How to Setup Virtual Audio Cable (VAC) 4.0x with PowerSDR 1.x ...

In your sound card program's setup for which sound card you are using, you will need to set the
sound card input to "Virtual Cable 2" and the output to "Virtual Cable 1". Below is an example of
how MixW is configured. Note that the sampling rate does not match what was setup in
PowerSDR - This asymmetric configuration seems to provide the best audio quality and the fewest
audio drop outs.
Figure 5 - MixW Sound Device Settings
Step 9. After you have the sound card program's audio input and output set, you should start
observing audio either by hearing it or watching it on a spectrum display such as a waterfall. You
can verify the VAC channel for the client program is active by looking at the VAC control panel.
Figure 6 - VAC Control Panel with MixW receiving
Notice that the value in the RcStream for Cable 2 has changed for a 0 (zero) to a 1 (one). This
indicates that cable 2, which is the input for MixW is actively receiving audio from PowerSDR.
Note: The Pb Stream value for VAC audio cable 1 is still 0 (zero). This will not change to a
one (1) until you are transmitting using the sound card program and MixW is sending audio
through that cable.
Figure 7 - VAC Control Panel with MixW Transmitting
Step 10. At this point you have completed the set up of VAC 4.0x with a sound card program.
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Last Modified By: Administrator, Sunday, October 19, 2008
http://kc.flex-radio.com/KnowledgebaseArticle50230.aspx
Tuesday, September 22, 2009