To: | [email protected], [email protected] |
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Subject: | LF: IW4DXW 3-char ebnaut 8270.00332 Hz recvd nr Moscow |
From: | Alex K <[email protected]> |
Date: | Wed, 20 Dec 2017 17:10:40 +0300 |
Cc: | [email protected] |
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Reply-to: | [email protected] |
Sender: | [email protected] |
Hello Riccardo, VLF!
Looks like I have something! After weighted stacking of 3 nights of 3 char transmissions EbNaut software produce decode : ebnaut-rx V0.7a input file C:\EbNaut\IW4DXW\sum3charweighted.wav sample rate 0.342935 per second rx frequency 8270.1 file start time 2017-12-16 20:32:19.690 polynomial 16K21A crc size 24 number of chars 3 block size 42 symbol period 30.000 number of symbols 992 list length 20000000 start offset 3472.274 freq offset -0.096681 cores 1 skipped 3472.961348 seconds to start initial reference phase 28.1 --------------------------------------------- found QSY list rank 14946658 reference phase -150 -150 -150 -150 carrier S/N 10.41 dB in 33.6 uHz, -34.33 dB in 1Hz, -68.31 dB in 2.5kHz carrier Es/N0 -19.56 dB carrier Eb/N0 -1.92 dB info bit period 1740.35 seconds symbol error rate 428/992 = 43.145 % Es/N0 from symbol errors -18.2 dB Eb/N0 from symbol errors -0.6 dB Shannon capacity 1.9 bits/hour Shannon efficiency 108.5 % symbols file C:\EbNaut\IW4DXW\sum3charweighted-symbols.csv elapsed 1396 seconds ------------------- Maybe this decode is true? Files for reprocessing: http://rn3aus.narod.ru/IW4DXW-3char.zip PS: stacking of 2-char transmissions give me decode "JA". And also many other decodes like "46", "2+"... 73 de Rn3aus / Alex Воскресенье, 17 декабря 2017, 0:31 +03:00 от Riccardo Zoli <[email protected]>: Hi VLF, I'm ready for another transmission: f = 8270.00332 Hz Start time: 21:30:00 UTC Symbol period: 30 s Characters: 3 (repeated) CRC bits: 24 Coding 16K21A Duration: 8h,16min Antenna current: 395 mA ...thanks again for reports. All the best 73 de Riccardo IW4DXW
IW4DXW-3char-QSY.png |
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