Автор Тема: Эксперименты на 8.97 кГц  (Прочитано 29962 раз)

0 Пользователей и 1 Гость просматривают эту тему.

Оффлайн rn3aus

  • Ветеран
  • *****
  • Сообщений: 2183
    • Просмотр профиля
Re: Эксперименты на 8.97 кГц
« Ответ #150 : 17 Январь 2018, 20:42:22 »
Удалось принять 12-ти символьное сообщение Стефана на 5170.1 Гц. Для этого понадобилось сложить файлы, накопленные за 14 дней:
ebnaut-rx V0.7a
input file C:\EbNaut\DK7FC-12ch-5170\sum_dk7fc — копия.wav
sample rate 0.514403 per second
rx frequency 5170.1
file start time 2018-01-14 14:32:26.360
polynomial 16K21A
crc size 20
number of chars 12
block size 92
symbol period 30.000
number of symbols 1792
list length 20000000
start offset 1660.000
freq offset 0.000000
cores 1
skipped 1660.178234 seconds to start
initial reference phase -10.0
---------------------------------------------
found 73 TO RUSSIA
list rank 898759
reference phase    0    0    0    0
carrier S/N 18.08 dB in 18.6 uHz, -29.23 dB in 1Hz, -63.21 dB in 2.5kHz
carrier Es/N0 -14.46 dB
carrier Eb/N0 -0.27 dB
info bit period 785.96 seconds
symbol error rate 720/1792 = 40.179 %
Es/N0 from symbol errors -15.0 dB
Eb/N0 from symbol errors -0.8 dB
Shannon capacity 6.1 bits/hour
Shannon efficiency 75.1 %
symbols file C:\EbNaut\DK7FC-12ch-5170\sum_dk7fc — копия-symbols.csv
elapsed 159 seconds

Оффлайн rw3adb

  • Ветеран
  • *****
  • Сообщений: 4403
    • Просмотр профиля
    • E-mail
Re: Эксперименты на 8.97 кГц
« Ответ #151 : 07 Октябрь 2018, 17:45:02 »
Стефан принял передачу Рикардо IW4DXW 8270.003 Hz в Ebnaut.


Hi Riccardo,

I also got your 06:30 transmission:

found rank 0 ber 3.9497e-01 Eb/N0 0.9 M -1.385156938e-04 ph 5 150,150,150,150 [IW4DXW]
carrier phase: -3.4 deg
carrier Eb/N0: 0.9 dB
carrier Es/N0: -14.36 dB
carrier S/N: 16.25 dB in 43.4 uHz, -27.37 dB in 1Hz, -61.35 dB in 2.5kHz

73, Stefan



Am 05.10.2018 08:13, schrieb Riccardo:

    Свернуть

    A new transmission is starting at 06:30 UTC.


    73 de Riccardo IW4DXW


    Il Gio 4 Ott 2018, 21:43 Riccardo  ha scritto:

        Свернуть

        Ok, Stefan, thanks. I'm ready:

        Start at 00:00 UTC (5 Oct)
        Coding 16K21A
        CRC 16
        20 sec/sym
        6 char
        Duration 6 h, 24 min

        ...hoping the noise remains low.

        73, Riccardo IW4DXW



Hi Stefan,

Congratulations! It was less of 10 μW.
Thanks for your efforts to decode me. And thanks again to Paul.

The experiment will be portable with a very simple equipment: a 12V 60Ah lead-acid battery (pretty heavy, but i'm considering to buy a LiFePO4 battery pack) and a 200W car audio PA with input connected to a FM RX (QRG in the 70 cm band, no WLAN audio streaming and stuff).
400 meters away, at home, I have the FM TX (500 mW or less) modulated by the PC audio. The feedback for Spectrum Lab will be taken from a little loop (or my main antenna). Do you think that would work?
Tomorrow, wx permitting, I'll measure the impedance of the ground loop.


73 de Riccardo IW4DXW
--_ _ _  _ _ _ --  --_   _   _-_  _--  _ _ _-- _- -_ _ -_ _ _