Re: LF: Re[2]: VLF: New carrier on 6470.005 Hz

[DK7FC <selberdenken@posteo.de>]

Hi Alex and Eddie,

Unfortunately the messages are not correct. With just 2 characters it is hard to decide if the message makes sense. We seem to be very close (beyond) the limit.
But hey we are far from doing trivial things, and it was one of the first attempts. So let's just try a few more.
Your 47 uHz spectrograms show some encouraging traces.
Alex i can see on your 47 uHz spectrogram that the QRN is now rising. That makes it even harder. But the days become shorter again in just 2 months! ;-)
>From Paul's measurements it looks like the band preferrs day time transmissions, at least in a range below 1000 km. Maybe this could even work on the way to Moscow?

I should try a long transmission of a short message during daytime:

f = 6470.100000 Hz
Start time: 22.Apr.2017   07:00:00 UTC
Symbol period: 40 s
Characters: 2
CRC bits: 32
Coding 16K21A
Duration: 11h, 22m, 40s
Antenna current: 460 mA


73, Stefan



Am 21.04.2017 18:07, schrieb Alex K:

Hello VLF, Stefan!
My "list of (false?) decodes":
ebnaut-rx V0.5
input file C:\TEMP\ebnaut20_APR_0123_6470-1pps.wav
sample rate 0.342935 per second
rx frequency 6470.1
file start time 2017-04-19 18:45:28.390
polynomial 16K21A
crc size 20
number of chars 2
block size 32
symbol period 30.000
number of symbols 832
list length 2000000
start offset 883.574
freq offset 0.000009
cores 3
skipped 883.549361 seconds to start
initial reference phase 32.7
---------------------------------------------
found NC
list rank 418701
reference phase    0    0    0    0
carrier RMS 4.857e-005 noise RMS 1.716e-005
carrier S/N 9.03 dB in 40.1 uHz
carrier Es/N0 -20.17 dB
carrier Eb/N0 -1.53 dB
info bit period 2189.47 seconds
symbol error rate 366/832 = 43.990 %
Es/N0 from symbol errors -19.4 dB
Eb/N0 from symbol errors -0.8 dB
Shannon capacity 1.7 bits/hour
Shannon efficiency 99.2 %
symbols file C:\TEMP\ebnaut20_APR_0123_6470-1pps-symbols.csv
elapsed 11 seconds
---------------------------------------------
found WH
list rank 452770
reference phase  180  180  180  180
carrier RMS 5.105e-005 noise RMS 1.716e-005
carrier S/N 9.47 dB in 40.1 uHz
carrier Es/N0 -19.73 dB
carrier Eb/N0 -1.10 dB
info bit period 2189.47 seconds
symbol error rate 370/832 = 44.471 %
Es/N0 from symbol errors -20.0 dB
Eb/N0 from symbol errors -1.4 dB
Shannon capacity 1.8 bits/hour
Shannon efficiency 89.8 %
symbols file C:\TEMP\ebnaut20_APR_0123_6470-1pps-symbols.csv
elapsed 21 seconds
---------------------------------------------
found BE
list rank 219161
reference phase   60   60   60   60
carrier RMS 5.119e-005 noise RMS 1.716e-005
carrier S/N 9.49 dB in 40.1 uHz
carrier Es/N0 -19.71 dB
carrier Eb/N0 -1.08 dB
info bit period 2189.47 seconds
symbol error rate 373/832 = 44.832 %
Es/N0 from symbol errors -20.0 dB
Eb/N0 from symbol errors -1.4 dB
Shannon capacity 1.8 bits/hour
Shannon efficiency 89.3 %
symbols file C:\TEMP\ebnaut20_APR_0123_6470-1pps-symbols.csv
elapsed 65 seconds
---------------------------------------------
found V-
list rank 232072
reference phase   30   30    0    0
