Message-ID: <5A9335F5.609@posteo.de>
Date: Sun, 25 Feb 2018 23:17:25 +0100
From: DK7FC <selberdenken@posteo.de>
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To: rsgb_lf_group@blacksheep.org
References: <1UQOBAX9Wi.5GpBpi86BpG@optiplex980-pc>
In-Reply-To: <1UQOBAX9Wi.5GpBpi86BpG@optiplex980-pc>
Subject: Re: VLF: DK7FC > W1VD 8.27 kHz EbNaut more success!
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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 jrusgrove@comcast.net:
> 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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Hi Jay, VLF,<br>
<br>
A great success again! Thanks for your efforts on the RX side. And
congrats to that result!<br>
It was exciting and interesting to follow the rising Eb/N0 and the
daily variations when using the -f16 function in the Linux decoder.<br>
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.<br>
<br>
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.<br>
<br>
A longer message is realistic. Let us try 5 characters now:<br>
<br>
<strong>f = 8270.1000 Hz<br abp="2715">
Start time: 25.FEB.2018  22:30:00 UTC (daily)<br abp="2716">
Symbol period: 24 s<br abp="2717">
Characters: 5<br abp="2718">
CRC bits: 18<br abp="2719">
Coding 16K21A<br abp="2720">
Duration: 07:15:12 [hh:mm:ss]<br abp="2721">
Antenna current: 700 mA</strong><br>
<br>
I bet you will get the result after 4 days of stacking! Let's see! Good
luck!<br>
<br>
73, Stefan<br>
<br>
<br>
<br>
<br>
Am 25.02.2018 19:23, schrieb <a class="moz-txt-link-abbreviated" href="mailto:jrusgrove@comcast.net:">jrusgrove@comcast.net:</a>
<blockquote cite="mid:1UQOBAX9Wi.5GpBpi86BpG@optiplex980-pc" type="cite">
  <style type="text/css"> body { margin:0.7em; } body.OECFntDef, body.OECFntDef div { font-family:Arial,"Segoe UI",Tahoma,Verdana,Helvetica,sans-serif;font-size:10pt; }</style>
  <meta name="GENERATOR" content="MSHTML 11.00.9600.18450">
  <div>Stefans transmission:</div>
  <div> </div>
  <div><strong>f = 8270.1000 Hz<br abp="2715">
Start time: 19.FEB.2018  22:30:00 UTC (daily)<br abp="2716">
Symbol period: 30 s<br abp="2717">
Characters: 2<br abp="2718">
CRC bits: 22<br abp="2719">
Coding 16K21A<br abp="2720">
Duration: 07:12 [hh:mm]<br abp="2721">
Antenna current: 700 mA</strong></div>
  <div><strong></strong> </div>
  <div>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. </div>
  <div> </div>
  <div>ebnaut-rx V0.8<br>
input file C:\EbNaut\DK7FC\sum212223.wav<br>
sample rate 0.457240 per second<br>
rx frequency 8270<br>
file start time 2018-02-22 22:21:17.790<br>
polynomial 16K21A<br>
crc size 22<br>
number of chars 2<br>
block size 34<br>
symbol period 30.000<br>
number of symbols 864<br>
start offset 537.000<br>
freq offset 0.100000<br>
cores 2<br>
list length 500000<br>
skipped 538.011261 seconds to start<br>
initial reference phase 30.6<br>
---------------------------------------------<br>
found DX<br>
list rank 48426<br>
reference phase 150,150,150,150<br>
carrier S/N 11.04 dB in 38.6 uHz, -33.10 dB in 1Hz, -67.08 dB in 2.5kHz<br>
carrier Es/N0 -18.33 dB<br>
carrier Eb/N0 0.47 dB<br>
info bit period 2273.68 seconds<br>
symbol error rate 373/864 = 43.171 %<br>
Es/N0 from symbol errors -18.2 dB<br>
Eb/N0 from symbol errors 0.6 dB<br>
Shannon capacity 2.5 bits/hour<br>
Shannon efficiency 62.7 %<br>
symbols file C:\EbNaut\DK7FC\sum212223-symbols.csv<br>
elapsed 52 seconds<br>
---------------------------------------------<br>
found DX<br>
list rank 17074<br>
reference phase 120,150,120,150<br>
carrier S/N 11.19 dB in 38.6 uHz, -32.94 dB in 1Hz, -66.92 dB in 2.5kHz<br>
carrier Es/N0 -18.17 dB<br>
carrier Eb/N0 0.62 dB<br>
info bit period 2273.68 seconds<br>
symbol error rate 374/864 = 43.287 %<br>
Es/N0 from symbol errors -18.4 dB<br>
Eb/N0 from symbol errors 0.4 dB<br>
Shannon capacity 2.6 bits/hour<br>
Shannon efficiency 60.5 %<br>
symbols file C:\EbNaut\DK7FC\sum212223-symbols.csv<br>
elapsed 383 seconds<br>
  </div>
  <div>Jay W1VD  WD2XNS  WE2XGR/2</div>
  <div> </div>
  <div> </div>
  <div><strong></strong> </div>
  <div><br>
  </div>
</blockquote>
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