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Date: Thu, 07 Apr 2011 19:35:55 +0100
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References: <BANLkTinhaEVLub3uu64PWWT1ZyZK6ooQyA@mail.gmail.com>	<4D9DF55E.90407@freenet.de> <BANLkTim_PEmKjb8GSf3f1C0F+4QEgTZ2zQ@mail.gmail.com>
In-Reply-To: <BANLkTim_PEmKjb8GSf3f1C0F+4QEgTZ2zQ@mail.gmail.com>
Subject: Re: LF: VLF QRM puzzle - why not the same in a split screen on SL?
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OK Roger

Yep it surprises when you see it. I will start the 600 widow grabbing 
again now, Just a bit higher and we see how clean it is. There is 
nothing better than a tractical demifasion.:-)

Marcus if we move they will only follow us:-)

73 Eddie

On 07/04/2011 19:17, Roger Lapthorn wrote:
> Thanks to everyone (Wolf, Eddie, Marcus etc) for replying to my question.
>
> Eddie, yes I have seen the trace and how quickly going HF a few Hz the 
> interfering signals disappear. I was just a bit afraid that for some 
> reason the top window was less sensitive, but this seems unlikely to 
> be the case.
>
> 73s
> Roger G3XBM
>
> On 7 April 2011 18:33, wolf_dl4yhf <dl4yhf@freenet.de 
> <mailto:dl4yhf@freenet.de>> wrote:
>
>     Hi Roger,
>
>     Guess the burst originates from a periodic signal (maybe something
>     rich in harmonics), and one of the harmonics is closer to one of
>     the frequency ranges than the other. Or.. the two bands are fed
>     from two different sources - one before, and the other after the
>     noise blanker, or clipper ? You can quickly check that in the
>     'circuit' window. But if you say it's just the split screen mode,
>     then the two frequency ranges are indeed fed from the same FFT.
>
>     All the best,
>      Wolf .
>
>
>     Am 07.04.2011 18:09, schrieb Roger Lapthorn:
>
>         Help...
>
>         After lunch today my wife turned on the washing machine and
>         the tumble drier and for two periods there was a burst of
>         interference visible on the lower split screen as vertical
>         noise stripes. What I don't understand is why I don't see
>         these also on the upper trace around 8.976kHz too when the
>         settings are the same.  I have a SL filter selected but it is
>         centred around 8.970kHz with 400Hz width and slopes so this
>         cannot explain this. Surely the noise bursts should appear in
>         both parts of the screen?
>
>         Can someone who understands Spectrum Lab explain this please?
>
>         73s
>         Roger G3XBM
>
>
>
>
>
>
> -- 
> http://g3xbm-qrp.blogspot.com/
> http://www.g3xbm.co.uk
> http://www.youtube.com/user/g3xbm
> https://sites.google.com/site/sub9khz/
>


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    OK Roger<br>
    <br>
    Yep it surprises when you see it. I will start the 600 widow
    grabbing again now, Just a bit higher and we see how clean it is.
    There is nothing better than a tractical demifasion.<span        class="moz-smiley-s1"><span> :-) </span></span><br>
    <br>
    Marcus if we move they will only follow us<span        class="moz-smiley-s1"><span> :-) </span></span><br>
    <br>
    73 Eddie<br>
    <br>
    On 07/04/2011 19:17, Roger Lapthorn wrote:
    <blockquote        cite="mid:BANLkTim_PEmKjb8GSf3f1C0F+4QEgTZ2zQ@mail.gmail.com"        type="cite">Thanks to everyone (Wolf, Eddie, Marcus etc) for
      replying to my question. <br>
      <br>
      Eddie, yes I have seen the trace and how quickly going HF a few Hz
      the interfering signals disappear. I was just a bit afraid that
      for some reason the top window was less sensitive, but this seems
      unlikely to be the case. <br>
      <br>
      73s<br>
      Roger G3XBM<br>
      <br>
      <div class="gmail_quote">On 7 April 2011 18:33, wolf_dl4yhf <span            dir="ltr">&lt;<a moz-do-not-send="true"              href="mailto:dl4yhf@freenet.de">dl4yhf@freenet.de</a>&gt;</span>
        wrote:<br>
        <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt            0.8ex; border-left: 1px solid rgb(204, 204, 204);            padding-left: 1ex;">
          Hi Roger,<br>
          <br>
          Guess the burst originates from a periodic signal (maybe
          something rich in harmonics), and one of the harmonics is
          closer to one of the frequency ranges than the other. Or.. the
          two bands are fed from two different sources - one before, and
          the other after the noise blanker, or clipper ? You can
          quickly check that in the 'circuit' window. But if you say
          it's just the split screen mode, then the two frequency ranges
          are indeed fed from the same FFT.<br>
          <br>
          All the best,<br>
          &nbsp;Wolf .<br>
          <br>
          <br>
          Am 07.04.2011 18:09, schrieb Roger Lapthorn:
          <div>
            <div class="h5"><br>
              <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt                  0.8ex; border-left: 1px solid rgb(204, 204, 204);                  padding-left: 1ex;">
                Help...<br>
                <br>
                After lunch today my wife turned on the washing machine
                and the tumble drier and for two periods there was a
                burst of interference visible on the lower split screen
                as vertical noise stripes. What I don't understand is
                why I don't see these also on the upper trace around
                8.976kHz too when the settings are the same. &nbsp;I have a
                SL filter selected but it is centred around 8.970kHz
                with 400Hz width and slopes so this cannot explain this.
                Surely the noise bursts should appear in both parts of
                the screen?<br>
                <br>
                Can someone who understands Spectrum Lab explain this
                please?<br>
                <br>
                73s<br>
                Roger G3XBM<br>
              </blockquote>
              <br>
              <br>
            </div>
          </div>
        </blockquote>
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      <br>
      <br clear="all">
      <br>
      -- <br>
      <a moz-do-not-send="true" href="http://g3xbm-qrp.blogspot.com/"          target="_blank">http://g3xbm-qrp.blogspot.com/</a><br>
      <a moz-do-not-send="true" href="http://www.g3xbm.co.uk"          target="_blank">http://www.g3xbm.co.uk</a><br>
      <a moz-do-not-send="true" href="http://www.youtube.com/user/g3xbm"          target="_blank">http://www.youtube.com/user/g3xbm</a><br>
      <a moz-do-not-send="true"          href="https://sites.google.com/site/sub9khz/" target="_blank">https://sites.google.com/site/sub9khz/</a><br>
      <br>
    </blockquote>
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