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On 8/24/2010 9:45 AM, Robert Bruninga wrote:
<blockquote
cite="mid:6E90522BC21E456E8E4744129518E8B2@ewlab.usna.edu"
type="cite">
<pre wrap="">With today's sound cards in every PC, surely there is a free
O-Scope display. If so, then there is no excuse for any ham to
not use this tool for cleaning up some of the trash we see on
144.39.
</pre>
</blockquote>
<br>
There is a very simple and FREE app for this on my website. <br>
<br>
Go to <http;//wa8lmf.net/miscinfo> <br>
<br>
Scroll down the list of downloadable stuff and look for <font
face="Verdana"><a href="http://wa8lmf.net/miscinfo/WaveTools.exe">WaveTools.exe</a>
. <br>
<br>
Right-click and download this self-extracting archive of 4 audio
applets for your sound card. <br>
<br>
Four separate small programs turn your sound card into a
dual-trace audio scope -or- a sine/triangle/square-wave audio
generator -or- a volume-unit meter -or- an audio spectrum analyzer
switchable between a linear and log scale. <br>
<br>
Note that the dual-trace scope function requires that you have a
stereo input sound system -- most computer MIC inputs are MONO.
If the machine has a LINE level input, it will be stereo. Or use
the inexpensive USB-connected "iMic" external audio system
described here:<br>
<br>
<a class="moz-txt-link-rfc2396E" href="http://wa8lmf.net/ham/imic.htm"><http://wa8lmf.net/ham/imic.htm></a> <br>
<br>
which provides a stereo low-level MIC input. <br>
<br>
I've used WaveTools in the field with my mobile laptop connected
to the mini-DIN "data" jack output of my D700's discriminator
output many many times to troubleshoot packet audio issues. <br>
<br>
<br>
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