Congratulations Jay and Stefan, and thanks Markus for the perspectives and reference points. I have a rough recollection of Stefan’s estimated ERP, which would seem to slightly more than offset a nominal E-W/W-E attenuation ratio, making Markus’ two propagation observations particularly interesting, as is the Forest question. Fine work Stefan and Jay. 73, Jim AA5BW From: [email protected] [mailto:[email protected]] On Behalf Of Markus Vester Sent: Sunday, February 25, 2018 2:25 PM To: [email protected] Subject: Re: LF: VLF DK7FC > W1VD 8.27 kHz EbNaut more success! Hi Jay, Stefan,
really good work, truly amazing!
Noticing that Stefan hadn't sent another repeat last night 24/25th, I wondered whether the experiment might have already been concluded successfully - yes it had ;-)
Considering that Joe has been making the TA W-E path with only 10 uW, in retrospective it seems not so surprising that Stefan's much stronger signal managed to overcome the E-W nonreciprocity. On the other hand, when Uwe had sent a very long carrier in March 2014, no conclusive trace was ever detected in Virginia. Now I wonder whether Stefan's recent transmission has also been picked up in Forest?
All the best, Markus (DF6NM)
-----Ursprüngliche Mitteilung----- Von: jrusgrove <[email protected]> An: ([email protected]) <[email protected]> Verschickt: So, 25. Feb 2018 19:26 Betreff: LF: VLF DK7FC > W1VD 8.27 kHz EbNaut more success!
f = 8270.1000 Hz Start time: 19.FEB.2018 22:30:00 UTC (daily) Symbol period: 30 s Characters: 2 CRC bits: 22 Coding 16K21A Duration: 07:12 [hh:mm] Antenna current: 700 mA After a successful one character reception earlier in the week, we can now report the successful reception of a 2 character message. Stacking of 3 transmissions was required (0221, 0222 and 0223). There is also a 0224 file but it has timing issues and may or may not be usable. ebnaut-rx V0.8 input file C:\EbNaut\DK7FC\sum212223.wav sample rate 0.457240 per second rx frequency 8270 file start time 2018-02-22 22:21:17.790 polynomial 16K21A crc size 22 number of chars 2 block size 34 symbol period 30.000 number of symbols 864 start offset 537.000 freq offset 0.100000 cores 2 list length 500000 skipped 538.011261 seconds to start initial reference phase 30.6 --------------------------------------------- found DX list rank 48426 reference phase 150,150,150,150 carrier S/N 11.04 dB in 38.6 uHz, -33.10 dB in 1Hz, -67.08 dB in 2.5kHz carrier Es/N0 -18.33 dB carrier Eb/N0 0.47 dB info bit period 2273.68 seconds symbol error rate 373/864 = 43.171 % Es/N0 from symbol errors -18.2 dB Eb/N0 from symbol errors 0.6 dB Shannon capacity 2.5 bits/hour Shannon efficiency 62.7 % symbols file C:\EbNaut\DK7FC\sum212223-symbols.csv elapsed 52 seconds --------------------------------------------- found DX list rank 17074 reference phase 120,150,120,150 carrier S/N 11.19 dB in 38.6 uHz, -32.94 dB in 1Hz, -66.92 dB in 2.5kHz carrier Es/N0 -18.17 dB carrier Eb/N0 0.62 dB info bit period 2273.68 seconds symbol error rate 374/864 = 43.287 % Es/N0 from symbol errors -18.4 dB Eb/N0 from symbol errors 0.4 dB Shannon capacity 2.6 bits/hour Shannon efficiency 60.5 % symbols file C:\EbNaut\DK7FC\sum212223-symbols.csv elapsed 383 seconds |
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