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Using Virtual Audio Cable (VAC) with an SDR


It's Easier Than You think

Virtual Audio Cable

As many of you know, I do love my hardware receivers. But I love the possibilities of Software-Defined Radios (SDR) too, especially because of the many ways in which you can filter, visualise and condition the signal. Under the influence of the writings of some of our regular RadioUser contributors, I tried connecting an SDR to some third-party software last weekend, using VAC – Virtual Audio Cable. Nothing could have been easier. I downloaded VAC from here (there are other alternatives, of course):

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Then, it was just a matter of starting the third-party software – in my case a weather fax decoder – and tinkering in the SDR until the signal was received satisfactorily. I used an SDRPlay RSPdx and an AirSpy HF+ Discovery and my Wellbrook 1530 loop to pull in both WEFAX and RTTY, and I was more than happy with the results. With a different aerial setup, you could imagine going portable too – oh well, perhaps not now, but something to look forward too again soon.