LF: Re[2]: LF: Re: DK7FC EbNaut message on 8270.1 Hz decoded nr Moscow by RN3AUS

[rn3aus@gmail.com]

Hello Stefan, VLF,
1) excellent decode of 13 feb 20:40 UTC transmission with rank=0 !! (ebnaut txt file taked from GBZ-synchronized PC)
ebnaut-rx V0.5
input file C:\EbNaut\EbNaut14_FEB_0302_8270.wav
sample rate 0.342939 per second
rx frequency 8270.1
file start time 2017-02-13 20:24:10.590
polynomial 16K21A
crc size 32
number of chars 2
block size 44
symbol period 30.000
number of symbols 1024
list length 2000000
start offset 961.374
freq offset 0.000000
cores 1
skipped 962.269416 seconds to start
initial reference phase -43.1
---------------------------------------------
found 73
list rank 0
reference phase  180  180  180  180
carrier RMS 7.896e-004 noise RMS 1.034e-004
carrier S/N 17.66 dB in 32.6 uHz
carrier Es/N0 -12.45 dB
carrier Eb/N0 7.09 dB
info bit period 2694.74 seconds
symbol error rate 385/1024 = 37.598 %
Es/N0 from symbol errors -13.0 dB
Eb/N0 from symbol errors 6.5 dB
Shannon capacity 9.6 bits/hour
Shannon efficiency 13.9 %
symbols file C:\EbNaut\EbNaut14_FEB_0302_8270-symbols.csv
elapsed 37 seconds
---------------------------------------------
found 73
list rank 0
reference phase -150  180  180  150
carrier RMS 7.922e-004 noise RMS 1.034e-004
carrier S/N 17.68 dB in 32.6 uHz
carrier Es/N0 -12.42 dB
carrier Eb/N0 7.12 dB
info bit period 2694.74 seconds
symbol error rate 392/1024 = 38.281 %
Es/N0 from symbol errors -13.5 dB
Eb/N0 from symbol errors 6.0 dB
Shannon capacity 9.6 bits/hour
Shannon efficiency 13.9 %
symbols file C:\EbNaut\EbNaut14_FEB_0302_8270-symbols.csv
elapsed 446 seconds


2) And strange decode of 14feb 20:00 transmission:
ebnaut-rx V0.5
input file C:\EbNaut\ebnaut15_FEB_0214_8270-1pps.wav
sample rate 0.342935 per second
rx frequency 8270.1
file start time 2017-02-14 19:35:59.790
polynomial 16K21A
crc size 26
number of chars 3
block size 44
symbol period 30.000
number of symbols 1024
list length 4000000
start offset 1451.754
freq offset 0.000000
cores 2
skipped 1452.170236 seconds to start
initial reference phase 29.4
---------------------------------------------
found ;J=
list rank 2608042
reference phase  -30  -30  -30  -30
carrier RMS 2.065e-004 noise RMS 5.133e-005
carrier S/N 12.09 dB in 32.6 uHz
carrier Es/N0 -18.01 dB
carrier Eb/N0 -0.24 dB
info bit period 1796.49 seconds
symbol error rate 456/1024 = 44.531 %
Es/N0 from symbol errors -20.0 dB
Eb/N0 from symbol errors -2.2 dB
Shannon capacity 2.7 bits/hour
Shannon efficiency 73.8 %
symbols file C:\EbNaut\ebnaut15_FEB_0214_8270-1pps-symbols.csv
elapsed 206 seconds
---------------------------------------------
found ;J=
list rank 940038
reference phase    0  -30    0  -30
carrier RMS 2.244e-004 noise RMS 5.133e-005
carrier S/N 12.81 dB in 32.6 uHz
carrier Es/N0 -17.29 dB
carrier Eb/N0 0.48 dB
info bit period 1796.49 seconds
symbol error rate 460/1024 = 44.922 %
Es/N0 from symbol errors -20.0 dB
Eb/N0 from symbol errors -2.2 dB
Shannon capacity 3.2 bits/hour
Shannon efficiency 62.6 %
symbols file C:\EbNaut\ebnaut15_FEB_0214_8270-1pps-symbols.csv
elapsed 965 seconds
---------------------------------------------
found ;J=
list rank 821416
reference phase  -30  -60  -30  -60
carrier RMS 2.244e-004 noise RMS 5.133e-005
carrier S/N 12.81 dB in 32.6 uHz
carrier Es/N0 -17.29 dB
carrier Eb/N0 0.48 dB
info bit period 1796.49 seconds
symbol error rate 456/1024 = 44.531 %
Es/N0 from symbol errors -20.0 dB
Eb/N0 from symbol errors -2.2 dB
Shannon capacity 3.2 bits/hour
Shannon efficiency 62.6 %
symbols file C:\EbNaut\ebnaut15_FEB_0214_8270-1pps-symbols.csv
elapsed 1020 seconds
---------------------------------------------
found ;J=
list rank 565178
reference phase  -30  -60    0  -30
carrier RMS 2.222e-004 noise RMS 5.133e-005
carrier S/N 12.73 dB in 32.6 uHz
carrier Es/N0 -17.38 dB
carrier Eb/N0 0.40 dB
info bit period 1796.49 seconds
symbol error rate 455/1024 = 44.434 %
Es/N0 from symbol errors -20.0 dB
Eb/N0 from symbol errors -2.2 dB
Shannon capacity 3.1 bits/hour
Shannon efficiency 63.8 %
symbols file C:\EbNaut\ebnaut15_FEB_0214_8270-1pps-symbols.csv
elapsed 1242 seconds

Grabber is running.....         :)

Среда, 15 февраля 2017, 13:30 +03:00 от DK7FC <selberdenken@posteo.de>:

The message was not completely transmitted, again for an unknown reason / software failure. Next week i will get a new old PC for VLF transmissions, which will have 2 GB RAM instead of 512 MB RAM! I hope that solves the problem.
About 2/3 of the message was transmitted, a loss of 1.76 dB (can one calculate that loss so easily, 10*log(2/3), ?). So with some luck it can be decoded anyway in Moscow and other locations?

73, Stefan

Am 14.02.2017 11:32, schrieb DK7FC:

Now i'm a bit more optimistic and will try 3 characters next:

f = 8270.100000 Hz
Start time: 14.Feb.2017   20:00:00 UTC
Symbol period: 30 s
Characters: 3
CRC bits: 26
Coding 16K21A
Duration: 8h, 32m, 0s (same duration as the first 2 messages)
Antenna current: 700 mA

DK7FC-ebnaut-13feb2017-2040z.png
Description: PNG image