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13-03-2012, 12:12
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#16 |
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Registered User
Join Date: Jun 2005
Location: N59° 37' / E17° 50' Marsta Sweden
Posts: 2,894
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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. |
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13-03-2012, 20:23
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#17 |
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Registered User
Join Date: Mar 2005
Location: Shizuoka City, Japan
Posts: 9,652
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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.
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14-03-2012, 21:19
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#18 |
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simone
Join Date: Jan 2003
Location: Bad Salzschlirf, Hessen, Germany
Posts: 10,144
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March 13
Good results in the first two hours yesterday.
Simone |
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19-03-2012, 20:09
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#19 |
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Registered User
Join Date: Jun 2005
Location: N59° 37' / E17° 50' Marsta Sweden
Posts: 2,894
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Very good propagation from Nigeria, but to hi audio level.
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20-03-2012, 20:10
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#20 |
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Registered User
Join Date: Jun 2005
Location: N59° 37' / E17° 50' Marsta Sweden
Posts: 2,894
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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 . Last edited by Sixten : 21-03-2012 at 20:29. |
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20-03-2012, 21:16
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#21 |
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Registered User
Join Date: Mar 2005
Location: Shizuoka City, Japan
Posts: 9,652
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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.
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21-03-2012, 20:14
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#22 |
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Registered User
Join Date: Mar 2003
Location: 40km west of Muenster,NRW,Germany
Posts: 6,014
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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 Last edited by FritzWue : 21-03-2012 at 20:23. |
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21-03-2012, 20:36
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#23 |
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Registered User
Join Date: Jun 2005
Location: N59° 37' / E17° 50' Marsta Sweden
Posts: 2,894
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Log only 1h no audio , total silence !!!!!
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21-03-2012, 22:28
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#24 |
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Registered User
Join Date: Mar 2005
Location: Shizuoka City, Japan
Posts: 9,652
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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.
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22-03-2012, 20:05
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#25 |
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Registered User
Join Date: Jun 2005
Location: N59° 37' / E17° 50' Marsta Sweden
Posts: 2,894
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Log this evning . 1h 13min.
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22-03-2012, 20:07
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#26 |
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Registered User
Join Date: Mar 2005
Location: Shizuoka City, Japan
Posts: 9,652
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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.
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23-03-2012, 19:14
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#27 |
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Registered User
Join Date: Jun 2005
Location: N59° 37' / E17° 50' Marsta Sweden
Posts: 2,894
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Log this evning 34min. Fantastic strong signal stringth in start S9+40db =74dbuV. Sorry for bad audio from studio.
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26-03-2012, 20:14
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#28 |
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Registered User
Join Date: Sep 2006
Location: PARIS FRANCE
Posts: 403
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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 |
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26-03-2012, 20:28
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#29 |
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Registered User
Join Date: Mar 2010
Location: Northeast France
Posts: 351
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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.
__________________
DRM: Mixer Platine MF9 Mhz with Dream Antenna: Mantova Turbo 5/8 wave for 27 mhz Long Wire 80 meter |
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27-03-2012, 21:11
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#30 |
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Registered User
Join Date: Jun 2005
Location: N59° 37' / E17° 50' Marsta Sweden
Posts: 2,894
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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. |
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