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| Subject: | LF: Re[2]: VLF: Tonite... |
| From: | Alex K <[email protected]> |
| Date: | Fri, 10 Mar 2017 18:21:47 +0300 |
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| Cc: | DK7FC <[email protected]> |
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Hello Stefan, VLF! Yes! Optimization of my receiving system yielded positive takes. Both 8-ch transmissions were successfully and quite easily decoded. It is interesting that for transmission of March 07 of 22:30 best decode achiewed with small freq offset. Without this offset was also successful decode but with smaller Eb/N0. On reception only E-probe was used. I found that this setup, without Loop-ant, gives the best SNR in my environment. Grabber is running and my next visit will at Monday. Congrats to Stefan on his 8-char successful transmissions! As usualy files are here: http://rn3aus.narod.ru/ebnaut-vlf-7-9mar2017.zip ebnaut-rx V0.5 input file C:\EbNaut\ebnaut08_MAR_0448_8270-1pps.wav sample rate 0.342935 per second rx frequency 8270.1 file start time 2017-03-07 22:10:11.190 polynomial 16K21A crc size 16 number of chars 8 block size 64 symbol period 30.000 number of symbols 1344 list length 200000 start offset 600.774 freq offset 0.000009 cores 2 skipped 600.696925 seconds to start initial reference phase 19.0 --------------------------------------------- found CONGRATS list rank 12 reference phase 30 30 30 30 carrier RMS 1.213e-004 noise RMS 1.783e-005 carrier S/N 16.65 dB in 24.8 uHz carrier Es/N0 -14.63 dB carrier Eb/N0 0.06 dB info bit period 884.21 seconds symbol error rate 532/1344 = 39.583 % Es/N0 from symbol errors -14.5 dB Eb/N0 from symbol errors 0.2 dB Shannon capacity 5.9 bits/hour Shannon efficiency 69.5 % symbols file C:\EbNaut\ebnaut08_MAR_0448_8270-1pps-symbols.csv elapsed 20 seconds ebnaut-rx V0.5 input file C:\EbNaut\ebnaut09_MAR_2248_8270-1pps.wav sample rate 0.342935 per second rx frequency 8270.1 file start time 2017-03-09 16:10:11.190 polynomial 16K21A crc size 16 number of chars 8 block size 64 symbol period 30.000 number of symbols 1344 list length 200000 start offset 6600.774 freq offset 0.000000 cores 1 skipped 6601.834167 seconds to start initial reference phase 33.2 --------------------------------------------- found GOOD DAY list rank 0 reference phase 0 0 0 0 carrier RMS 1.397e-004 noise RMS 1.888e-005 carrier S/N 17.39 dB in 24.8 uHz carrier Es/N0 -13.90 dB carrier Eb/N0 0.80 dB info bit period 884.21 seconds symbol error rate 546/1344 = 40.625 % Es/N0 from symbol errors -15.5 dB Eb/N0 from symbol errors -0.8 dB Shannon capacity 6.9 bits/hour Shannon efficiency 58.9 % symbols file C:\EbNaut\ebnaut09_MAR_2248_8270-1pps-symbols.csv elapsed 11 seconds Пятница, 10 марта 2017, 16:59 +03:00 от Paul Nicholson <[email protected]>:
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