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Date: Wed, 25 Apr 2012 13:54:46 +0100
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Subject: Re: LF: Generating 8970 Hz carrier with Spectrum Lab ?
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Hi Stefan

The expert has arrived, we knew it was simple:-)

When you TX on 8.9kHz again will it be on a preferred frequency of yours 
which you can tell me now? If so what will it be please.

73 Eddie

On 25/04/2012 13:10, Stefan Schäfer wrote:
> Hi Peter,
>
> Am 25.04.2012 11:12, schrieb PA1SDB, Peter:
>> Hello VLF,
>> I like to do some local test here with Spectrum lab setings (and who 
>> knows, High ERP transmissions later  :-)
>> I have here a notebook that generates a signal with the Signal 
>> generator in Spectrum Lab at 8970.1 Hz.
>> It has a Loop connected at the input and thats how it is locked to a 
>> GDO (HWU, FTA, what is available)
>> I tried several, and that Lock wondow gets green, but output looks 
>> terrible.
>> To radiate the signal I use a pice of wire at the notebook LS output.
>> Below two grab's over the same periode of time.
>> My localy generated signal at 8970.100 Hz and for comparison the 
>> signal of DJ8WX at 8970.022 Hertz.
>> Both grab's are made with the same Spectrum Lab task.
>> Why does my signal look like a widband FM transmission ?
>
> That can happen when multiple phase glitches occur on the PC, sound 
> output. Try to use a different sample rate, maybe 44100 instead of 48000.
> Try to run SL exclusively, i.e. no other programs and internet usage 
> (everthing that may take a high CPU load) and see if it makes a 
> difference.
> The signal of DJ8WX is clear. That reduces the possible errors...
>
> 73, Stefan/DK7FC
>
> No virus found in this message.
> Checked by AVG - www.avg.com <http://www.avg.com>
> Version: 2012.0.1913 / Virus Database: 2411/4957 - Release Date: 04/24/12
>


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    Hi Stefan<br>
    <br>
    The expert has arrived, we knew it was simple<span
      class="moz-smiley-s1"><span> :-) </span></span><br>
    <br>
    When you TX on 8.9kHz again will it be on a preferred frequency of
    yours which you can tell me now? If so what will it be please.<br>
    <br>
    73 Eddie<br>
    <br>
    On 25/04/2012 13:10, Stefan Sch&auml;fer wrote:
    <blockquote cite="mid:4F97E9C2.9030000@iup.uni-heidelberg.de"
      type="cite">
      <meta content="text/html; charset=ISO-8859-1"
        http-equiv="Content-Type">
      Hi Peter, <br>
      <br>
      Am 25.04.2012 11:12, schrieb PA1SDB, Peter:
      <blockquote cite="mid:FB72BFCD7B564064B0C93A0FD2DA9448@Extensa"
        type="cite">
        <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="Georgia">Hello VLF,</font></div>
        <div><font face="Georgia">I like to do some local test here with
            Spectrum lab setings (and who knows, High ERP transmissions
            later&nbsp; :-)</font></div>
        <div><font face="Georgia">I have here a notebook that generates
            a
            signal with the Signal generator in Spectrum Lab at 8970.1
            Hz.</font></div>
        <div><font face="Georgia">It has a Loop connected at the input
            and
            thats how it is locked to a GDO (HWU, FTA, what&nbsp;is
            available)</font></div>
        <div><font face="Georgia">I tried several, and that Lock wondow
            gets
            green, but output looks terrible.</font></div>
        <div><font face="Georgia">To radiate the signal I use a pice of
            wire
            at the notebook LS&nbsp;output.</font></div>
        <div>&nbsp;</div>
        <div><font face="Georgia">Below two grab's over the same periode
            of
            time.</font></div>
        <div><font face="Georgia">My localy generated signal at 8970.100
            Hz
            and for comparison the signal of DJ8WX at 8970.022 Hertz.</font></div>
        <div>&nbsp;</div>
        <div><font face="Georgia">Both grab's are made with the same
            Spectrum
            Lab task.</font></div>
        <div>&nbsp;</div>
        <div><font face="Georgia">Why does my signal look like a widband
            FM
            transmission ?</font></div>
      </blockquote>
      <br>
      That can happen when multiple phase glitches occur on the PC,
      sound
      output. Try to use a different sample rate, maybe 44100 instead of
      48000.<br>
      Try to run SL exclusively, i.e. no other programs and internet
      usage
      (everthing that may take a high CPU load) and see if it makes a
      difference.<br>
      The signal of DJ8WX is clear. That reduces the possible errors...<br>
      <br>
      73, Stefan/DK7FC<br>
      <p class="" avgcert""="" color="#000000" align="left">No virus
        found in this message.<br>
        Checked by AVG - <a moz-do-not-send="true"
          href="http://www.avg.com">www.avg.com</a><br>
        Version: 2012.0.1913 / Virus Database: 2411/4957 - Release Date:
        04/24/12</p>
    </blockquote>
    <br>
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