Message-ID: <4E173E8F.5020804@freenet.de>
Date: Fri, 08 Jul 2011 19:29:51 +0200
From: wolf_dl4yhf <dl4yhf@freenet.de>
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In-Reply-To: <649889E567714A0393C8D5B0ABB27E5C@acer>
Subject: Re: LF: Speclab
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Hello Henny,

If you turn down the gain of the 'output amplifier' in the circuit 
window, does the sound from the soundcard disappear (it should) ?

If not, I guess it's the old 'mixer' problem again - many soundcards are 
configured to route the input (from the "line in" jack) directly to the 
output ("line out"). SL doesn't touch any of the soundcard settings, so 
you need to find the right control (slider, or mute option) in the 
soundcard's audio volume control panel (sndvol32, or whatever program 
came along with the soundcard).

The effect of the hum filter should be easily audible, because that's 
what it was designed for. Btw for 'natural radio' listening, the 
FFT-based automatic multi-notch filter is preferred over the old hum 
filter (=comb filter).

All the best,
    Wolf DL4YHF .

P.S: If you post your question on the SL User's group, and mention the 
model of your soundcard, other users may be able to help.
The group's site is http://tech.groups.yahoo.com/group/SpectrumLabUsers/ .



Am 08.07.2011 14:28, schrieb henny van elst:
> Hello Wolf,
> maby you can help me out with a problem I have with Speclab.I am using 
> speclab to listen to sferics and whistlers.In the components window I 
> can enable the humfilter ,the effect is very clearly visible on the 
> spectrogram,but I can,t hear the difference on the speaker.Am I 
> forgetting something or is it just not possible on some old 
> soundcards.It works well on my desktop...Many thank in advance,
> 73
> Henny
> CPM..........


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    Hello Henny,<br>
    <br>
    If you turn down the gain of the 'output amplifier' in the circuit
    window, does the sound from the soundcard disappear (it should) ?<br>
    <br>
    If not, I guess it's the old 'mixer' problem again - many soundcards
    are configured to route the input (from the "line in" jack) directly
    to the output ("line out"). SL doesn't touch any of the soundcard
    settings, so you need to find the right control (slider, or mute
    option) in the soundcard's audio volume control panel (sndvol32, or
    whatever program came along with the soundcard). <br>
    <br>
    The effect of the hum filter should be easily audible, because
    that's what it was designed for. Btw for 'natural radio' listening,
    the FFT-based automatic multi-notch filter is preferred over the old
    hum filter (=comb filter).<br>
    <br>
    All the best,<br>
    &nbsp;&nbsp; Wolf DL4YHF .<br>
    <br>
    P.S: If you post your question on the SL User's group, and mention
    the model of your soundcard, other users may be able to help.<br>
    The group's site is
    <a class="moz-txt-link-freetext" href="http://tech.groups.yahoo.com/group/SpectrumLabUsers/">http://tech.groups.yahoo.com/group/SpectrumLabUsers/</a> .<br>
    <br>
    <br>
    <br>
    Am 08.07.2011 14:28, schrieb henny van elst:
    <blockquote cite="mid:649889E567714A0393C8D5B0ABB27E5C@acer"
      type="cite">
      <title></title>
      <meta content="text/html; charset=ISO-8859-1"
        http-equiv="Content-Type">
      <meta name="GENERATOR" content="MSHTML 8.00.6001.19088">
      <style></style>
      <div><font face="Arial" size="2">Hello Wolf,</font></div>
      <div>&nbsp;</div>
      <div><font face="Arial" size="2">maby you can help me out with a
          problem&nbsp;I have with Speclab.I am using speclab to listen to
          sferics and whistlers.In the components window I can enable
          the humfilter ,the effect is very clearly visible on the
          spectrogram,but I can,t hear the difference on the speaker.Am
          I forgetting something or is it just not possible on some old
          soundcards.It works well on my desktop...Many thank in
          advance,</font></div>
      <div>&nbsp;</div>
      <div><font face="Arial" size="2">73</font></div>
      <div>&nbsp;</div>
      <div>&nbsp;</div>
      <div><font face="Arial" size="2">Henny</font></div>
      <div><font face="Arial" size="2">CPM..........</font></div>
    </blockquote>
    <br>
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