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Old 25-07-2018, 19:29   #16
AF4MP
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China 6030 kHz reception near Beijing

Was listening to the 6030 kHz DRM transmission via the KiwiSDR web receiver in Cangzhou south of Beijing. The transmission ended just after 1800 UTC.

Attachment 1 - shows the received screen ID, and Attachment 2 shows the received data constellation.
Attached Images
File Type: png China 6030 Screen ID.png (9.6 KB, 39 views)
File Type: png China 6030 Cnstl.png (11.9 KB, 38 views)
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Old 25-07-2018, 22:01   #17
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Here's my unattended log from NZ last night.

My audio can be found on Dropbox for a while: https://bit.ly/2uRwNgR

Cheers, Chris
Attached Images
File Type: png 6030-180725-1038-1815-Owdjim.png (44.7 KB, 92 views)
File Type: gif 201807251300.gif (8.4 KB, 37 views)
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Elad FDM-DUOr, KiwiSDR, FRG-100/DRM receivers + Wellbrook ALA1530S+ loop antenna
http://www.owdjim.gen.nz/chris/radio/DRM/ http://kiwisdr.owdjim.gen.nz:8073

Last edited by Owdjim : 25-07-2018 at 22:13. Reason: Add link to audio
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Old 26-07-2018, 01:18   #18
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Quote:
Just tried out the very neat KiwiSDR TDoA direction finding feature on the China 6030 kHz transmitter.

Nice detective work! Considering the heavy multi-path character of propagation condition typical for this meter band.
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Any kind of audio drop-out is worse than any kind of low quality audio: No audio, No log report.

My Rx location: GuangXi Province @ E10636′ N2355′
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Old 26-07-2018, 12:42   #19
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Been away all day today. Now, at 1215 UTC the Gospell shows ???? in the display and so does the DR111. There is no decoded sound at all. More experimenting tomorrow.

I'm also in the midst of changing computers which add to the chores...
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Old 26-07-2018, 13:47   #20
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China 6030 kHz reception near Beijing

This morning, monitoring the Cangzhou KiwiSDR web RX, the transmission was running 64 QAM with 20.96 kbps bitrate and decoded audio bandwidth showing over 15 kHz.
Attached Images
File Type: png CR6030 64QAM ScreenID.png (8.0 KB, 89 views)
File Type: png CR6030 64QAM Audio Spect.png (6.9 KB, 81 views)
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Old 26-07-2018, 22:13   #21
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And with the higher rate provided 0% decoding Down Under.

Cheers, Chris
Attached Images
File Type: png 6030-180726-1227-1752-Owdjim.png (40.8 KB, 92 views)
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Elad FDM-DUOr, KiwiSDR, FRG-100/DRM receivers + Wellbrook ALA1530S+ loop antenna
http://www.owdjim.gen.nz/chris/radio/DRM/ http://kiwisdr.owdjim.gen.nz:8073
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Old 27-07-2018, 00:11   #22
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According to this Chinese blog https://cahcn.github.io/ using Google translation:

July 24, 2018, the second time in China's voice test launch DRM digital AM broadcast.

According to the official information, the frequency of the test is 6030kHz, the launch time is 04:25-02:05, and the original analog signal launch time.
during the test, Beijing time Tuesday 14:00-17:00 routine downtime maintenance.

6030KHZ original analog signal power of 100-kilowatt, and this year at the end of January, the first test launch of the same, DRM digital AM broadcast power only open 30-kilowatt.

Mainly for the North China launch, the Middle East part of China can receive signals. Downtime is not scheduled during testing, depending on the device's debugging or testing needs.

At the same time, the launch pad staff welcomed the conditions of enthusiasts to listen to and record the detailed reception information, to the official feedback listening effect, in order to improve the launch work.

