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-   -   TDF - special DRM transmissions to Finland (http://www.drmrx.org/forum/showthread.php?t=2058)

simone 12-01-2009 16:21

TDF - special DRM transmissions to Finland
 
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 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

9725 kHz in NZ
 
2 Attachment(s)
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

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.

drmdab 14-01-2009 12:45

1 Attachment(s)
Hu Jintao was watching me... :D

89% CDA outside of the target area.

Ager 14-01-2009 14:04

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..?)

mitajohn 14-01-2009 14:35

Jan. 14 (11875 kHz)
 
2 Attachment(s)
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

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 :-)

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

11875 kHz
 
1 Attachment(s)
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

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;-)

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

2 Attachment(s)
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

2 Attachment(s)
More MOT slide shows.

Owdjim 15-01-2009 08:08

9725 kHz in NZ
 
2 Attachment(s)
Hi All

9725 kHz provided a very good signal again here in NZ from 0800-0900 today.

I'm always still amazed when I get reception like this and hear how good DRM can sound right around the world :)

I've made an animated GIF of today's slideshow, which today includes a photo of Montsinery.

11875 kHz is currently now providing excellent reception, but if it is like last night it will suffer co-channel AM interference from 0930.

Cheers, Chris


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