Message-ID: <5AA810EF.5090804@posteo.de>
Date: Tue, 13 Mar 2018 18:57:03 +0100
From: DK7FC <selberdenken@posteo.de>
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To: rsgb_lf_group@blacksheep.org
References: <1UQOBAX9Wi.5GpBpi86BpG@optiplex980-pc> <5A9335F5.609@posteo.de>
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Subject: VLF: DK7FC > W1VD / K3SIW 8.27 kHz EbNaut
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VLF,

After more than 2 weeks, the 5 characer message has been transmitted 
nearly each night! Tonite will be the last night.

W1VD and K3SIW are collecting files since the 26th. There is a stack of 
15 nights available now!

So far there has been no decode, neither by weighting the stack based on 
informations known by the RX side nor by by weighting/aligning the stack 
based on informations known by the TX side.
However, the reconstructed spectrum peak reaches > 10 dB on both RX 
stations. The final optimum SNR will be reported tomorrow.

5 characters should have been made in a much shorter time, based on what 
we saw from the 2 character decode by W1VD. But the QRN insreased 
significantly since then. Another reason is the quickly shorter getting 
nighttime. The beginning and the end of the message is already in 
daylight now and so the terminator messes up the phase in the stack, 
reducing the stacking gain.

For Eb/N0 = 0 dB we need 14.5 dB SNR, so there is no hope, except i 
would use a kite again and add 10 dB ERP!!!! :-)

We will see how things go on 17.47 kHz on the same paths. I will be on 
air there in 2 days, starting attempts to be detected in VK7.

73, Stefan


Am 25.02.2018 23:17, schrieb DK7FC:
> 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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VLF, <br>
<br>
After more than 2 weeks, the 5 characer message has been transmitted
nearly each night! Tonite will be the last night. <br>
<br>
W1VD and K3SIW are collecting files since the 26th. There is a stack of
15 nights available now! <br>
<br>
So far there has been no decode, neither by weighting the stack based
on informations known by the RX side nor by by weighting/aligning the
stack based on informations known by the TX side. <br>
However, the reconstructed spectrum peak reaches &gt; 10 dB on both RX
stations. The final optimum SNR will be reported tomorrow.<br>
<br>
5 characters should have been made in a much shorter time, based on
what we saw from the 2 character decode by W1VD. But the QRN insreased
significantly since then. Another reason is the quickly shorter getting
nighttime. The beginning and the end of the message is already in
daylight now and so the terminator messes up the phase in the stack,
reducing the stacking gain.<br>
<br>
For Eb/N0 = 0 dB we need 14.5 dB SNR, so there is no hope, except i
would use a kite again and add 10 dB ERP!!!! :-)<br>
<br>
We will see how things go on 17.47 kHz on the same paths. I will be on
air there in 2 days, starting attempts to be detected in VK7.<br>
<br>
73, Stefan <br>
<br>
<br>
<br>
<br>
Am 25.02.2018 23:17, schrieb DK7FC:
<blockquote cite="mid:5A9335F5.609@posteo.de" type="cite">
  <meta content="text/html; charset=UTF-8" http-equiv="Content-Type">
  <title></title>
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 moz-do-not-send="true"
 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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