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Old 10-08-2018, 17:06   #91
AF4MP
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WINB 15670 kHz Reception in Sardinia, Italy

VOACAP indicates that the WINB datacasting (plus sibling DRM broadcast) signal should be "stronger" along the Mediterranean Sea at around 1500Z.

Here are two logs from a KiwiSDR receiver using a good low noise antenna combo in Sardinia, Italy. The receiver auto-times out after 20 mins hence the two logs.

Sardinia is an island in the Mediterranean which, with its saltwater surrounding, would favour the WINB signal.

The first log shows that the longest drop-out free audio period is about 5 minutes.

The 2nd log shows that at 1529z the Nauen, Germany co-channel transmission of the AWR broadcast to Tibet commences causing severe interference to the WINB signal. The interfering program lasts 30 minutes, at which time Radio France International opens up their 500 kW transmitter on the same frequency and beaming south to Africa!

The Datacasting receivers in Europe probably use high-gain directional antennas with adequate front-to-back ratios that are not as affected by the interference.
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Old 13-08-2018, 12:54   #92
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The transmitter seems to be fixed, I've just had a snatch of their 15670 kHz signal at 1225 UTC.
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Old 13-08-2018, 18:39   #93
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Back On

Hi, WINB was on today. They will be off tomorrow as the power company is coming in to make some changes to the service. The station will also be putting in a replacement balun at this time.

The plan is to resume regular transmissions on Wednesday.
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Old 13-08-2018, 22:13   #94
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I got enough audio from them to finally send them a report, but I was intrigued at the 'shifted PSD' waveform in Dream, which just showed 'half' of the usual waveform, what is the reason for this I wonder?

I'll see if I can hear them on Wednesday, it would be nice to hear them when 'Unique Radio' is on if possible.
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Old 13-08-2018, 23:20   #95
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Quote:
Originally Posted by G4TMV
I was intrigued at the 'shifted PSD' waveform in Dream, which just showed 'half' of the usual waveform, what is the reason for this I wonder?

Start reading this thread at message number 33 for the answer to your question.
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Old 14-08-2018, 01:17   #96
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Quote:
Originally Posted by AF4MP
Start reading this thread at message number 33 for the answer to your question.


Thanks a lot for that Zyg, very interesting, I'd certainly not seen that used on Shortwave before, so at least I now understand what is going on. I normally use my modified NRD-525 with DRM decoder board, but I'll take a look at the waveform more closely on my SDR waterfall when I hear it again.

I've got a copy of the DRM handbook sitting on my Windows desktop, now I'm really going to make an effort to finally get around to reading it! :-)
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Old 14-08-2018, 14:34   #97
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Hi Alan,

With this WINB datacasting in mind, you might be interested in the following link which is Part 1 of a series of blogs describing the recent use of shortwave radio for high speed financial/commodities trading.

https://sniperinmahwah.wordpress.com...tower-mystery/
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Old 14-08-2018, 20:17   #98
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Very interesting! Do we know the content of the WINB datacast? Has someone been able to decode it?

OT: There was an "April Fool's article" regarding shortwave trading on the German site heise.de (look at the date/time: 01.04.2018, 01:04):
https://www.heise.de/newsticker/meld...k-4008891.html

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Old 16-08-2018, 17:48   #99
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WINB Programs

We'll be airing Unique Radio from 1100-1200 and AWR's Wavescan from 1630-1700 UTC on Friday August 17th on 15670 kHz.** Audio recording reception reports wanted either via Twitter @SWWINB or email winb40th@yahoo.com
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Old 17-08-2018, 21:06   #100
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Quote:
Originally Posted by AF4MP
Hi Alan,

With this WINB datacasting in mind, you might be interested in the following link which is Part 1 of a series of blogs describing the recent use of shortwave radio for high speed financial/commodities trading.

https://sniperinmahwah.wordpress.com...tower-mystery/

Hi Zyg,

Very interesting, thank you for that link. I guess there could be any number of interesting applications for the DRM mode if it ever took off in a major way, the more that stations can come up with such ideas the better.

Nothing heard from them today unfortunately, propagation seemed to be a bit down on 15 MHz, and my location just seems to be a bit too far north for propagation path it's using.
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Old 17-08-2018, 22:33   #101
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Hi Alan,

Although the WINB datacasting is half the bandwidth of its transmitted signal it is not actually part of the DRM transmission. The datacasting, interestingly, has not been publicly acknowledged by anybody representing the station. We only know about it by observing the transmitted spectrum and through some confusing information perused in the public files at the FCC.

DRM does have its own multi-mode system that can incorporate data amongst other services but that is not used here. This DRM signal has the capability at this time for only a 4kHz wide audio signal.

The FCC files show that the WINB transmitted power is 10 kW. That power is divided by datacasting and the DRM broadcast. Therefore the DRM signal power is only at 5 kW.

With the very low transmitter power and relatively poor audio quality this broadcast almost appears as if WINB has used DRM as a camouflage for the datacast!

The broadcast was predicted earlier in this thread to be poor or with no reception at all. Therefore it is not at all surprising that you were unable to receive the signal. None of the KiwiWeb receivers that I monitored along Europe's Atlantic coast today were able to receive a good signal.

By the way I am certainly not against shortwave datacasting, it is good to utilize the spectrum. I also am a passionate supporter of DRM. However I don't like obfuscation with broadcast information that is in the public domain.
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