Feedback Email:drmrtprc@163.com

Frequency Change (information continues to update during testing)
July 25 10:00 shutdown, 11:30 resumed launch.
July 26 09:00, modulation mode to 64QAM, is expected July 27 09:00 Restore the original mode.
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Old 27-07-2018, 23:03   #23
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New Zealand log for July 27. 14.56 kbps, but little audio decoded.

Cheers, Chris
Attached Images
File Type: png 6030-180727-1208-1800-Owdjim.png (43.0 KB, 31 views)
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http://www.owdjim.gen.nz/chris/radio/DRM/ http://kiwisdr.owdjim.gen.nz:8073
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Old 27-07-2018, 23:07   #24
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FYI, I've just received this email from the drmrtprc@163.com email in reply to my reception reports:

Quote:
Dear Chris,

Greetings from Beijing. Thank you for your attention.

Since 23rd Jul. test DRM on 6030 kHz became a regular test transmission. The schedule is 2025-1805 UTC. It is just a domestic broadcasting test. We will update the requirement into B18 HF broadcasting schedules. And in the test period, the normal AM transmission on 6030 kHz will be shut down.

In the near future, there may be more and more test DRM transmission. Look forward to your attention and feedback.
Please feel free to contact us.

Best regards.


Sincerely
Sun
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Elad FDM-DUOr, KiwiSDR, FRG-100/DRM receivers + Wellbrook ALA1530S+ loop antenna
http://www.owdjim.gen.nz/chris/radio/DRM/ http://kiwisdr.owdjim.gen.nz:8073
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Old 28-07-2018, 00:05   #25
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Yesterday at 0822 UTC (1722 JST) I received the Label and started the log. There is a gap between 1805 and 2015 UTC. I stopped the log at 2203 UTC. The attached log covers 0822-1805 UTC. Max. SNR was 13,25 dB at 1142 UTC and there was 3,32% decoded audio.

Note: Friday's date was "Sat Jul 28" in the Evaluation in DReaM. The clock was Bejing time, not UTC.
Attached Images
File Type: png 6030-180727-0822-1805-Terje@JPN.png (38.7 KB, 41 views)
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http://www.hobbyradio.se/en/drm/webp....index_en.html

Last edited by Digger : 28-07-2018 at 00:14.
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Old 28-07-2018, 19:38   #26
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China 6030 kHz KiwiSDR reception near San Francisco, CA

A very short log from a KiwiSDR web receiver south of San Francisco, CA, USA showing that there was some audio decoding this morning.
Attached Images
File Type: png 6030-180728-1308-1345-Zyg.png (40.2 KB, 34 views)
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Old 29-07-2018, 00:39   #27
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Perhaps the typhoon T12 blew the signal away last night? Anyway, poor receiving conditions in this two and a half hours long log.
Attached Images
File Type: png 6030-180728-1016-1249-Terje@JPN.png (35.8 KB, 35 views)
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Old 29-07-2018, 17:24   #28
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China 6030 kHz KiwiSDR reception Yokohama, Japan

Some of the KiwiSDR web receivers in Japan were receiving and decoding and others were not.

Here is today's log from Yokohama (only 1 hour permitted with that receiver).
Attached Images
File Type: png 6030-180729-1414-1514-Zyg.png (42.7 KB, 36 views)
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Old 30-07-2018, 03:04   #29
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Hi Zyg, seems like I have to do a little homework...

Here is my log from the 30th July. Three hours and 15% sound. Well...
Attached Images
File Type: png 6030-180730-0946-1248-Terje@JPN.png (43.6 KB, 28 views)
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http://www.hobbyradio.se/en/drm/webp....index_en.html

Last edited by Digger : 31-07-2018 at 07:55.
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Old 31-07-2018, 13:21   #30
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According to the Chinese calendar today was August 1st. Enclosed is my 147 minutes long log with 9,34% decoded audio. Max SNR was 16,28 dB at 12:08 UTC.
Attached Images
File Type: png 6030-180731-1023-1249-Terje@JPN.png (42.1 KB, 33 views)
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