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-   -   Voice of Nigeria 15120 kHz from Abuja (http://www.drmrx.org/forum/showthread.php?t=2390)

Digger 07-03-2012 12:20

Voice of Nigeria 15120 kHz from Abuja
 
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A test transmission from Voice Of Nigeria. Low bitrate but fairly good sound when they played music but terrible when they started talking. Riyadh killed the fun just before 12 UTC.

Sixten 07-03-2012 12:32

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Test transmission from VON . Log 57min.

Sixten 07-03-2012 15:41

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More test transmission Log 2h 14min. But very problem for strong AM .

Vet good TX SNR up to 32.5dB ...

drmdab 07-03-2012 16:17

I clicked the checkbox to log the reception, however, DREAM did not write anything usefull for the plotter into the files.
At least it recorded this: SNR min: 3.1, max: 19.7 (I guess the max. was at about 1440 UTC when I stopped the log)

Sixten 08-03-2012 09:35

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Log this morning 51min. Very strong signal ,but very bad audio !!!! BW3kHz:confused:

Digger 08-03-2012 09:53

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My log resembles Sixten's very much in regard to the Doppler values. A few drop-outs might have been due to the use of electric machinery in the house. The transmission ended suddenly at 0920 UTC.

I think that the audio was pretty good despite the low bitrate. The levels were perfect and the vocals sounded rather good even though the audio bandwidth was limited to 3000 Hz.


(Thanks Simone for fixing the headline)

Sixten 08-03-2012 15:58

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More log today. Very strong AM in 1503 log. Last.

Digger 08-03-2012 18:55

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An unattended log from this afternoon. Severe co-channel QRM from a 500 kW AM TX in Saudi-Arabia. By the way, Voice Of Nigeria is not scheduled for this time of the day on 15120 kHz.

Sixten 09-03-2012 11:32

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Very good signal stringth this morning 44dbuV from start down to 28dbuV 1120UTC Log 1h 40min.

Digger 09-03-2012 14:45

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Nearly perfect reception this morning. Nice text message: "Test with THOMSON transmitter TSW2300D. 125 kW, fixed curtain antenna to North. Greeting from Abuja, Nigeria."

Is this only a temporary test, or will they continue until I arrive back in Switzerland around the 25th March? :confused:

@Simone: Thanks, dunno what happened there... Five views down the drain - hihi :o OK, the whole window must be on the desktop... I see...

simone 09-03-2012 18:02

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Not as good over here.
@ Digger: Can you please check your attachment. As far as I know it is only a test transmission for now.

Simone

Sixten 12-03-2012 11:42

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Log 3h 19min. Propagation better today on 15Mhz . Signal stringth was S9+20dB in start. And down to S9 in stop time. 1130.UTC

Her is report this morning Bodo.
And picture of 15Mhz band this morning.

Digger 12-03-2012 12:17

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Almost perfect reception except towards the end in this mostly unattended log. I heard the start and listened for an hour or so, then I had to leave. The Doppler was fairly high at times, the SNR dipped suddenly around 0835 UTC but around 0912 it rose again suddenly. Perhaps this was caused by splatter from an adjacent channel. SNR peaked at 24 dB on my Roadstar, which never produces much higher values.

drmdab 12-03-2012 16:39

Just found this on German A-DX mailinglist:

> Bodo, 5N7Q, is in Abuja since last Wednesday, testing everyday on 15120
> and 11770 kHz DRM.
>
> Official inauguration ceremony on 13 March from 0800 till 1200 UTC with
> special broadcast on 15120 kHz DRM (including Nigerian President speaking
> live around 0930 UTC).


(Harald Kuhl, via DXplorer, forwarded to A-DX by Wolfgang Büschel)

simone 12-03-2012 22:41

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Quite good results in the first 2.5 hours, nothing received on the other frequency today.
Simone

Sixten 13-03-2012 12:12

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Hi Bodo.

Perfect reception from start , 0800 to 1130 , now start strong AM on freq.
Fantastic strong and stabil signal from Nigeria .:) :) :)

SNR MAX 32.37db
And i can see this audio is from studio , and gives bad quality, thats what i transmit on DRM.

Digger 13-03-2012 20:23

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I saw DRM just after 07 UTC, but just for a minute and enough to shoot the Label. At 0725 UTC the signal came back, but there was strong co-channel interference, which could be seen in SNR Spectrum in Dream. At 0758 UTC the Co-channel QRM ended and the decoding was perfect. I noted at 0943 UTC that the channel was still clear since 0758 UTC. Around 1000 UTC the signal had gotten weaker but a fair signal, clear channel, perfect decoding of 9.1 kbps. Then there was a TX break just before 09 UTC, and I stopped my log by mistake. Unfortunately Dream crashed as well, adding to my problems. So my log for today is a bit of a patchwork. The second screen-shot is the best part from 0758 to 1005 UTC with 99.86% CDA. Very good. I also recorded a few hours of audio if anyone is interested.

simone 14-03-2012 21:19

March 13
 
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Good results in the first two hours yesterday.

Simone

Sixten 19-03-2012 20:09

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Very good propagation from Nigeria, but to hi audio level.

