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Date: Sun, 29 Dec 2013 19:50:37 +0100
From: wolf_dl4yhf <dl4yhf@freenet.de>
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Subject: Re: LF: VLF exciter / signal generation in Spectrum Lab
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Hi Graham,

About 74 kHz reception: I recently discovered that a Lenovo 'X61s' 
netbook, bought cheaply at a rally, supports true 192 kHz sampling with 
the onboard 'soundcard' (once one discovers where to configure that in 
the swamped windows 7 system control, or wherever they decided to put 
the soundcard control dialog today. IIRC it was "Properties of 
Microphone", translated from german into english).
Indeed the usable 'audio' range covers a few Hz to 96 kHz ! This would 
allow direct reception on 74 kHz, and also using DCF77, MSF, or similar 
time signal transmitters as reference for the sample rate correction...  
SL could translate down into the audible range, and downsample to 48 or 
24 kS/second, before sending the converted signal to other applications.

Anyway it would be much easier if the "hard coded frequency range" would 
simply be removed from the original Opera software, and completely leave 
it to the human operator to enter the frequency range in a simple input 
field.

73,
   Wolf .


Am 29.12.2013 18:56, schrieb Graham:
> Thanks Wolf,
> With the 8K signals  out side  the  Op decoder  , some users  wanted  
> to  monitor the  test  , but  needed  a  way of changing the  qrg  
> slightly to  match ,
> The  other  thing , that  occurred  to  me  , was  the  other 75 K 
> stations  , may have a  TA chance  using  Op4H , +6 dB gain over op1H  
>  in the  'window'  time ,  may be  1  run or  2  max ? ... recovering  
> the  8K audio  may  be a  problem ,  my ra6790gm   has a  locked bfo  
> range  of  +/-  19KHz or  so  , but  , for  normal  ssb-rx  , then  a  
> shift  up from  1500 would be  needed [ may even  catch Bob  on 4H  hihi]
> 73-G,
>
> *From:* wolf_dl4yhf <mailto:dl4yhf@freenet.de>
> *Sent:* Sunday, December 29, 2013 1:25 PM
> *To:* rsgb_lf_group@blacksheep.org <mailto:rsgb_lf_group@blacksheep.org>
> *Subject:* Re: LF: VLF exciter / signal generation in Spectrum Lab
>
> Hello Graham,
>
> Am 29.12.2013 14:04, schrieb Graham:
>> Wolf,
>> Q How to  configure  SL  as audio  frequency   changer ?
>> say   1500 Hz to  8 KHz , or , 8100 to  8200   etc
>> how is the  set  up  ?
>
> The easiest way is using the 'narrowband filter', which can also shift 
> frequencies.
> Start by selecting 'Quick Settings' in the menu, then 'Other amateur 
> radio modes', 'Narrow CW filter with adjustable xyz'. You can see the 
> filter's passband on the main frequency scale, along with the 'zero 
> beat' indicator similar to a web sdr. Grab the passband widh the mouse 
> and move it to the 'source' frequency range. Alternatively, enter the 
> frequency shift in numeric form on the filter control panel. Details:
>
> http://www.qsl.net/dl4yhf/speclab/filters.htm#filter_controls_on_main_freq_scale
>
>
>> will SL  appeared as a  sound  source  ?
> It can, but unfortunately only as an ASIO device. Microsoft's 
> ever-changing driver model is so utterly complex that I gave up 
> writing my own 'multimedia driver'. Also I didn't feel like 
> re-inventing the wheel for XP, Vista, Win7, Win8, and 
> whatever-comes-next...  :o)  Thus the easiest (??) method would be to 
> use Virtual Audio Cable.
>
> The more complex (but VAC-less) way, if ASIO is supported by the 
> audio-receiving application, is decribed in the 'Audio I/O' manual:
>
> http://www.qsl.net/dl4yhf/AudioIO/AudioIO_Manual.pdf
>
> The relevant chapter would be "Installation of in_AudioIO.dll as an 
> ASIO device".
>
>
>
> Now back to the soldering iron..
>
> 73,  Wolf .
>
>


