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Сообщения - df6nm

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61
Markus joker)
2022-02-13 23:30 DF6NM 0.137536 -33 0 JN59nj    0.001    R2BAS KO85sv 1908 58 30
Sorry, my mistake. I had programmed my u-blox module to send FW-30, and at first connected the timepulse output directly to the antenna. Later I activated the PA and forgot to change the sequence. Then the radiated power was actually ~ 0.3 watts.
73, Markus

62
Received at DL0AO and DF6NM.

63
Remembering Nikolay, UA3DJG.

64
Strange, but no one decoded in FW2 (??)
Hi Alex, during that night I noticed that WSPR-2 decoded fine at DL0AO, whereas FW-2 was also visible in the waterfall but did not decode. I think the reason was the PC clock deviation due to the broken NTP correction on your side. I think that correct timing is much more critical for FST4 than for WSPR, and it is also less able to handle frequency drift.

73, Markus

65
June 5-6 Best QRB / reports R7NT acty
Hi Alex, my LF grabber was alive but had lost internet connection for a couple of nights. 11 spots from Sat/Sun have now been uploaded.  73, Markus

66
Nice signals from R7NT and RA3TTS at DL0AO.
73, Markus

67
Thanks Sergey for the friendly feedback. This afternoon, Bernd DF9RB went to the shack in the forest and restarted the PC. We are glad if the grabber is useful. On many evenings, and also today, the cardioid is pointing northeast, hoping to catch some signals from your part of the world.

Best 73,
Markus

 

68
It is a pity that the DL0AO grabber does not work
Yes we are aware of the problem, the grabber PC froze and we cannot reach it remotely. We intend to go to the site tomorrow and hope that we can fix it.
73, Markus


69
you were like IR3LW / 120

The map shows two labels, R3LW/120 on top of R3LW/1800. Same effect for "IRX3DHR".

73, Markus

70
We are very pleased to decode UA0AET at DL0AO and DF6NM in Bavaria. The FW30 signal was also well visible in the spectrogram https://vlf.u01.de/LF/LFgrabber/lf2_18UT.jpg

Unfortunately his frequency seems to be near the Chayka line on 137481.25 Hz, which may cause some interference, especially in eastern Europe. Also UA4AAV is sending exactly on another Chayka line, 137525.00 Hz.  Would it not be better to QSY a little bit (e.g. 1 Hz) to avoid this interference?

Best 73,
Markus

71
Saying goodbye to a friend.

72
Actually Riccardo, IW4DXW on 136172 Hz. Thanks for the screenshot Sergey!

73, Markus

73
RA3TTS at DL0AO.

74
UA3DJG SK
Oh no, this is very sad. His beautiful signal was here only a couple of weeks ago, it feels like yesterday. I can hardly believe it.

73, Markus

75
Another problem is that the Europeans "strangle" the distant reception of each other.
At DL0AO and DF6NM, we try to mitigate this problem using SpecLab's "frequency selective limiter" (FSL). In the FFT filter box, you can draw a red line about 20 dB above the noise level. The FSL will then limit all strong carriers to that level. The noise blanker should be installed after the FFT filter in the L4-L5 blackbox. The only disadvantage of this method is that the strong signal itself (e.g. DL0HOT) will be distorted, and the decoder will not show it's full SNR.

73, Markus

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