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| To: | [email protected] |
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| Subject: | Re: VLF: EbNaut on 6470.1 Hz |
| From: | Markus Vester <[email protected]> |
| Date: | Fri, 14 Apr 2017 02:27:11 -0400 |
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The transmission was decoded from DL0AO data (well, just!): ebnaut-rx V0.5 input file dl0ao_04140130.wav sample rate 0.514393 per second rx frequency 6470 file start time 2017-04-13 21:05:19.620 polynomial 16K21A crc size 18 number of chars 2 block size 30 symbol period 36.000 number of symbols 800 list length 200000 start offset 3288.000 freq offset 0.100000 cores 2 skipped 3287.372330 seconds to start padded 235.229 seconds at end initial reference phase -77.0 --------------------------------------------- ..... found xx list rank 25047 reference phase 120 150 150 180 carrier RMS 5.550e-005 noise RMS 1.627e-005 carrier S/N 10.66 dB in 34.7 uHz carrier Es/N0 -18.37 dB carrier Eb/N0 0.09 dB info bit period 2526.32 seconds symbol error rate 367/800 = 45.875 % Es/N0 from symbol errors -20.0 dB Eb/N0 from symbol errors -1.5 dB Shannon capacity 2.1 bits/hour Shannon efficiency 68.4 % symbols file dl0ao_04140130-symbols.csv elapsed 988 seconds Hint: The message content is similar but not identical that from March 29/30. Best 73,
Markus (DF6NM) -----Ursprüngliche Mitteilung----- Von: DK7FC <[email protected]> An: rsgb_lf_group <[email protected]> Verschickt: Do, 13. Apr 2017 23:53 Betreff: VLF: EbNaut on 6470.1 Hz
VLF,
OK, there are still some improvements to do on the new system but now these 8 stacks (8 x 33 T106-52 cores inside the field, they have a weight of 8.13 kg!) are inside the field. The actual resonance frequency is 20 Hz down but that's OK for tonite. At least the antenna current stays at 460 mA for tonite. Let's try a first EbNaut message on 6.47 kHz (not the first for Paul and me but for Eddie and maybe Jacek...): f = 6470.100000 Hz Start time: 13.Apr.2017 22:00:00 UTC Symbol period: 36 s Characters: 2 CRC bits: 18 Coding 16K21A Duration: 8h Antenna current: 460 mA 73, Stefan |
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