RE: Re[2]: VLF: Trying 12 chars on 5170.1 Hz

[<hvanesce@comcast.net>]

Congratulations! Fine result at > 2,000 km overland at 5170 Hz (decode, 75.1% Shannon efficiency, -0.27 dB Eb/N0); an impressive milestone.

 

73,

 

Jim AA5BW

 

From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Alex K
Sent: Wednesday, January 17, 2018 11:03 AM
To: rsgb_lf_group@blacksheep.org; DK7FC
Subject: LF: Re[2]: VLF: Trying 12 chars on 5170.1 Hz

 

Hello Stefan, VLF!
I am glad to report that 12-char message on 5170.1 Hz is successfully decoded near Moscow. My congratulations to Stefan!
Also I made some mistake in the SpectrumLab's settings (32678 instead of 32768) and all ebnaut-files were exported with the wrong length. So councils from Stefan and Markus how to correct it were very useful! Thanks!
In stacking procedure were used ebnaut-files from 29Dec - 14Jan.

So... 73 to Deutschland!
:-)

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

PS My grabber was restarted and now is running on 4470.1 Hz and 8270.1 Hz (with corrected settings)

73 de Alex/rn3aus

Понедельник, 15 января 2018, 23:22 +03:00 от DK7FC <selberdenken@posteo.de>:

17 transmissions completed. Now i stopped transmitting and will QSY to 4470 Hz again soon, but this time with 300 mA. Tonite no transmission (rare).

73, Stefan

Am 29.12.2017 16:11, schrieb DK7FC:

From now on i'm trying to pass 12 characters over to near Moscow, despite the failed decode of the 3 char message.
Details:

f = 5170.1000 Hz
Start time: 29.Dec.2017  15:00:00 UTC
Symbol period: 30 s
Characters: 12
CRC bits: 20
Coding 16K21A
Duration: 14:56 [hh:mm]
Antenna current: 300 mA

A challenge for Jacek also, i think.
Maybe even for Riccardo with his new setup?

73, Stefan