To: rsgb_lf_group@blacksheep.org
References: <8D2F6B4F05F1D66-14CC-11C938@webmail-vd017.sysops.aol.com>
 <8D2F7101B57B374-1830-415C5@webmail-vd014.sysops.aol.com>
From: =?UTF-8?Q?Wolfgang_B=c3=bcscher?= <dl4yhf@freenet.de>
Message-ID: <56589C1C.2030406@freenet.de>
Date: Fri, 27 Nov 2015 19:08:28 +0100
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In-Reply-To: <8D2F7101B57B374-1830-415C5@webmail-vd014.sysops.aol.com>
Subject: Re: LF: More EbNaut 137.777
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Greetings all,

Do we have a relatively stable, but not too strong 'carrier like' signal 
in the vincinity of 137 kHz,
to get a rough estimate of the local QRM level (by comparing that 
signal's SNR with the same receiver bandwidth, say 1 Hz) ?
I get the impression that mine, with a loop antenna (low-impedance, 
broadband) dangling under the roof, is far too high.
I didn't manage a single decode yet, which I first blamed on a bug in 
SL's timestamps (written into the decimated wave file), but since there 
was also not a trace of Joe's signal in a high-res spectrogram, I have 
my doubts..

73,
   Wolf DL4YHF .


Am 27.11.2015 um 10:49 schrieb Markus Vester:
> A few more weaker decodes occurred here around midnight, ending before 
> 1 UT. The spectrogram caught a short carrier around 0:20 UT (spectrum 
> showing on 
> https://dl.dropboxusercontent.com/u/26404526/EbNaut_spectrogram.png ).
>    2015 Nov 26/27
> start  Eb/N0  time offset
>  UT      dB    seconds
> 2030     nil
> 2100     1.3     1.2
> 2130     3.9     1.5
> 2200     5.4     1.9
> 2230     7.4     2.3
> 2300     8.4     2.5
> 2330     1.9     3.0
> 0000     2.2     3.4
> 0030     1.0     3.5
> 0100     nil
> 0130     nil
> Best 73,
> Markus (DF6NM)


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    Greetings all,<br>
    <br>
    Do we have a relatively stable, but not too strong 'carrier like'
    signal in the vincinity of 137 kHz,<br>
    to get a rough estimate of the local QRM level (by comparing that
    signal's SNR with the same receiver bandwidth, say 1 Hz) ?<br>
    I get the impression that mine, with a loop antenna (low-impedance,
    broadband) dangling under the roof, is far too high.<br>
    I didn't manage a single decode yet, which I first blamed on a bug
    in SL's timestamps (written into the decimated wave file), but since
    there was also not a trace of Joe's signal in a high-res
    spectrogram, I have my doubts..<br>
    <br>
    73,<br>
      Wolf DL4YHF .<br>
    <br>
    <br>
    <br>
    <div class="moz-cite-prefix">Am 27.11.2015 um 10:49 schrieb Markus
      Vester:<br>
    </div>
    <blockquote
      cite="mid:8D2F7101B57B374-1830-415C5@webmail-vd014.sysops.aol.com"
      type="cite">
      <div style="color: black; font-family: arial; font-size: 10pt;"><span
          style="display: inline-block;" contenteditable="false"></span></div>
      <div> A few more weaker decodes occurred here around
        midnight, ending before 1 UT. The spectrogram caught
        a short carrier around 0:20 UT (spectrum showing on <a
          moz-do-not-send="true"
href="https://dl.dropboxusercontent.com/u/26404526/EbNaut_spectrogram.png"><a class="moz-txt-link-freetext" href="https://dl.dropboxusercontent.com/u/26404526/EbNaut_spectrogram.png">https://dl.dropboxusercontent.com/u/26404526/EbNaut_spectrogram.png</a></a> ).</div>
      <div> </div>
      <div>   2015 Nov 26/27</div>
      <div> </div>
      <div>start  Eb/N0  time offset<br>
         UT      dB    seconds</div>
      <div> </div>
      <div>2030     nil<br>
        2100     1.3     1.2   <br>
        2130     3.9     1.5<br>
        2200     5.4     1.9<br>
        2230     7.4     2.3<br>
        2300     8.4     2.5<br>
        2330     1.9     3.0<br>
        0000     2.2     3.4<br>
        0030     1.0     3.5<br>
        0100     nil<br>
        0130     nil <br>
      </div>
      <div id="AOLMsgPart_1_7b3680ff-6dd1-4709-91a4-ed162bc5f146">
        <div
          id="aolmail_AOLMsgPart_1_f2f83e64-9f09-423a-a4f8-c3f65586b27f">Best
          73, </div>
        <div>Markus (DF6NM)</div>
      </div>
    </blockquote>
    <br>
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