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Old 30-04-2015, 19:28   #15
Digger
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Join Date: Mar 2005
Location: Shizuoka City, Japan
Posts: 9,830
30th April ended with a flop

Hi all,

So far (until 1822 UTC) it seems to me that they have either forgotten to plug in the audio source(s) or the propagation is down the drain. SDC is red and MSC is gray. The RF signal received here is around S9+20 dB which in my case means an input level of +58 dBuV which is more than 0.5 mV into the antenna socket.

The SNR was around 5 dB until 2115 UTC when, after a few breaks in the DRM transmission, the SNR suddenly rose to more than 20 dB and the labels appeared. The bitrate was 11.72 kbps on both channels. Propagation wasn't good and the CIR was flat. At 2125 UTC I noted the comment "Non-stop Express", which seems to be a music programme with light native popular music.

They used Mode A for this transmission, but the P3/0 was not robust enough. What they were up to from 1752 until 2115 I have no idea. Probably they had managed to have chosen a bad DRM configuration.

If this was the last transmission in the test, it was a disappointment. We just have to wait for the next test.
Attached Images
File Type: png 7550-150430-1752-2230-Terje@SE.png (39.6 KB, 984 views)
File Type: png 7550-150430-2114-2230-Terje@SE.png (42.9 KB, 944 views)
__________________
Regards,
Terje

https://www.hobbyradio.se/en/drm/web....index_en.html

Last edited by Digger : 01-05-2015 at 09:27.
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