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Re: VLF: DK7FC > W1VD 8.27 kHz EbNaut more success!

To: [email protected]
Subject: Re: VLF: DK7FC > W1VD 8.27 kHz EbNaut more success!
From: DK7FC <[email protected]>
Date: Sun, 25 Feb 2018 23:17:25 +0100
Dkim-signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.de; s=2017; t=1519597048; bh=PrEuNpiidk3BQzSQd/hEhNezwU1E7qKJRFLImh/16EU=; h=Date:From:To:Subject:From; b=ZzeK3QXkSz30jVaIW+uAf/wdZCa6oy/drqKhUHusakeYd1gUunj+6RVSv8wc6ijws KRIqsl/n1CALqaICVJPiMLF73XszwapQzncVUzYggQ859hX31OdHCccAywGpfFXJvS NTxz+e7G/PkuSU8+WyEPuvVl0AKQH4lbOf1BxQecEpDhFr2PjPpV7mrTjJRqRLCqym yRe9S4U4JfopG7/8njk7nC+LDRIuIu5oXb2NFF7Dvcl4cgdn1UBooFkk99IM0g86Z3 DWVyamQ4JwNlZ0XbpRFQWzNO2FkfOaZiwhaj4WiEJcfQzyRaYsmVLealZmGmiq160o qLtKymtcCstHA==
In-reply-to: <1UQOBAX9Wi.5GpBpi86BpG@optiplex980-pc>
References: <1UQOBAX9Wi.5GpBpi86BpG@optiplex980-pc>
Reply-to: [email protected]
Sender: [email protected]
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Hi Jay, VLF,

A great success again! Thanks for your efforts on the RX side. And congrats to that result!
It was exciting and interesting to follow the rising Eb/N0 and the daily variations when using the -f16 function in the Linux decoder.
It can be quite an effort to tweak out the last 0.05 dB in the hope to find the correct message then, by varying time offsets and weighting. I am learning a bit more each time i follow the decode process here on the TX side by analysing the wav files you kindly provided.

We are now leaving the winter season. The QRN has been clearly stronger during the last nights. There are regular thunderstorms in south Italy and Greece now.

A longer message is realistic. Let us try 5 characters now:

f = 8270.1000 Hz
Start time: 25.FEB.2018  22:30:00 UTC (daily)
Symbol period: 24 s
Characters: 5
CRC bits: 18
Coding 16K21A
Duration: 07:15:12 [hh:mm:ss]
Antenna current: 700 mA


I bet you will get the result after 4 days of stacking! Let's see! Good luck!

73, Stefan




Am 25.02.2018 19:23, schrieb [email protected]:
Stefans transmission:
 
f = 8270.1000 Hz
Start time: 19.FEB.2018  22:30:00 UTC (daily)
Symbol period: 30 s
Characters: 2
CRC bits: 22
Coding 16K21A
Duration: 07:12 [hh:mm]
Antenna current: 700 mA
 
After a successful one character reception earlier in the week, we can now report the successful reception of a 2 character message. Stacking of 3  transmissions was required (0221, 0222 and 0223). There is also a 0224 file but it has timing issues and may or may not be usable.
 
ebnaut-rx V0.8
input file C:\EbNaut\DK7FC\sum212223.wav
sample rate 0.457240 per second
rx frequency 8270
file start time 2018-02-22 22:21:17.790
polynomial 16K21A
crc size 22
number of chars 2
block size 34
symbol period 30.000
number of symbols 864
start offset 537.000
freq offset 0.100000
cores 2
list length 500000
skipped 538.011261 seconds to start
initial reference phase 30.6
---------------------------------------------
found DX
list rank 48426
reference phase 150,150,150,150
carrier S/N 11.04 dB in 38.6 uHz, -33.10 dB in 1Hz, -67.08 dB in 2.5kHz
carrier Es/N0 -18.33 dB
carrier Eb/N0 0.47 dB
info bit period 2273.68 seconds
symbol error rate 373/864 = 43.171 %
Es/N0 from symbol errors -18.2 dB
Eb/N0 from symbol errors 0.6 dB
Shannon capacity 2.5 bits/hour
Shannon efficiency 62.7 %
symbols file C:\EbNaut\DK7FC\sum212223-symbols.csv
elapsed 52 seconds
---------------------------------------------
found DX
list rank 17074
reference phase 120,150,120,150
carrier S/N 11.19 dB in 38.6 uHz, -32.94 dB in 1Hz, -66.92 dB in 2.5kHz
carrier Es/N0 -18.17 dB
carrier Eb/N0 0.62 dB
info bit period 2273.68 seconds
symbol error rate 374/864 = 43.287 %
Es/N0 from symbol errors -18.4 dB
Eb/N0 from symbol errors 0.4 dB
Shannon capacity 2.6 bits/hour
Shannon efficiency 60.5 %
symbols file C:\EbNaut\DK7FC\sum212223-symbols.csv
elapsed 383 seconds
Jay W1VD  WD2XNS  WE2XGR/2
 
 
 

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