This article has screen shots from the 4.08/4.8 version of VAC There are several steps involved in getting VAC installed and working properly with PowerSDR. Also, screens change significantly from sub-release to sub release, so the ones shown may not be exactly what is the most current. His software which is labeled 4.08 on his web site comes up as 4.8 in the program's About menu. Configuring VAC 4.0x Note: The program's developer, Eugene has introduced a problem in his version control. You can get information from the VAC Home Page. VAC is written and maintained by Eugene Muzychenko. This allows the user to setup and control the audio parameters of VAC directly from the PowerSDR console. PowerSDR version 1.6.0 (and above) has native support for VAC when using the DRM or DIGIx modes. WDM/KS Audio technology native for Windows 2k/XP/2k3. PCM format conversion between clients on either end of the VAC cable. Signal mixing (with saturation) between output port clients. Almost no sound latency with maximal interrupt frequency. Floating point formats are not supported. Almost any of fixed point PCM audio formats (200.1000000 samples per second, 8.32 bits per sample, 1.8 channels). Some of the new enhancements are: - 1.20 milliseconds per interrupt. VAC version 4.0x is an upgraded version from 3.12. A computer PCI, Firewire or USB slot is not used. There are no external cables to degrade the sound quality or possibly pick up RFI. The entire audio stream is maintained in the digital domain - there is no multiple conversions of the signal from digital to analog and from analog to digital. There are some significant advantages to using VAC over a second sound card. How to Setup Virtual Audio Cable (VAC) 4.0x with PowerSDR 1.x How to Setup Virtual Audio Cable (VAC) 4.0x with PowerSDR 1.x System Dependencies Minimum PowerSDR Version: 1.6.0 Applicable Hardware: All transceivers Content provided by: FlexRadio Systems Engineering & Tim W4TME Virtual Audio Cable (VAC) is a third-party software program that allows the rerouting and the emulation of a sound card in software rather than having to use a second sound card for audio analysis or use with digital mode programs such as MixW and WSJT.
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