AM. Setting the exciter to stereo would not improve audio quality, as the source is only in mono. The DRM signal would probably solely need a higher bitrate, thus resulting in a lower robustness of the signal.

73,
Alex
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Old 31-10-2018, 08:20   #8
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Quote:
Originally Posted by AlexDRM
Hi Francisco!

For the DRM transmissions, RRI uses a mono signal cut at 5 kHz, optimized for AM. Setting the exciter to stereo would not improve audio quality, as the source is only in mono. The DRM signal would probably solely need a higher bitrate, thus resulting in a lower robustness of the signal.

73,
Alex
Hello Alex, nice to see you here!

Would mono in the AAC + SBR configuration, which would increase the audio band from 5 kHz to 10 kHz, could it be possible?
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Old 31-10-2018, 12:25   #9
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Quote:
Originally Posted by AlexDRM
Hi Francisco!

For the DRM transmissions, RRI uses a mono signal cut at 5 kHz, optimized for AM. Setting the exciter to stereo would not improve audio quality, as the source is only in mono.

73,
Alex

Sigh ... At least, RRI is broadcasting digital on shortwave...

@Clint
Thanks for keeping us informed of this issue. Hopefully, RRI can eventually raise the quality of their digital broadcasts on shortwave while retaining the robustness of 16 QAM. After Alex's explanation, for the life of me, I can't understand why RRI is using their current digital configuration even to Europe.

Last edited by tpreitzel : 31-10-2018 at 12:32.
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Old 31-10-2018, 22:34   #10
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RRI 9490 kHz Reception near Atlanta, Georgia, USA

This evening's reception from the side of the beam - 13.56% audio decoded, 14.10 dB max SNR.
Attached Images
File Type: png 9490-181031-2202-2300-Zyg.png (37.7 KB, 93 views)
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Old 01-11-2018, 01:01   #11
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Oct 31st, 2018 log ...

Frequency: +
Modulation: +
Codec: -
Attached Images
File Type: png 9490-181031-2158-2257-TPR.png (37.5 KB, 90 views)
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Old 01-11-2018, 08:14   #12
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Quote:
Originally Posted by tpreitzel
Sigh ... At least, RRI is broadcasting digital on shortwave...

@Clint
Thanks for keeping us informed of this issue. Hopefully, RRI can eventually raise the quality of their digital broadcasts on shortwave while retaining the robustness of 16 QAM. After Alex's explanation, for the life of me, I can't understand why RRI is using their current digital configuration even to Europe.
For it is Tpreitzel that RRI has a super strong signal in Europe, so that's a burst there. Funny thing is that in mono + SBR, as in stereo for parametric, it has bitrate of 21 kbps.


RRI 6030 DRM, mono AAC+: https://youtu.be/GXjrq55Iimc
RRI 13730 DRM, PS in Brazil: https://youtu.be/pMEYVPaC__w Only in the first few days did it last year. Then it did not pick up any more, very weak.
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Last edited by Braccini : 01-11-2018 at 08:19.
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Old 04-11-2018, 00:35   #13
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November, 3th

Excellent signal in South of Brazil. MER MAX: 17dB.

Full Program Part 1: https://youtu.be/78AbbZorgtc
Full Program Part 2: https://youtu.be/_63rtmNqH2g
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Old 04-11-2018, 17:49   #14
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Getting a good signal from this one here as well, I could never hear it on the higher frequency.
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Old 04-11-2018, 18:56   #15
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Quote:
Originally Posted by Braccini
For it is Tpreitzel that RRI has a super strong signal in Europe, so that's a burst there. Funny thing is that in mono + SBR, as in stereo for parametric, it has bitrate of 21 kbps.


RRI 6030 DRM, mono AAC+: https://youtu.be/GXjrq55Iimc
RRI 13730 DRM, PS in Brazil: https://youtu.be/pMEYVPaC__w Only in the first few days did it last year. Then it did not pick up any more, very weak.

As long as atmospheric conditions are favorable and the European listener is fairly close to the center of the beam. I've seen NUMEROUS logs from listeners in parts of Europe when RRI's signal suddenly takes a dive typical of shortwave where 16 QAM would allow an average of 12% longer decoding versus 64 QAM. Even 5 to 10 minutes per hour is worth dumping 64 QAM.
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