carrier RMS 5.150e-005 noise RMS 1.716e-005
carrier S/N 9.54 dB in 40.1 uHz
carrier Es/N0 -19.66 dB
carrier Eb/N0 -1.02 dB
info bit period 2189.47 seconds
symbol error rate 374/832 = 44.952 %
Es/N0 from symbol errors -20.0 dB
Eb/N0 from symbol errors -1.4 dB
Shannon capacity 1.9 bits/hour
Shannon efficiency 88.2 %
symbols file C:\TEMP\ebnaut20_APR_0123_6470-1pps-symbols.csv
elapsed 113 seconds
---------------------------------------------
found WH
list rank 200539
reference phase -150 -150  180  180
carrier RMS 5.386e-005 noise RMS 1.716e-005
carrier S/N 9.93 dB in 40.1 uHz
carrier Es/N0 -19.27 dB
carrier Eb/N0 -0.64 dB
info bit period 2189.47 seconds
symbol error rate 366/832 = 43.990 %
Es/N0 from symbol errors -19.4 dB
Eb/N0 from symbol errors -0.8 dB
Shannon capacity 2.0 bits/hour
Shannon efficiency 80.7 %
symbols file C:\TEMP\ebnaut20_APR_0123_6470-1pps-symbols.csv
elapsed 121 seconds
---------------------------------------------
found BE
list rank 114596
reference phase   60   60   30   30
carrier RMS 5.345e-005 noise RMS 1.716e-005
carrier S/N 9.87 dB in 40.1 uHz
carrier Es/N0 -19.33 dB
carrier Eb/N0 -0.70 dB
info bit period 2189.47 seconds
symbol error rate 361/832 = 43.389 %
Es/N0 from symbol errors -18.5 dB
Eb/N0 from symbol errors 0.1 dB
Shannon capacity 2.0 bits/hour
Shannon efficiency 82.0 %
symbols file C:\TEMP\ebnaut20_APR_0123_6470-1pps-symbols.csv
elapsed 127 seconds
---------------------------------------------
found WH
list rank 106975
reference phase  180 -150  180 -150
carrier RMS 5.378e-005 noise RMS 1.716e-005
carrier S/N 9.92 dB in 40.1 uHz
carrier Es/N0 -19.28 dB
carrier Eb/N0 -0.65 dB
info bit period 2189.47 seconds
symbol error rate 368/832 = 44.231 %
Es/N0 from symbol errors -19.7 dB
Eb/N0 from symbol errors -1.1 dB
Shannon capacity 2.0 bits/hour
Shannon efficiency 80.9 %
symbols file C:\TEMP\ebnaut20_APR_0123_6470-1pps-symbols.csv
elapsed 470 seconds
---------------------------------------------
found WH
list rank 137768
reference phase  180 -150  150  180
carrier RMS 5.485e-005 noise RMS 1.716e-005
carrier S/N 10.09 dB in 40.1 uHz
carrier Es/N0 -19.11 dB
carrier Eb/N0 -0.48 dB
info bit period 2189.47 seconds
symbol error rate 372/832 = 44.712 %
Es/N0 from symbol errors -20.0 dB
Eb/N0 from symbol errors -1.4 dB
Shannon capacity 2.1 bits/hour
Shannon efficiency 77.9 %
symbols file C:\TEMP\ebnaut20_APR_0123_6470-1pps-symbols.csv
elapsed 558 seconds

I like "decode" BE: "to be or not to be that is the question"  :-)

Files for reprocessing are here: http://rn3aus.narod.ru/ebnaut20_APR_0123.zip 
Also I have screenshots  21 uHz and 47 uHz 6470.005
73 de rn3aus

Пятница, 21 апреля 2017, 10:28 +03:00 от g3zjo <g3zjo@psk31.plus.com>:

On 20/04/2017 10:02, DK7FC wrote:

Last night i run another message:

f = 6470.100000 Hz
Start time: 19.Apr.2017   19:00:00 UTC
Symbol period: 30 s
Characters: 2
CRC bits: 20
Coding 16K21A
Duration: 6h, 56m
Antenna current: 460 mA

This is a chance for G3ZJO and RN3AUS and SQ5BPF. I generated EbNaut RX files from the tree, the message decoded without a single bit error.

