Новости LF/VLF/ULF/SLF/ELF > VLF (ОНЧ — очень низкие частоты) диапазон с частотами от 3 до 30 кГц
DL3JMM
rn3aus:
Ночной эксперимент сорвался на передающей стороне. Расписание изменяется:
--- Цитировать ---Unfortunately, the EbNaut broadcast was canceled tonight due to a defect in the PA control.
Today, January 14, 2023, I repeat broadcasts every 6 hours starting at 09:00 UTC.
EbNaut 8K19A // crc16 // 30s // 5 chars
on the frequency 8270.03 Hz. (Duration: 15360 seconds, 04:16:00.00)
Repeats: 09:00, 15:00, 21:00, 03:00 UTC
--- Конец цитаты ---
rn3aus:
Ещё коррекция расписания:
The next transmission already started at 18:00 UTC because 18 is modulo of 6h. So they begin
next broadcasts probably:
today (01.14):
- 18:00
tomorrow (01.15):
- 00:00
- 06:00
- 12:00
- 18:00
Monday (01.16):
- 00:00
- 06:00
rn3aus:
Успешно принял все передачи с очень хорошим отношением С/Ш.
Приведу здесь результаты декодирования и уровни каждой передачи:
14Jan23 18:00
found BERND
list rank 0
reference phase 180,180,180,180
carrier S/N 21.27 dB in 65.1 uHz, -20.59 dB in 1Hz, -54.57 dB in 2.5kHz
carrier Es/N0 -5.82 dB
carrier Eb/N0 6.72 dB
symbol error rate 137/512 = 26.758 %
Es/N0 from symbol errors -7.1 dB
Eb/N0 from symbol errors 5.4 dB
Shannon capacity 40.2 bits/hour
Shannon efficiency 16.6 %
15Jan23 00:00
found BERND
list rank 0
reference phase 180,180,180,180
carrier S/N 22.03 dB in 65.1 uHz, -19.84 dB in 1Hz, -53.82 dB in 2.5kHz
carrier Es/N0 -5.07 dB
carrier Eb/N0 7.48 dB
symbol error rate 127/512 = 24.805 %
Es/N0 from symbol errors -6.3 dB
Eb/N0 from symbol errors 6.2 dB
Shannon capacity 46.9 bits/hour
Shannon efficiency 14.2 %
15Jan23 06:00
found BERND
list rank 0
reference phase 180,180,180,180
carrier S/N 26.92 dB in 65.1 uHz, -14.94 dB in 1Hz, -48.92 dB in 2.5kHz
carrier Es/N0 -0.17 dB
carrier Eb/N0 12.37 dB
symbol error rate 59/512 = 11.523 %
Es/N0 from symbol errors -1.4 dB
Eb/N0 from symbol errors 11.1 dB
Shannon capacity 116.6 bits/hour
Shannon efficiency 5.7 %
15Jan23 12:00
found BERND
list rank 0
reference phase 180,180,180,180
carrier S/N 28.71 dB in 65.1 uHz, -13.15 dB in 1Hz, -47.13 dB in 2.5kHz
carrier Es/N0 1.62 dB
carrier Eb/N0 14.16 dB
symbol error rate 23/512 = 4.492 %
Es/N0 from symbol errors 1.6 dB
Eb/N0 from symbol errors 14.1 dB
Shannon capacity 155.2 bits/hour
Shannon efficiency 4.3 %
15Jan23 18:00
found BERND
list rank 0
reference phase 180,180,180,180
carrier S/N 23.91 dB in 65.1 uHz, -17.95 dB in 1Hz, -51.93 dB in 2.5kHz
carrier Es/N0 -3.18 dB
carrier Eb/N0 9.36 dB
symbol error rate 91/512 = 17.773 %
Es/N0 from symbol errors -3.6 dB
Eb/N0 from symbol errors 8.9 dB
Shannon capacity 67.9 bits/hour
Shannon efficiency 9.8 %
16Jan23 00:00
found BERND
list rank 0
reference phase 180,180,180,180
carrier S/N 26.81 dB in 65.1 uHz, -15.05 dB in 1Hz, -49.03 dB in 2.5kHz
carrier Es/N0 -0.28 dB
carrier Eb/N0 12.26 dB
symbol error rate 50/512 = 9.766 %
Es/N0 from symbol errors -0.7 dB
Eb/N0 from symbol errors 11.8 dB
Shannon capacity 114.5 bits/hour
Shannon efficiency 5.8 %
16Jan23 06:00
found BERND
list rank 0
reference phase 180,180,180,180
carrier S/N 23.90 dB in 65.1 uHz, -17.96 dB in 1Hz, -51.94 dB in 2.5kHz
carrier Es/N0 -3.19 dB
carrier Eb/N0 9.35 dB
info bit period 538.95 seconds
symbol error rate 82/512 = 16.016 %
Es/N0 from symbol errors -3.0 dB
Eb/N0 from symbol errors 9.5 dB
Shannon capacity 67.8 bits/hour
Shannon efficiency 9.9 %
-----------------------------
sum.txt (stacking of 5 transmissions 14-15Jan)
found BERND
list rank 0
reference phase 180,180,180,180
carrier S/N 30.51 dB in 65.1 uHz, -11.35 dB in 1Hz, -45.33 dB in 2.5kHz
carrier Es/N0 3.42 dB
carrier Eb/N0 15.96 dB
info bit period 538.95 seconds
symbol error rate 15/512 = 2.930 %
Es/N0 from symbol errors 2.6 dB
Eb/N0 from symbol errors 15.1 dB
Shannon capacity 201.2 bits/hour
Shannon efficiency 3.3 %
Stacking:
add 15_JAN_0009_8270.txt
add 15_JAN_0609_8270.txt 1.91 0
add 15_JAN_1209_8270.txt 2.9 0 <-- best snr
add 15_JAN_1809_8270.txt 2.42 0
add 16_JAN_0009_8270.txt 1.7 0
Самый лучший прием был днем 15 января.
