[aprssig] FW: Tuning a TNC

[Stephen H. Smith]

  On 8/24/2010 9:45 AM, Robert Bruninga wrote:
> 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.
>

There is a very simple and FREE app for this on my website.

Go to <http;//wa8lmf.net/miscinfo>

Scroll down the list of downloadable stuff and look for WaveTools.exe 
<http://wa8lmf.net/miscinfo/WaveTools.exe>  .

Right-click and download this self-extracting archive of 4 audio applets for 
your sound card.

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.

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:

<http://wa8lmf.net/ham/imic.htm>

which provides a stereo low-level MIC input.

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.


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