VO1NA 8270 Hz

[rn3aus]

EbNaut передача VO1NA декодирована в нескольких странах:

VO1NA wrote:

 > 2100 utc tonight [21st], 16K21A, CRC-8, one character,
 > 544 symbols, 1 minute each, 8270.0075 Hz.

Todmorden (3575 km)
-------------------

Decoded easily. Eb/N0 +11.1 dB, S/N -26.52 dB in 1Hz,
-60.50 dB in 2.5kHz, rank 0, BER 32%, constant reference phase.

Good quality signal, stable and strong - over 10dB to spare at
the decoder.

Bielefeld (4301.5 km DL4YHF)
----------------------------

Decoded easily. Eb/N0 +4.7 dB, S/N -32.91 dB in 1Hz,
-66.89 dB in 2.5kHz, rank 0, BER 41%, constant reference phase.

First Canada to Germany VLF decode, I think.

Perhaps Stefan also decodes? Distance is slightly greater
at 4419.8 km.

Wolf's receiver has been working very well the last few days.
Wonder if some improvement has been made?

Warsaw (5096.6 km SQ5BPF)
-------------------------

Decoded easily. Eb/N0 +1.0 dB, S/N -36.58 dB in 1Hz,
-70.56 dB in 2.5kHz, rank 5, BER 44%, constant reference phase.

First Canada to Poland VLF decode.

Cumiana
-------

Unfortunately off line, timing problems, system being re-installed.

--

What a great result!

Will send the decode off-list to confirm, but it is most unlikely to
be false given the strong signal and the same decode at three
sites.

--
Paul Nicholson
--

PS: через пару дней и я смогу попробовать декодировать эту передачу, когда в очередной раз заберу данные с граббера....

[Сергей UB1APE]

ВАХ!

[rn3aus]

До сих пор несколько не верится, что это случилось:
мне удалось это принять! Притом как со сложением нескольких записей за несколько дней, так и индивидуально, за один день (ночь)! Тем более удивительно, что излучаемая мощнось у Joe вроде всего 10 мкВт 
Самый сильный прием произошел в ночь с 26 на 27 декабря.
Joe VO1NA подтвердил правильность приема.
Итак,  5810.5 км на частоте 8270.0075 Гц преодалено! Это конечно не мировой рекорд (равный сейчас 7173.4 км W4DEX-IK1IFQ), но для меня лично очень много.
Рекорды здесь: http://abelian.org/vlf/amateur-radio/

Вот что дал декодер:

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

Все файлы для репроцессинга здесь:
http://rn3aus.narod.ru/VO1NA-1char.zip

[EW6X]

Александр, КРУТО! ПОЗДРАВЛЯЮ!!! 

[EW8HP]

Присоединяюсь к поздравлениям..))! Вот так подарочек в канун нового года..)

[Р1ЩБИ]

Мои поздравления Александр!

[Сергей UB1APE]

По моему вы сделали себе отличный Новогодний подарок! Поздравляю!!!!

[rn3aus]

Принято следующее сообщение от VO1NA, на этот раз путем сложения 10 файлов (минимально потребовалось 4).

ebnaut-rx V0.7a
input file C:\EbNaut\VLF_EBNAUT\VO1NA-Jan2018\sum_vo1na.wav
sample rate 0.514403 per second
rx frequency 8270.1
file start time 2018-01-09 20:32:28.360
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 1660.500
freq offset -0.092500
cores 1
skipped 1660.178234 seconds to start
initial reference phase -25.8
---------------------------------------------
found V
list rank 0
reference phase    0    0    0    0
carrier S/N 11.86 dB in 30.6 uHz, -33.28 dB in 1Hz, -67.26 dB in 2.5kHz
carrier Es/N0 -15.49 dB
carrier Eb/N0 4.30 dB
info bit period 5726.32 seconds
symbol error rate 229/544 = 42.096 %
Es/N0 from symbol errors -17.0 dB
Eb/N0 from symbol errors 2.8 dB
Shannon capacity 2.4 bits/hour
Shannon efficiency 26.1 %
symbols file C:\EbNaut\VLF_EBNAUT\VO1NA-Jan2018\sum_vo1na-symbols.csv
elapsed 7 seconds
---------------------------------------------

[rw3adb]

Джо добил вчера на этой частоте до Германии.
передавал многочасвую несущую.

That continuous trace on Paul's spectrogram is impressive - great work!

Attempting to extract a long spectrum from Paul's data creates a split peak at +-12 uHz from the center, suggesting a repeating near 180° phase difference between day and night.

A close look on our Bavarian 31 uHz spectrograms seems to bring up some faint traces on the right frequency, but to be more sure we still need a few dB less noise, or more ERP.

Best 73,
Markus (DF6NM)


-----Ursprüngliche Mitteilung-----
Von:
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Mo, 10. Sept 2018 21:33
Betreff: Re: LF: VO1NA 8270.0075 Hz

I've not been mucking with the tx or tuning so perhaps Mother Nature has
provided an ERP improvement -- the wx has been quite dry recently.

Thank-you for the report and the spectrogram service. It keeps me
entertained, especially since it seems impossible to see my own
sigs with a remote setup at distances greater than about 10 km.

Been playing with vt tools and a cheap sound card.

73
Joe VO1NA

On Sun, 9 Sep 2018, Paul Nicholson wrote:

VO1NA from Newfoundland with 10uW must hold the record for
the longest running VLF transmission!

Coming in well the last couple of days -

http://78.46.38.217/fbins3.html#p=1536487200&b=280&s=sp&m=cardioid&w=r&h=62&z1=0.34&z2=0.64&c=1

An ERP improvement, or good propagation?

--
Paul Nicholson