Новости LF/VLF/ULF/SLF/ELF > VLF (ОНЧ — очень низкие частоты) диапазон с частотами от 3 до 30 кГц
VO1NA 8270 Hz
R1QBI:
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
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