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    <div class="moz-cite-prefix">Hi Graham,<br>
      <br>
      About 74 kHz reception: I recently discovered that a Lenovo 'X61s'
      netbook, bought cheaply at a rally, supports true 192 kHz sampling
      with the onboard 'soundcard' (once one discovers where to
      configure that in the swamped windows 7 system control, or
      wherever they decided to put the soundcard control dialog today.
      IIRC it was "Properties of Microphone", translated from german
      into english). <br>
      Indeed the usable 'audio' range covers a few Hz to 96 kHz ! This
      would allow direct reception on 74 kHz, and also using DCF77, MSF,
      or similar time signal transmitters as reference for the sample
      rate correction...&nbsp; SL could translate down into the audible
      range, and downsample to 48 or 24 kS/second, before sending the
      converted signal to other applications.<br>
      <br>
      Anyway it would be much easier if the "hard coded frequency range"
      would simply be removed from the original Opera software, and
      completely leave it to the human operator to enter the frequency
      range in a simple input field.<br>
      <br>
      73,<br>
      &nbsp; Wolf .<br>
      <br>
      <br>
      Am 29.12.2013 18:56, schrieb Graham:<br>
    </div>
    <blockquote cite="mid:D8D318AC893C480791B6BCA081413A5F@AGB"
      type="cite">
      <meta content="text/html; charset=ISO-8859-1"
        http-equiv="Content-Type">
      <meta name="GENERATOR" content="MSHTML 8.00.6001.23543">
      <div>Thanks Wolf,</div>
      <div>&nbsp;</div>
      <div>With the 8K signals&nbsp; out side&nbsp; the&nbsp; Op decoder&nbsp; , some&nbsp;
        users&nbsp; wanted&nbsp; to&nbsp; monitor the&nbsp; test&nbsp; , but&nbsp; needed&nbsp; a&nbsp; way of&nbsp;
        changing the&nbsp; qrg&nbsp; slightly to&nbsp; match ,</div>
      <div>&nbsp;</div>
      <div>The&nbsp; other&nbsp; thing , that&nbsp; occurred&nbsp; to&nbsp; me &nbsp;, was&nbsp; the&nbsp; other
        75 K stations&nbsp; , may have a&nbsp; TA chance&nbsp; using&nbsp; Op4H&nbsp;, +6 dB gain
        over op1H&nbsp; &nbsp;in the&nbsp; 'window'&nbsp; time ,&nbsp; may be&nbsp; 1&nbsp; run or&nbsp; 2&nbsp; max&nbsp;
        ? ... recovering&nbsp; the&nbsp; 8K audio&nbsp; may&nbsp; be a&nbsp; problem ,&nbsp; my&nbsp;
        ra6790gm&nbsp;&nbsp; has a&nbsp; locked bfo&nbsp; range&nbsp; of&nbsp; +/-&nbsp; 19KHz or&nbsp; so&nbsp; ,
        but&nbsp; , for&nbsp; normal&nbsp; ssb-rx&nbsp; , then&nbsp; a&nbsp; shift&nbsp; up from&nbsp; 1500&nbsp;
        would be&nbsp; needed [ may even&nbsp; catch Bob&nbsp; on 4H&nbsp; hihi]</div>
      <div>&nbsp;</div>
      <div>73-G, </div>
      <div>&nbsp;</div>
      <div style="FONT: 10pt Tahoma">
        <div><br>
        </div>
        <div style="BACKGROUND: #f5f5f5">
          <div style="font-color: black"><b>From:</b> <a
              moz-do-not-send="true" title="dl4yhf@freenet.de"
              href="mailto:dl4yhf@freenet.de">wolf_dl4yhf</a> </div>
          <div><b>Sent:</b> Sunday, December 29, 2013 1:25 PM</div>
          <div><b>To:</b> <a moz-do-not-send="true"
              title="rsgb_lf_group@blacksheep.org"
              href="mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org</a>
          </div>
          <div><b>Subject:</b> Re: LF: VLF exciter / signal generation
            in Spectrum Lab</div>
        </div>
      </div>
      <div><br>
      </div>
      <div class="moz-cite-prefix">Hello Graham,<br>
        <br>
        Am 29.12.2013 14:04, schrieb Graham:<br>
      </div>
      <blockquote cite="mid:3C87189CFA294757996FC9163E49543E@AGB"
        type="cite">
        <meta name="GENERATOR" content="MSHTML 8.00.6001.23543">
        <div>Wolf,</div>
        <div>&nbsp;</div>
        <div>Q How to&nbsp; configure&nbsp; SL&nbsp; as&nbsp;audio &nbsp;frequency&nbsp;&nbsp; changer ?&nbsp;&nbsp;
        </div>
        <div>&nbsp;</div>
        <div>say&nbsp;&nbsp; 1500 Hz to&nbsp; 8 KHz , or , 8100 to&nbsp; 8200&nbsp;&nbsp; etc </div>
        <div>&nbsp;</div>
        <div>how is the&nbsp; set&nbsp; up&nbsp; ? <br>
        </div>
      </blockquote>
      <br>
      The easiest way is using the 'narrowband filter', which can also
      shift frequencies. <br>
      Start by selecting 'Quick Settings' in the menu, then 'Other
      amateur radio modes', 'Narrow CW filter with adjustable xyz'. You
      can see the filter's passband on the main frequency scale, along
      with the 'zero beat' indicator similar to a web sdr. Grab the
      passband widh the mouse and move it to the 'source' frequency
      range. Alternatively, enter the frequency shift in numeric form on
      the filter control panel. Details:<br>
      <br>
      <a moz-do-not-send="true" class="moz-txt-link-freetext"
href="http://www.qsl.net/dl4yhf/speclab/filters.htm#filter_controls_on_main_freq_scale">http://www.qsl.net/dl4yhf/speclab/filters.htm#filter_controls_on_main_freq_scale</a><br>
      <br>
      <br>
      <blockquote cite="mid:3C87189CFA294757996FC9163E49543E@AGB"
        type="cite">
        <div>&nbsp;</div>
        <div>&nbsp;</div>
        <div>will SL&nbsp; appeared as a&nbsp; sound&nbsp; source&nbsp; ?</div>
      </blockquote>
      It can, but unfortunately only as an ASIO device. Microsoft's
      ever-changing driver model is so utterly complex that I gave up
      writing my own 'multimedia driver'. Also I didn't feel like
      re-inventing the wheel for XP, Vista, Win7, Win8, and
      whatever-comes-next...&nbsp; :o)&nbsp; Thus the easiest (??) method would be
      to use Virtual Audio Cable.<br>
      <br>
      The more complex (but VAC-less) way, if ASIO is supported by the
      audio-receiving application, is decribed in the 'Audio I/O'
      manual:<br>
      <br>
      <a moz-do-not-send="true" class="moz-txt-link-freetext"
        href="http://www.qsl.net/dl4yhf/AudioIO/AudioIO_Manual.pdf">http://www.qsl.net/dl4yhf/AudioIO/AudioIO_Manual.pdf</a><br>
      <br>
      The relevant chapter would be "Installation of in_AudioIO.dll as
      an ASIO device".<br>
      <br>
      <br>
      <br>
      Now back to the soldering iron..<br>
      <br>
      73,&nbsp; Wolf .<br>
      <br>
      <br>
    </blockquote>
    <br>
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