Here are my complete results, just in case it contains any useful information. No decodes at all with with List Length 20000, I assume all falsies with 200000. The signal has been pretty poor in the last carrier transmission so I wasn't too hopeful..

Incidentally I noticed in SpecLab that the clock on Button 3 of my Ebnaut instance was stopped at 10:26  UTC (and probably the waterfall scroll too) yet it is still spewing out files for EbNaut. There must be a clue there somewhere. Win7 dual core processor, Hat 6 7/8, Shoe 9 UK, 44 EU.

ebnaut-rx V0.6
input file C:\Comms\EbNaut\20_APR_0121_6470.wav
sample rate 0.342935 per second
rx frequency 8270.1
file start time 2017-04-19 18:43:06.270
polynomial 16K21A
crc size 20
number of chars 2
block size 32
symbol period 30.000
number of symbols 832
list length 200000
start offset 1025.293
freq offset 0.000000
cores 2
skipped 1026.434179 seconds to start
initial reference phase 74.7
---------------------------------------------
found 89
list rank 144418
reference phase   60   60   60   60
carrier RMS 2.861e-005 noise RMS 9.431e-006
carrier S/N 9.64 dB in 40.1 uHz
carrier Es/N0 -19.56 dB
carrier Eb/N0 -0.93 dB
info bit period 2189.47 seconds
symbol error rate 374/832 = 44.952 %
Es/N0 from symbol errors -20.0 dB
Eb/N0 from symbol errors -1.4 dB
Shannon capacity 1.9 bits/hour
Shannon efficiency 86.3 %
symbols file C:\Comms\EbNaut\20_APR_0121_6470-symbols.csv
elapsed 44 seconds
---------------------------------------------
found 89
list rank 104145
reference phase   60   30   60   30
carrier RMS 2.962e-005 noise RMS 9.431e-006
carrier S/N 9.94 dB in 40.1 uHz
carrier Es/N0 -19.26 dB
carrier Eb/N0 -0.63 dB
info bit period 2189.47 seconds
symbol error rate 369/832 = 44.351 %
Es/N0 from symbol errors -19.9 dB
Eb/N0 from symbol errors -1.3 dB
Shannon capacity 2.0 bits/hour
Shannon efficiency 80.6 %
symbols file C:\Comms\EbNaut\20_APR_0121_6470-symbols.csv
elapsed 229 seconds
---------------------------------------------
found 2@
list rank 49804
reference phase  180  150  180  150
carrier RMS 2.952e-005 noise RMS 9.431e-006
carrier S/N 9.91 dB in 40.1 uHz
carrier Es/N0 -19.29 dB
carrier Eb/N0 -0.66 dB
info bit period 2189.47 seconds
symbol error rate 359/832 = 43.149 %
Es/N0 from symbol errors -18.2 dB
Eb/N0 from symbol errors 0.4 dB
Shannon capacity 2.0 bits/hour
Shannon efficiency 81.1 %
symbols file C:\Comms\EbNaut\20_APR_0121_6470-symbols.csv
elapsed 245 seconds
---------------------------------------------
found 2@
list rank 32051
reference phase  180  150 -150  180
carrier RMS 3.064e-005 noise RMS 9.431e-006
carrier S/N 10.24 dB in 40.1 uHz
carrier Es/N0 -18.97 dB
carrier Eb/N0 -0.33 dB
info bit period 2189.47 seconds
symbol error rate 359/832 = 43.149 %
Es/N0 from symbol errors -18.2 dB
Eb/N0 from symbol errors 0.4 dB
Shannon capacity 2.2 bits/hour
Shannon efficiency 75.3 %
symbols file C:\Comms\EbNaut\20_APR_0121_6470-symbols.csv
elapsed 370 seconds

73 Eddie G3ZJO