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Old 02-04-2019, 13:59   #1
PhilipOneL
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WINB 15120 kHz

The WINB DRM signal on 15120 kHz is quite strong right now (1350 UTC, Tues 2 April 2019) here in downtown St. John's, Newfoundland, as heard in AM mode on my Satellit 750. But propagation is highly variable this morning and it goes quiet often. When the signal is up, like now, the peculiar audio of an AM reading of WINB is there (the lower sideband filled with a seemingly multiplex hum, and the upper sideband with a characteristic DRM whoosh).

My MR27027 (+ 8m wire aerial) gives MER rates as high as 17 dB but with no audio decoding. However, mostly the MER rate is quite a lot lower, anywhere from zero up to 10 dB.

My Avion AV-DR-1401 (with a Sony AN LP1 loop antenna) has been registering lower MER rates, often zero when the AM-heard signal is quite loud on the Sat 750.
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Old 02-04-2019, 14:32   #2
AF4MP
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Hi Philip,

At what MER does your Avion start decoding audio on a) 64-QAM and b) 16-QAM transmissions?
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Old 02-04-2019, 16:35   #3
mitajohn
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April_02

I got some audio fragments and the label.
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File Type: png 15120_20190402_mitajohn_LBL.png (6.0 KB, 89 views)
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Old 03-04-2019, 17:02   #4
FritzWue
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Signal was too weak for any audio here today.
When Voice of Nigeria switched on at 15:58 UTC their intermodulation at +/-30 kHz was still as strong as the WINB signal.
Screenshots taken short before and after 16:00 UTC.
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File Type: png 15120_190403_1547_DK6QI.png (29.3 KB, 79 views)
File Type: png 15120_190403_1600_DK6QI.png (25.2 KB, 84 views)
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Last edited by FritzWue : 03-04-2019 at 17:57.
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Old 03-04-2019, 19:12   #5
AF4MP
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Quote:
Originally Posted by FritzWue
When Voice of Nigeria switched on at 15:58 UTC their intermodulation at +/-30 kHz was still as strong as the WINB signal.
So WINB goes to all this trouble to have a combo data signal, presumably to avoid the added latency if it were to be carried in the DRM signal, and here comes VoN and knocks it all out!

On top of that WINB knew that they were transmitting on VoN's frequency.

All very strange.
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Old 03-04-2019, 20:17   #6
FritzWue
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Quote:
Originally Posted by AF4MP
..... and here comes VoN and knocks it all out!
On top of that WINB knew that they were transmitting on VoN's frequency.
All very strange.

VoN's transmitting times are not very reliable, often the signal is missing.
Today again they had intermittend transmitter failure.
So WINB still has a chance to come trough now and then.
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Old 04-04-2019, 13:20   #7
PhilipOneL
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Quote:
Originally Posted by AF4MP
At what MER does your Avion start decoding audio on a) 64-QAM and b) 16-QAM transmissions?

To be honest, I don't know. I haven't been paying attention to 64- vs 16-QAM modes. Sometimes the Avion decodes at around 10 dB but other times it won't even at 16 dB.
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Old 11-09-2019, 17:02   #8
G4TMV
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Better reception here today, and no sign of Voice of Nigeria, so it stayed on right up to 1700 UTC this time. Some drop outs, but it was generally around the 10 - 12db SNR mark, so was getting some audio at least.
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Old 08-10-2019, 06:27   #9
MARCEL
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Ysterday afternoon October 7.2019 I receive WINB of 15120 Khz :

https://nsa40.casimages.com/img/2019...2838910238.jpg
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Old 09-10-2019, 14:46   #10
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WINB 15120 kHz

A little audio decoding with the short skip reception this morning (back of the beam).
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Old 10-10-2019, 22:54   #11
AF4MP
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WINB 15120 kHz

This morning's short skip reception (back of the beam) - 21.39% decoded audio, 17.14 dB max SNR.
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File Type: png 15120-191010-1326-1657-Zyg.png (36.8 KB, 5 views)
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Old 17-10-2019, 22:45   #12
AF4MP
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WINB 15120 kHz

This morning's short skip reception (back of the beam) - 2.16% decoded audio, 16.35 dB max SNR.
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