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Old 06-10-2010, 02:33   #16
RafaelColDRM
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Hi all

This tonight with excellent signal on 12110 Khz from 0000, with RFI in french and spanish, after 0200 with Radio Taiwan Internacional in spanish. I was received images. You can see and more about this transmission on my DX blog

Please visit
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Old 06-10-2010, 04:07   #17
PP5AZF-Ataliba
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TDF in São José City (GG52QK)
Attached Images
File Type: png 12110-101006-0302-0357-PP5AZF.png (41.4 KB, 133 views)
File Type: png TDF-12110-20101006-0351.PNG (72.1 KB, 122 views)
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Old 06-10-2010, 04:35   #18
Brendan1
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12110 from TDF Montsinery 6 Oct

This broadcast did not go as well as 17650. It began just one hour before local sunset (0100), and so got caught up in the grayline and shifting ionospheric layers. It did not get better until well after 0200, and then was not all that steady. I'd have suggested using the 31 meter band for this time slot, but oh well...
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File Type: png 12110-101006-0001-0357-Brendan1.png (46.8 KB, 119 views)
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Old 06-10-2010, 18:18   #19
AF4MP
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For those interested, the TDF Montsinery 17650 kHz signal is expected to gradually shift away from the US east coast from 22:00 to 23:00 UTC.

The VOACAP predicted signal strength footprint (assuming TDF is beaming directly towards Mexico City) is shown in the two attached plots.

The signal propagation is forecast to continue that shift for the rest of the evening transmission.
Attached Images
File Type: png MNMX1722.PNG (88.8 KB, 122 views)
File Type: png MNMX1723.PNG (85.8 KB, 124 views)
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-Zyg- AF4MP
34°02' N, 84°24' W
EM74ta

Last edited by AF4MP : 06-10-2010 at 18:25.
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Old 06-10-2010, 21:04   #20
stef
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some seconds decoding,i think the tx was failing at end of log
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File Type: png 17650_101006_1924_your_username.png (29.6 KB, 128 views)
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Old 06-10-2010, 21:34   #21
FritzWue
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After a good late start something happened in the ionosphere and the propagation conditions were gone. This was the same for CVC from Chile on 17640 kHz, which usually is around S9 and was 20 dB weaker this evening. So the results at 14 kbps tonight are not comparable with yesterdays reception when propagation was good. DRM ended short before 21:00 UTC and the following short AM was 100% readable.

We can compare average SNR and CDA for the three different bitrates during the same time interval 19:20 to 20:48 UTC:

kbps_____Avg.SNR_____CDA
20.96______14.7______17.46
17.00______18.4______34.41
14.56______12.2______19.79

I wonder what tonight's CDA might have been at yesterday's 18.4 dB avg. SNR!
A very interesting test!
Attached Images
File Type: png 17650_101006_1901_DK6QI.png (35.2 KB, 113 views)
File Type: png 17650_101006_1901a_DK6QI.png (43.9 KB, 103 views)
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Last edited by FritzWue : 06-10-2010 at 21:45.
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Old 06-10-2010, 23:22   #22
Brendan1
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6 Oct log

Reception was very, very good until 2220 when it appears they shut down. Also had three distinct transmitter off-air periods, when it seems that analog AM was broadcast for comparison purposes (DRM-NA listserve reports). As you can see, signal strength and decoding were both excellent during the on-air periods.
Attached Images
File Type: png 17650-101006-1902-2220-Brendan1.png (40.9 KB, 110 views)
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Old 07-10-2010, 00:15   #23
AF4MP
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TDF Montsinery to Mexico 17650 kHz reception near Atlanta, Georgia, USA

Apart from the transmission breaks, etc., the best reception was between 20:00 and 21:00 hours.
Attached Images
File Type: png 17650-101006-1906-2349-AF4MP.png (44.5 KB, 112 views)
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-Zyg- AF4MP
34°02' N, 84°24' W
EM74ta

Last edited by AF4MP : 07-10-2010 at 12:11. Reason: corrected transmitter distance error on chart
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Old 07-10-2010, 03:51   #24
PP5AZF-Ataliba
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CVC 17.640 and TDF 17.650 - simultaneously

Duas emissoras lado a lado, sem espaço separando no espectro entre elas. Aliás, ou a frequencia de referência da CVC (17.640 khz) estava 0.5 Khz acima ou da TDF (17.650 khz) estava 0.5 khz abaixo. Somando a largura de banda total das duas rádios ficou igual a 19,5 khz onde deveria ser 20 khz.
O resultado foi que uma emissora interferiu no espectro da outra em pelo menos 500 khz.

Two stations side by side with no space separating the spectrum between them. Moreover, the frequency reference or CVC (17,640 kHz) was above 0.5 kHz or TDF (17 650 kHz) was below 0.5 kHz. Adding to the total bandwidth of the two radios was equal to 19.5 khz where it should be 20 kHz.
The result was a station that interfered with the other spectrum in at least 500 kHz.
Attached Images
File Type: png CVC-17640-TDF-17650-20101006-1937.PNG (70.5 KB, 136 views)
File Type: png CVC-17640-TDF-17650-20101006-1929.PNG (68.8 KB, 133 views)
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Plataforma Brasileira do Digital Radio Mondiale
www.drm-brasil.org

ABRADIG - Associação Brasileira de Radio Digital
www.abradig.org.br

Amostras de áudio de algumas rádios DRM:
www.zandomenego.com/ataliba/drm

Youtube channel:
www.youtube.com/atalibazf
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