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 thesound card input to "Virtual Cable 2" and the output to "Virtual Cable 1". Below is an example ofhow MixW is configured. Note that the sampling rate does not match what was setup inPowerSDR - This asymmetric configuration seems to provide the best audio quality and the fewestaudio drop outs.Figure 5 - MixW Sound Device SettingsStep 9. After you have the sound card program's audio input and output set, you should startobserving audio either by hearing it or watching it on a spectrum display such as a waterfall. Youcan verify the VAC channel for the client program is active by looking at the VAC control panel.Figure 6 - VAC Control Panel with MixW receivingNotice that the value in the RcStream for Cable 2 has changed for a 0 (zero) to a 1 (one). Thisindicates 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 aone (1) until you are transmitting using the sound card program and MixW is sending audiothrough that cable.Figure 7 - VAC Control Panel with MixW TransmittingStep 10. At this point you have completed the set up of VAC 4.0x with a sound card program.This KB article may reference additional files that are available on the FlexRadio Systems web siteDownloads page. Please use the URL(s) below to download the referenced materials.An Adobe Acrobat Reader may be required to open the file. You can download Adobe Acrobatfrom here.KB Source Document(s):NoneReferencedLast Modified By: Administrator, Sunday, October 19, 2008http://kc.flex-radio.com/KnowledgebaseArticle50230.aspxFriday, September 11, 2009