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Old 26-05-2008, 09:24   #1
mitajohn
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BNR Digital on 11900 kHz.

Hi all,

BNR is now on 11900 kHz, I will add a log later.

EDIT: Log added: Out of the target area so bad results, but the signal reached up to ~50 dBuV with deep (~30 db) fading, good sound.
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File Type: png 11900_080526_lbl.png (4.7 KB, 568 views)
File Type: png 11900-080526-0910-1000-mitajohn.png (39.7 KB, 505 views)
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Last edited by mitajohn : 26-05-2008 at 13:52.
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Old 26-05-2008, 11:44   #2
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Bad results here too. Max SNR is 13 dB.

Edit: Log of the last minutes added.
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Last edited by drmdab : 26-05-2008 at 12:02.
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Old 26-05-2008, 11:56   #3
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BNR low signal stringth and 23,20kbps !!!!!!! very bad .
And very strong AM on 11895 and 11905 .
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File Type: jpg 11900.jpg (26.4 KB, 493 views)
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Old 26-05-2008, 12:59   #4
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Mixed results here too. Why use such a high bit rate for a Mono transmission? Some QRM from an AM TX 5 kHz down. The signal was quite weak sometimes causing the audio dropouts. Max. SNR was >26 dB in the very last minute of the log.
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Old 27-05-2008, 11:44   #5
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A seldom seen DRM configuration this morning. 9 kHz and 18.06 kbps instead of yesterday's 23.2 kbps. Good decoding after some audio problems with low level and a "pumping" sound during the first few minutes. After 10:15 reception deteriorated and when I switched off I noticed a terrible racket caused by a defective (?) AM TX on 11.935 MHz which covered more or less the whole 25 m band.
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File Type: png 11900-080527-0900-1121-HED362.png (42.1 KB, 479 views)
File Type: jpg 11935qrm.jpg (19.2 KB, 509 views)
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Old 27-05-2008, 18:19   #6
mitajohn
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Hi all,

A short log today but with much better results. Stable signal, lower BR and BW.
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File Type: png 11900_080527_0941_mitajohn.png (25.9 KB, 480 views)
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Old 28-05-2008, 10:59   #7
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Hi all.

Very good today for 18,06 kbps and BW 9Khz. Log is 60min.
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Old 28-05-2008, 11:06   #8
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If somebody would think of solving the problem with the AM (?) TX on 11.935 MHz that spews noise and hum hundreds of kHz around, then my BNR log would have looked even better.
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File Type: png 11900-080528-0917-1100-HED362.png (39.7 KB, 414 views)
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Old 29-05-2008, 12:10   #9
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A much better result today. SNR peaked at >29 dB at 10:57 UTC.
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Old 29-05-2008, 12:20   #10
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Hi all,

A problematic result with some good and bad periods, fast and deep fading, less than 600km close to the TX site and out of the target area.
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Last edited by mitajohn : 29-05-2008 at 12:23.
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Old 29-05-2008, 15:52   #11
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Some chatter from a utilities monitoring group I belong to indicates that the bad transmitter on 11935 was probably a BSKSA (Saudi) system going bad. It was noted with spurs and horrific audio from 11910 to 12150kHz, and is now off-air. They noted it for at least the last two days, which coincides with the start of BNR.
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Old 30-05-2008, 12:03   #12
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@Brendan: As for Saudi that is correct. But I doubt anyone down there cares at all.

Just for comparison, the same TX on 15.435 MHz produced a wall-to-wall racket from 14.580 MHz to 16.150 MHz (!) yesterday afternoon.

Anyway, good reception on 11900 kHz this morning, only some minor decoding problems around 10 UT. I stopped the log after that. I am a bit unfamiliar with the language
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Old 30-05-2008, 12:57   #13
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May 30

Hi all,

An unattended log. I left the log running and here are the results, bad results after 09:45.

@ Brendan & Digger: I noticed that also here, trying to receive biteXpress on 15896 kHz.
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File Type: png 11900_080530_0839_mitajohn.png (29.4 KB, 491 views)
File Type: png 11900-080530-0839-1108-mitajohn.png (39.0 KB, 481 views)
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Old 30-05-2008, 14:37   #14
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Same here yesterday in the northwest of germany from 21m - 16 MHz. And almost no chance to get any station in these bands.

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Old 30-05-2008, 15:47   #15
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Hi all.

Log her is 69min. And signal stringth was very good only fast Fading 5 times .

BW of 9Khz is very good , carrier from AM+ /- 5 Khz come not in DRM specterum .

I have only small splatter from QRM Tx on 11935 for low signal stringth S7 .
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File Type: jpg 11900.jpg (36.6 KB, 478 views)
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