Hello Alex, Joe,
Wow! My congratulations. Very impressing!!! A true milestone. Did you
think that this will be possible, two years ago? :-)
Joe, i would suggest to try a longer message, like 3 characters, 16K21A,
40 second symbols and CRC 16.
http://abelian.org/ebnaut/calc.php?sndb=12.93&snbws=0.000031&snmps=&code=16K21&sp=40&crc=16&nc=3&submit=Calculate
This will help to solve doubts with multiple decodes.
Or just try your callsign or another 5 character message with
http://abelian.org/ebnaut/calc.php?sndb=12.93&snbws=0.000031&snmps=&code=16K21&sp=30&crc=16&nc=5&submit=Calculate
You can do it within 5 days or so!
Here i still cannot receive anyone, the tree is still down...
73, Stefan
Am 28.12.2017 17:10, schrieb [email protected]:
Congratulations Alex. This is the correct letter -- truly amazing!
A new letter for tonight if there is no objection.
73
Joe VO1NA
On Thu, 28 Dec 2017, Alex K wrote:
Hello Joe, Paul, VLF!
It is not easy to believe but I can try now to say: looks like I have
decode of VO1NA 1-char message: "S"!
(But may be it is false decode? :-/ )
So this decode taked from individual files of 24 Dec and 26 Dec
transmissions and also from stacking procedure of all seven files
without any other false decodes.
Stacking of 24Dec and 26Dec with phase shift 60 deg give me strongest
decode with rank 0:
ebnaut-rx V0.7a
input file C:\EbNaut\VLF_EBNAUT\VO1NA-dec2017\sum.wav
sample rate 0.342935 per second
rx frequency 8270.1
file start time 2017-12-26 20:32:18.390
polynomial 16K21A
crc size 8
number of chars 1
block size 14
symbol period 60.000
number of symbols 544
list length 2000
start offset 1672.000
freq offset -0.092500
cores 1
skipped 1670.870573 seconds to start
initial reference phase 48.3
---------------------------------------------
found S
list rank 0
reference phase 0 0 0 0
carrier S/N 12.20 dB in 30.6 uHz, -32.94 dB in 1Hz, -66.92 dB in 2.5kHz
carrier Es/N0 -15.16 dB
carrier Eb/N0 4.64 dB
info bit period 5726.32 seconds
symbol error rate 209/544 = 38.419 %
Es/N0 from symbol errors -13.6 dB
Eb/N0 from symbol errors 6.2 dB
Shannon capacity 2.6 bits/hour
Shannon efficiency 24.2 %
symbols file C:\EbNaut\VLF_EBNAUT\VO1NA-dec2017\sum-symbols.csv
elapsed 7 seconds
---------------------------------------------
found S
list rank 0
reference phase 30 30 0 0
carrier S/N 12.62 dB in 30.6 uHz, -32.52 dB in 1Hz, -66.49 dB in 2.5kHz
carrier Es/N0 -14.73 dB
carrier Eb/N0 5.06 dB
info bit period 5726.32 seconds
symbol error rate 214/544 = 39.338 %
Es/N0 from symbol errors -14.3 dB
Eb/N0 from symbol errors 5.5 dB
Shannon capacity 2.9 bits/hour
Shannon efficiency 22.0 %
symbols file C:\EbNaut\VLF_EBNAUT\VO1NA-dec2017\sum-symbols.csv
elapsed 78 seconds
---------------------------------------------
found S
list rank 0
reference phase 0 0 -30 -30
carrier S/N 12.62 dB in 30.6 uHz, -32.52 dB in 1Hz, -66.49 dB in 2.5kHz
carrier Es/N0 -14.73 dB
carrier Eb/N0 5.06 dB
info bit period 5726.32 seconds
symbol error rate 208/544 = 38.235 %
Es/N0 from symbol errors -13.4 dB
Eb/N0 from symbol errors 6.4 dB
Shannon capacity 2.9 bits/hour
Shannon efficiency 22.0 %
symbols file C:\EbNaut\VLF_EBNAUT\VO1NA-dec2017\sum-symbols.csv
elapsed 102 seconds
---------------------------------------------
found S
list rank 0
reference phase 30 0 0 -30
carrier S/N 12.93 dB in 30.6 uHz, -32.21 dB in 1Hz, -66.19 dB in 2.5kHz
carrier Es/N0 -14.42 dB
carrier Eb/N0 5.37 dB
info bit period 5726.32 seconds
symbol error rate 208/544 = 38.235 %
Es/N0 from symbol errors -13.4 dB
Eb/N0 from symbol errors 6.4 dB
Shannon capacity 3.1 bits/hour
Shannon efficiency 20.5 %
symbols file C:\EbNaut\VLF_EBNAUT\VO1NA-dec2017\sum-symbols.csv
elapsed 318 seconds
All files for reprocessing are here:
http://rn3aus.narod.ru/VO1NA-1char.zip
73 de rn3aus/Alex
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