Можно порадоваться за Бернда - его сигнал декодирован у N4VLF!
Дистанция 7033 км
EW8HP:
Тоже удалось декодировать запись.
ebnaut-rx V0.9a
input file F:\EbNaut_RX\df6nm_ebnaut_utilities\15_JAN_1809_8270.wav
sample rate 0.342929 per second
rx frequency 8270.1
file start time 2023-01-15 11:31:05.860
polynomial 8K19A
crc size 16
number of chars 5
block size 46
symbol period 30.000
number of symbols 512
start offset 1734.1400
freq offset -0.070000
cores 1
list length 20000
skipped 1735.053534 seconds to start
initial reference phase -60.0
---------------------------------------------
found BERND
list rank 0
reference phase 180,180,180,180
carrier S/N 24.73 dB in 65.1 uHz, -17.13 dB in 1Hz, -51.11 dB in 2.5kHz
carrier Es/N0 -2.36 dB
carrier Eb/N0 10.18 dB
info bit period 538.95 seconds
symbol error rate 107/512 = 20.898 %
Es/N0 from symbol errors -4.8 dB
Eb/N0 from symbol errors 7.7 dB
Shannon capacity 79.2 bits/hour
Shannon efficiency 8.4 %
symbols file F:\EbNaut_RX\df6nm_ebnaut_utilities\15_JAN_1809_8270-symbols.csv
elapsed 4 seconds
---------------------------------------------
found BERND
list rank 0
reference phase -150,-150,180,180
carrier S/N 25.13 dB in 65.1 uHz, -16.74 dB in 1Hz, -50.72 dB in 2.5kHz
carrier Es/N0 -1.96 dB
carrier Eb/N0 10.58 dB
info bit period 538.95 seconds
symbol error rate 102/512 = 19.922 %
Es/N0 from symbol errors -4.4 dB
Eb/N0 from symbol errors 8.1 dB
Shannon capacity 85.2 bits/hour
Shannon efficiency 7.8 %
symbols file F:\EbNaut_RX\df6nm_ebnaut_utilities\15_JAN_1809_8270-symbols.csv
elapsed 29 seconds
---------------------------------------------
found BERND
list rank 0
reference phase -150,180,180,150
carrier S/N 25.23 dB in 65.1 uHz, -16.63 dB in 1Hz, -50.61 dB in 2.5kHz
carrier Es/N0 -1.86 dB
carrier Eb/N0 10.69 dB
info bit period 538.95 seconds
symbol error rate 97/512 = 18.945 %
Es/N0 from symbol errors -4.1 dB
Eb/N0 from symbol errors 8.4 dB
Shannon capacity 86.9 bits/hour
Shannon efficiency 7.7 %
symbols file F:\EbNaut_RX\df6nm_ebnaut_utilities\15_JAN_1809_8270-symbols.csv
elapsed 112 seconds
rn3aus:
Bernd передавал вчера (до сегодняшнего утра) несущую на 5170.03
Я опоздал с включением и настройкой, так что на спектрограмме виден пик сигнала соответствющий последним трем часам передачи. Тем не менее пик более-менее отчетливо виден.
Последний раз на этой частоте я принимал Стефана DK7FC пять лет назад, если не ошибаюсь.
Paul Nicholson сообщает, что несущая была зарегистрирована и в Индии, расстояние более 7000 км.
Вероятно, далее нужно готовиться к передачам EbNaut...
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