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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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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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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, 12:13   #7
AF4MP
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Quote:
Originally Posted by FritzWue
So WINB still has a chance to come trough now and then.

Yes, although WINB is not exactly a stellar performer.
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Old 04-04-2019, 13:20   #8
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 04-04-2019, 17:19   #9
tpreitzel
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Quote:
Originally Posted by FritzWue
VoN's transmitting times are not very reliable, often the signal is missing.

Right ... which is why WINB really should use a different frequency. I fully understand the frustration of dealing with an erratic broadcaster like VoN, but a different frequency should be used by WINB regardless.
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Old 09-04-2019, 16:41   #10
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No audio even with 5 kHz filter.
Reception stopped when VoN switched on.
Red Lion is not yet in the TX site list on this frequency.
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Old 11-04-2019, 14:30   #11
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A little of WINB appeared on my logger this morning...

Correction: Since it is a 10 kHz bandwidth the signal is probably Voice of Nigeria and not WINB.
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Last edited by AF4MP : 13-04-2019 at 17:36.
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Old 12-04-2019, 14:25   #12
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Some more WINB this morning...

Correction: Since it is a 10 kHz bandwidth the signal is probably Voice of Nigeria and not WINB.
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Last edited by AF4MP : 13-04-2019 at 17:36.
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Old 12-04-2019, 14:41   #13
FritzWue
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No audio with or without Kuwait on 15110 kHz.
Log started after Kuwait shut down.
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Old 15-04-2019, 19:11   #14
FritzWue
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Only 2% audio
I missed when VoN switched on, so with my special filter settings for WINB's strange modulation the snr was higher, but no demodulation possible.
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Old 19-04-2019, 15:35   #15
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Frequency: +
Modulation: -
Codec: -
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