Message-ID: <5A049071.6000101@posteo.de>
Date: Thu, 09 Nov 2017 18:29:21 +0100
From: DK7FC <selberdenken@posteo.de>
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References: <15f97a252ec.marcocadeddu@tin.it> <65d2efca-36e8-b0dc-49fb-0077056b0aa0@abelian.org> <CAC+C6w4sMdgDKKwiwOSVohFUbvO0fC4a1TxwQFSHooroNH1+KQ@mail.gmail.com>
In-Reply-To: <CAC+C6w4sMdgDKKwiwOSVohFUbvO0fC4a1TxwQFSHooroNH1+KQ@mail.gmail.com>
Subject: Re: R: Re: VLF: EbNaut message over 2877 km, DK7FC to RC4HAA
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Hi Domenico,

Thanks for your continued interest in the very low frequencies :-)

Are you using vttime to correct the sample rate? Or are you doing it in 
SpecLab? The Alpha trace looks maybe a bit unstable(?).
If you have a second PC, you could try to make a local transmission, 
just with a piece of wire, and then checl if you can decode it. It would 
be a first check of the system.

I'm looking forward to the AMF!!! :-)

73, Stefan

Am 09.11.2017 17:59, schrieb Domenico IZ7SLZ:
> Hello VLF,
>
> First of all, congratulations to Stefan, Paul and all OM partecipating 
> at these experiments for the successfull results.
>
> I'm trying to receive some VLF Ebnaut, in Apulia -South Italy, till 
> now without joy.
>
> Unfortunatly, the remote location at Aunt Melina farm (AMF) , 5 km 
> away from my city is not yet ready.
> In the same time i'm trying, in my urban usual location, to streaming 
> (locally) the audio captured from linux pc using vlfrx-tools utilities.
> Vorbis stream sent by vtvorbis is received via lan from Spectrum Lab 
> on Xp PC. A 42 uHz grabber is running since 3 days now.
>
> http://qsl.net/iz7slz/OPDS/grabber.jpg
>
> Linux pc is also recording the raw audio using vtwrite.
> So i'm making some attempts to decode Dk7fc ebnaut trying to guess the 
> best parameters for vtblank.
> I have some question for Paul:
> Can you suggest and give some indications how to stack raw audio of 
> two or more different days using vlfrx-tools?
>
> Some advice for the vtblank configuration?
>
> I'm using version 07p.
>
> ...and questions for Joe VO1NA:
> Can you specify again the start time, frequency and all parameters of 
> your EBNAUT transmissions? Some long carrier has been transmitted by 
> you and in which hour?
> Thanks in advance.
> 73, Domenico /IZ7SLZ
>
>
>
>
> On 9 Nov 2017 17:28, "Paul Nicholson" <vlf0403@abelian.org 
> <mailto:vlf0403@abelian.org>> wrote:
>
>
>     Stefan wrote:
>
>     > f = 8270.1000 Hz
>     > Start time: 07.November.2017  16:00:00 UTC
>     > Symbol period: 60 s
>     > Characters: 3
>     > CRC bits: 9
>     > Coding 16K21A
>     > Duration: 12:32
>
>     > Paul, did you copy my message from last night and the night
>     > before?
>
>     Yes, a strong signal here and perfect decode of the 3 chars:
>
>                 H-field           E-field             E+H field
>      7th/8th  10.5 dB 99.8 deg   9.0 dB 107.3 deg   12.5 dB 103.3 deg
>      8th/9th  14.1 dB 88.3 deg  12.5 dB  93.8 deg   17.3 dB  90.9 deg
>
>     > I am getting no decode at RC4HAA, even when stacking both nights.
>
>     Signal phase repeated fine both nights.  Given the S/N of your 2 char
>     success, you would be very lucky to do 3 chars in one night, but two
>     nights ought to do it.
>
>     --
>     Paul Nicholson
>     --
>