Sixten 20-03-2012 20:10

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Very strong and stabile RF signal this evning also nu problem with audio level from time to time.

Audio Level swing from -65dB to -20dB .

Digger 20-03-2012 21:16

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No audio from time to time, and there seems to be a problem with the audio input levels from the studio. Extremely high Doppler values, but it seems like the Mode C and the low Bit Rate provides robust audio and good reproduction. However, the audio quality suffers from this to a great extent.

FritzWue 21-03-2012 20:14

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VoN was obviously testing a lot.
Before start of my log they were running 20 kHz mode, but nothing decodable here.
The doppler values were very high.
The audio was very bad at 9 kbps, worse than AM!
Unfortunately DReaM crashed at last and my recorded wav file turned out to be corrupt.
Here is the schedule: http://www.voiceofnigeria.org/freq.htm

Sixten 21-03-2012 20:36

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Log only 1h no audio , total silence !!!!!:confused:

Digger 21-03-2012 22:28

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I did not notice any other mode than the C/10 kHz, but we had guests here and I was not glued to the PC all the time. I just noticed that the DRM started, so I started logging. There was no audio at all until I switched off. At that time MSC was red and SDC was red. The upper part of the SNR Spectrum was missing. My log did not record any mode changes. The Doppler was high and around 1850 UTC it went over the top of the log plot window. :eek:

Sixten 22-03-2012 20:05

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Log this evning . 1h 13min.

Digger 22-03-2012 20:07

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100% decoded horrible audio. Sometimes there was no audio at all, but most of the time there was. Doppler left the screen around 1930, but it became lower again around 1954 UTC. Interestingly enough, the audio was robust enough to withstand the very high Doppler.

Sixten 23-03-2012 19:14

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Log this evning 34min. Fantastic strong signal stringth in start S9+40db =74dbuV. Sorry for bad audio from studio.

f1tay 26-03-2012 20:14

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Reception at Paris. Signal very good but bad modulation with frequent interruption.
Daniel

Très fort signal ici mais mauvaise modulation (fort taux de compréssion) avec de nombreuse coupure de la BF.
Daniel

MARCEL 26-03-2012 20:28

Bonsoir Daniel, ici pareil très bon signal mais coupures fréquentes avec comme un top synchro.

Hello ALL

Reception in Northeast France is Good SNR : 21 to 21,5 DB modulation is good, many stop from audio is curious.

Sixten 27-03-2012 21:11

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Log this evning 1h 30min. Very strong signal but problem with audio.

S9+20dB and MAX SNR 26.73db Very good DRM signal.

Digger 27-03-2012 21:17

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A 62 minutes log until QRT. High Doppler values, almost perfect CDA, but many problems with interruptions in the audio. And why not test a different DRM mode?


PS, I got an answer to my e-mail:
"Thanks for your mail. We are constantly relying on reports like yours to improve our transmission. Kindly keep sending your observations. Thanks.
A. A. AbdusSalam
Special Assistant To Director General"

Sixten 28-03-2012 21:22

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Log 1h44min. but now is conds go down to niose. From S9+10db to S5.

Digger 28-03-2012 21:40

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A mostly unattended log. I had set it to shut down at 2000 UTC. An almost perfect result, but still audio problems. The Doppler is extremely high. I'm surprised that there is audio at all under these conditions.

DH5YM 29-03-2012 21:12

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stable reception here in Dresden during the complete transmission. Just some problems with a neighbour AM station.
I use just a small indoor antenna close to the window. Due to the 16QAM i had not so many audio drops.

Sixten 29-03-2012 21:23

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This DRM signal is for me big mystery. Doppler go up over 3Hz and give no problem for audio. Signal stringth this evning was S9+10dB=44dbuV , from start to end of transmission and no fading very stable, SNR 29dB in start and go down to 20dB after 20min . to stop. :confused: :confused:

So pleas switch over to MODE B and 16.92kbps . MONO. for test.

Sixten 30-03-2012 21:13

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No diff. to evning same signal stringth S9+10dB=44dbuV, MAX SNR in start 29.14dB. and doopler up over 3Hz ?????:confused:

DH5YM 31-03-2012 08:56

High doppler seems to be the same situation for RNZI if you look to the plots.
Probably we are measuring the speed of the Jetstream the signal has to pass !?

brouillage 13-04-2012 20:31

Good Reception results tonight (decoded audio without interruptions) on an unmodified Morphy Richards sitting on a windowsill with a PC running next to it.

Digger 13-04-2012 22:15

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High SNR, terrible audio quality partly because of the 9 kbps and that from Africa's most modern studios according to themselves. At least it withstood my 15 MHz BUZZZZ QRM that is present from time to time. Without this S7 noise blanket the result would perhaps have been even better. C'mon people, change the configuration!

Digger 17-04-2012 08:29

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High Doppler values but perfect decoding in this 90 minutes log. I don't understand why VON won't change the Mode to B and perhaps increase the Bitrate somewhat. :confused:
After all, VON claims that they have the most modern and up-to-date digital facilities in all of Africa. We could expect better audio quality under those conditions.

PS: This log is of course from Switzerland, not Stockholm!


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