TDF - special DRM transmissions to Finland

simone · 12-01-2009, 16:21

This week TDF will perform special SW DRM test transmissions to Finland:

Coding parameters:
Mode : DRM
Cr = 0.6, bit rate # 21 kbits /sec
Audio encoding : AAC / SBR
Tx Power = 150 kW RMS

Code:

Wednesday 14 and Thursday 15 January 2009, from 08.00 to 16.00

   *Frequency = 9725 kHz*
    Antenna: 4/4 at 35°
    Time: 08:00:30- 08.59 TU
    Audio Program: Chinese
  
    *Frequency = 11875 kHz*
    Antenna: 4/4 at 35°
    Time:  09:00 -14.59 UTC
    Audio Program: Chinese.
  
    *Frequency = 9725 kHz*
    Antenna: 4/4 at 35°
    Time: 15.00-15.57 UTC
    Audio Program: Chinese.


 Friday 16 January, from 08.00 à 10.00

     *Frequency = 9725 kHz*
     Antenna 4/4 at 35°
     Time: 08:00:30- 08.59 UTC
     Audio Program: Chinese.
  
     *Frequency = 11875 kHz*
     Antenna: 4/4 at 35°
     Time: 09:00 -10.00 UTC
     Audio Program: Chinese.

update:
on Jan 14 1900-2100 UTC on 5865 kHz 
on Jan 15 1700-1800 UTC on 9725 kHz

TDF are interested in reports, please use this thread for reception results.

Thanks,
Simone

Owdjim · 14-01-2009, 08:06

Hi All

9725 kHz has provided very good reception here in Wellington, New Zealand.

This is about as good as DRM gets in this part of the world.

11875 kHz is also equally as good at the moment (0900 UTC).

73 Chris

Ager · 14-01-2009, 08:17

Received 100%, no problems with the very stable signal. First part of the first transmission was Chinese, then English. Sound quality is very good but apparently some parts are compressed differently than others since there is a slight (not disturbing) audible difference.

I hope TDF will have real logs from this sparsely populated area.

drmdab · 14-01-2009, 12:45

Hu Jintao was watching me...

89% CDA outside of the target area.

Ager · 14-01-2009, 14:04

Signal remained strong and stable all the time, but sound was lost at about 11 UTC (I was not listening at the moment). Break in TX at 11:22 did not bring it back. Another break 11:32, no success neither. At 11:45 data source was labeled TDPRadio! No sound though. New TX breaks at 11:51, 11:55, and 11:57 again.

After 11:57 it was ok with proper source information and CRI audio, and with the stable 26 dB. I had no chance to listen all the time but I kept recording. Looking at the graphics now, I see that there were no more interruptions.
AAC SBR param stereo 19.1 kbps + Slideshow 1.8 kbps

(What an interesting log I could have had. I wonder if I should install Dream again..?)

mitajohn · 14-01-2009, 14:35

Hi all,

I managed to receive this transmission, covered by the strong splatters of the TX on 11870 kHz. The signal was about 35 dBuV and the sound was very good. I also received some pics from the MOT service.

Ager · 14-01-2009, 14:59

Stable signal in today's last transmission, too.

So, what we had here was excellent propagation, good frequencies, pleasant sound quality, and interesting contents in the English speaking part. Problems (after 11:00 UTC) were TX-related.

What more could one wish? I know what.

Receivers! From China :-)

simone · 14-01-2009, 16:48

Thanks for reports so far, some more transmissions:

on Jan 14 1900-2100 UTC on 5865 kHz
on Jan 15 1700-1800 UTC on 9725 kHz

Sorry for late notice.
Simone

Owdjim · 14-01-2009, 17:56

Mostly unattended overnight log of 11875 kHz from Wellington. Not so good.

73 Chris

drmdab · 14-01-2009, 18:14

Quote:

Originally Posted by Ager

Receivers! From China!

Maybe they got some of those Uniwave Di-Wave-receivers which can display slideshows on their displays. By the way, nothing here on 9725 kHz now.

Ager · 14-01-2009, 18:16

Simone's figures must be upside down, there is TDF/CRI transmission on air now at 5865 kHz. SNR here 26,4, stable reception.

Chris: new try tomorrow, we are quite on the opposite sides of the globe;-)

tradio99 · 14-01-2009, 18:18

14.01.2009:
*Frequency = 9725 kHz*
Antenna: 4/4 at 35°
Time: 15.00-15.57 UTC
Audio Program: Chinese.
***
the last 30 minutes of transmission - good reception, CDA - 85%

zfyoung · 15-01-2009, 03:21

When it approaches dusk, I can pick up some audio.But then, strong AM interference cut short of the fun.

zfyoung · 15-01-2009, 03:24

14-01-2009, 08:17	#3
Ager Registered User Join Date: Jun 2004 Location: Finland Posts: 69	9725 Received 100%, no problems with the very stable signal. First part of the first transmission was Chinese, then English. Sound quality is very good but apparently some parts are compressed differently than others since there is a slight (not disturbing) audible difference. I hope TDF will have real logs from this sparsely populated area. Last edited by Ager : 26-01-2009 at 11:59.

14-01-2009, 14:04	#5
Ager Registered User Join Date: Jun 2004 Location: Finland Posts: 69	11875 Signal remained strong and stable all the time, but sound was lost at about 11 UTC (I was not listening at the moment). Break in TX at 11:22 did not bring it back. Another break 11:32, no success neither. At 11:45 data source was labeled TDPRadio! No sound though. New TX breaks at 11:51, 11:55, and 11:57 again. After 11:57 it was ok with proper source information and CRI audio, and with the stable 26 dB. I had no chance to listen all the time but I kept recording. Looking at the graphics now, I see that there were no more interruptions. AAC SBR param stereo 19.1 kbps + Slideshow 1.8 kbps (What an interesting log I could have had. I wonder if I should install Dream again..?)

14-01-2009, 14:59	#7
Ager Registered User Join Date: Jun 2004 Location: Finland Posts: 69	9725 Stable signal in today's last transmission, too. So, what we had here was excellent propagation, good frequencies, pleasant sound quality, and interesting contents in the English speaking part. Problems (after 11:00 UTC) were TX-related. What more could one wish? I know what. Receivers! From China :-)

14-01-2009, 18:16	#11
Ager Registered User Join Date: Jun 2004 Location: Finland Posts: 69	5865 Simone's figures must be upside down, there is TDF/CRI transmission on air now at 5865 kHz. SNR here 26,4, stable reception. Chris: new try tomorrow, we are quite on the opposite sides of the globe;-)

14-01-2009, 18:18	#12
tradio99 Registered User Join Date: Aug 2003 Location: Liepaja, Latvia Posts: 50	14.01.2009: Frequency = 9725 kHz Antenna: 4/4 at 35° Time: 15.00-15.57 UTC Audio Program: Chinese. *** the last 30 minutes of transmission - good reception, CDA - 85% __________________ Vladimir Last edited by tradio99 : 14-01-2009 at 18:34.

14-01-2009, 16:48	#8
simone simone Join Date: Jan 2003 Location: Bad Salzschlirf, Hessen, Germany Posts: 8,712	Thanks for reports so far, some more transmissions: on Jan 14 1900-2100 UTC on 5865 kHz on Jan 15 1700-1800 UTC on 9725 kHz Sorry for late notice. Simone

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