Here I show you how to decoce P25 Phase 1 audio using an RTL SDR and SDRSharp with DSD Plus, VB Audio Cable and Zadig.
Mine is the RTL 2832.
Links:
SDRSharp http://airspy.com/download/ Under Core Tools - Download SDR Software Package (Chasnge log)
DSDPlus 1.101 and DSDPlus 1.101 DLL Package https://www.dsdplus.com/download-2/ Click Download at the top of the page - Download DSDPlus 1.101 and DSDPlus 1.101 DLL Package
VB Audio Cable http://vb-audio.pagesperso-orange.fr/Cable/ Scroll down to INSTALL VB-CABLE Virutal Audio Device and click the big orange Download button
Zadig Drivers http://zadig.akeo.ie/ Scroll down to Download - Click Zadig for Windows Vista or later
General search for RTL SDR on eBay.Com http://www.ebay.com/sch/i.html?_from=R40&_trksid=p2050601.m570.l1313.TR12.TRC2.A0.H0.XRTL+SDR.TRS0&_nkw=RTL+SDR&_sacat=0