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Hi Domenico, <br>
<br>
Thanks for your continued interest in the very low frequencies :-)<br>
<br>
Are you using vttime to correct the sample rate? Or are you doing it in
SpecLab? The Alpha trace looks maybe a bit unstable(?). <br>
If you have a second PC, you could try to make a local transmission,
just with a piece of wire, and then checl if you can decode it. It
would be a first check of the system.<br>
<br>
I'm looking forward to the AMF!!! :-)<br>
<br>
73, Stefan<br>
<br>
Am 09.11.2017 17:59, schrieb Domenico IZ7SLZ:
<blockquote
 cite="mid:CAC+C6w4sMdgDKKwiwOSVohFUbvO0fC4a1TxwQFSHooroNH1+KQ@mail.gmail.com"
 type="cite">
  <div dir="auto">Hello VLF,
  <div dir="auto"><br>
  </div>
  <div dir="auto">First of all, congratulations to Stefan, Paul and all
OM partecipating at these experiments for the successfull results.</div>
  <div dir="auto"><br>
  </div>
  <div dir="auto">I'm trying to receive some VLF Ebnaut, in Apulia
-South Italy, till now without joy.</div>
  <div dir="auto"><br>
  </div>
  <div dir="auto">Unfortunatly, the remote location at Aunt Melina farm
(AMF) , 5 km away from my city is not yet ready. </div>
  <div dir="auto">In the same time i'm trying, in my urban usual
location, to streaming (locally) the audio captured from linux pc using
vlfrx-tools utilities.</div>
  <div dir="auto">Vorbis stream sent by vtvorbis is received via lan
from Spectrum Lab on Xp PC. A 42 uHz grabber is running since 3 days
now.</div>
  <div dir="auto"><br>
  </div>
  <div dir="auto"><a moz-do-not-send="true"
 href="http://qsl.net/iz7slz/OPDS/grabber.jpg">http://qsl.net/iz7slz/OPDS/grabber.jpg</a><br>
  </div>
  <div dir="auto"><br>
  </div>
  <div dir="auto">Linux pc is also recording the raw audio using
vtwrite. </div>
  <div dir="auto">So i'm making some attempts to decode Dk7fc ebnaut
trying to guess the best parameters for vtblank.</div>
  <div dir="auto">I have some question for Paul:</div>
  <div dir="auto">Can you suggest and give some indications how to
stack raw audio of two or more different days using vlfrx-tools?</div>
  <div dir="auto"><br>
  </div>
  <div dir="auto">Some advice for the vtblank configuration? </div>
  <div dir="auto"><br>
  </div>
  <div dir="auto">I'm using version 07p.</div>
  <div dir="auto"><br>
  </div>
  <div dir="auto">...and questions for Joe VO1NA:</div>
  <div dir="auto">Can you specify again the start time, frequency and
all parameters of your EBNAUT transmissions? Some long carrier has been
transmitted by you and in which hour?</div>
  <div dir="auto">Thanks in advance. </div>
  <div dir="auto">73, Domenico /IZ7SLZ</div>
  <div dir="auto"><br>
  </div>
  <div dir="auto"><br>
  </div>
  <div dir="auto"><br>
  </div>
  </div>
  <div class="gmail_extra"><br>
  <div class="gmail_quote">On 9 Nov 2017 17:28, "Paul Nicholson" &lt;<a
 moz-do-not-send="true" href="mailto:vlf0403@abelian.org"
 target="_blank">vlf0403@abelian.org</a>&gt; wrote:<br
 type="attribution">
  <blockquote class="gmail_quote"
 style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><br>
Stefan wrote:<br>
    <br>
&gt; f = 8270.1000 Hz<br>
&gt; Start time: 07.November.2017  16:00:00 UTC<br>
&gt; Symbol period: 60 s<br>
&gt; Characters: 3<br>
&gt; CRC bits: 9<br>
&gt; Coding 16K21A<br>
&gt; Duration: 12:32<br>
    <br>
&gt; Paul, did you copy my message from last night and the night<br>
&gt; before?<br>
    <br>
Yes, a strong signal here and perfect decode of the 3 chars:<br>
    <br>
            H-field           E-field             E+H field<br>
 7th/8th  10.5 dB 99.8 deg   9.0 dB 107.3 deg   12.5 dB 103.3 deg<br>
 8th/9th  14.1 dB 88.3 deg  12.5 dB  93.8 deg   17.3 dB  90.9 deg<br>
    <br>
&gt; I am getting no decode at RC4HAA, even when stacking both nights.<br>
    <br>
Signal phase repeated fine both nights.  Given the S/N of your 2 char<br>
success, you would be very lucky to do 3 chars in one night, but two<br>
nights ought to do it.<br>
    <br>
--<br>
Paul Nicholson<br>
--<br>
    <br>
  </blockquote>
  </div>
  </div>
</blockquote>
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