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Old 12-06-2015, 22:42   #151
F1BJB
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Quote:
Originally Posted by Digger
@John: That is a utility TX. I have seen it too, but luckily, it is outside the DRM passband.
Same thing here.It is about 10dB weaker
Perfect reception this evening.
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Old 12-06-2015, 22:47   #152
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June_12

@ Terje: That is the utility TX when DRM has gone.
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Old 12-06-2015, 22:55   #153
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I was checking on 7550 kHz at about 17H50 and the IR was bad, no decoding. Then I turned to RRI 5910 kHz with bad results and after that to VON 15120 kHz with good results. Now I attached the logs of 7550 kHz at about 99.7% CDA for 171 mins.
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File Type: png 7550_150612_1939_mitajohn.png (25.7 KB, 147 views)
File Type: png 7550-150612-1939-2230-mitajohn.png (36.1 KB, 159 views)
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Last edited by mitajohn : 12-06-2015 at 23:00.
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Old 13-06-2015, 07:12   #154
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I was a bit late and started the log at 1754. The propagation was back to normal from the night before. 95.95% decoded audio during the 275 minutes util the end.


@John: Here is a screenshot of that utility from 7th May taken before 1730 UTC here in Stockholm, but that TX does not stray into the AIR DRM spectrum, so it is no problem here.
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File Type: png 7550-150612-1754-2229-Terje@SE.png (37.1 KB, 147 views)
File Type: jpg intruder7557 khz-before1730utc.jpg (49.4 KB, 165 views)
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Last edited by Digger : 13-06-2015 at 08:01.
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Old 14-06-2015, 08:43   #155
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Perfect reception.
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Old 14-06-2015, 22:44   #156
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June_14

~97% CDA for 286 mins with a weak period.
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File Type: png 7550_150614_1743_mitajohn.png (26.8 KB, 159 views)
File Type: png 7550-150614-1743-2229-mitajohn.png (37.1 KB, 161 views)
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Old 15-06-2015, 07:11   #157
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99.97% decoded audio for 289 minutes with no weak periods.
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Old 15-06-2015, 19:31   #158
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June_15

It started with bad IR, no decoding, no log, sometime the signal disappeared and AM took its place.
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Old 15-06-2015, 19:35   #159
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Perfect up here until the DRM broke down. A short burst, and then only AM on the frequency. I'll call it a day. 100% CDA until 1823 UTC.
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File Type: png 7550-150615-1739-1830-Terje@SE.png (35.7 KB, 175 views)
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Old 17-06-2015, 06:41   #160
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There were two short TX breaks around 1800 and 1802 UTC and the rest was perfect. The SNR was not so high, average was 19.71 dB
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File Type: png 7550-150616-1737-2229-Terje@SE.png (37.7 KB, 141 views)
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Old 17-06-2015, 22:46   #161
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A result at 99.7% CDA and 29.9 dB SNR.
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File Type: png 7550_150617_1803_mitajohn.png (25.8 KB, 157 views)
File Type: png 7550-150617-1803-2230-mitajohn.png (37.1 KB, 183 views)
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Old 18-06-2015, 06:01   #162
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I switched off early. A perfect log for 159 minutes. The SNR peaked at 1857 UTC with 24.74 dB
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File Type: png 7550-150617-1747-2025-Terje@SE.png (36.9 KB, 147 views)
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Old 18-06-2015, 21:27   #163
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My Log Plotter seems to have a problem with the DRM S/W Radio files :-(
The plotted audio seems to plot half the audio percent, but the 97% decoded audio is correct.

(I'll look into this ASAP)
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File Type: png 7550-150618-1721-2101-Terje@SE.png (30.8 KB, 137 views)
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Old 18-06-2015, 23:05   #164
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June_18

Only the results between the cursors are almost perfect at 99.93% CDA, the rest was bad. A the log start the IR was bad, turning better slowly and near the end Doppler increased.
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File Type: png 7550_150618_1939_mitajohn.png (27.1 KB, 135 views)
File Type: png 7550-150618-1939-2230-mitajohn.png (36.2 KB, 160 views)
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Old 19-06-2015, 22:46   #165
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Two weak periods, 280 mins log, 99.62% CDA.
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File Type: png 7550_150619_1749_mitajohn.png (25.4 KB, 155 views)
File Type: png 7550-150619-1749-2229-mitajohn.png (35.8 KB, 135 views)
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