There are two different version of DSD that need to be mentioned. If not, see the Buy RTL-SDR, and Quickstart pages first before attempting this tutorial. It is assumed you have an RTL-SDR dongle set up and working with SDRSharp. Tutorial – Decoding Digital Voice using SDRSharp, DSD and RTL-SDR (For Windows) YouTube user Geoff Wolf shows a video where he uses RTL-SDR as a police scanner to listen to public safety P25 digital radio using DSD, SDRSharp and virtual audio cable. Examples of DSD Decoding Digital Voice with RTL-SDR as a Radio Scanner Hardware radios with discriminator taps connected to a PC may also work. While this tutorial is aimed at the RTL-SDR, other software radios such as the Funcube dongle, Airspy, HackRF and BladeRF will also work. Super cheap software defined radios such as the RTL-SDR can be used to decode these digital voice communication signals instead of expensive radio scanners. DSD is also capable of decoding other common digital codecs such as DMR/MOTOTRBO, NXDN, D-STAR and ProVoice. The most common digital speech codec is APCO P25, which DSD is able to decode. However, most users of digital radio do not bother to encrypt their systems as it can introduce lag, monetary expense and extra battery drain in portable radios. Additionally, digital radio systems can be encrypted making it impossible for communications to be decoded by a hobbyist. This is due to the various improvements offered over traditional analogue voice radio systems. Unfortunately for radio scanner hobbyists, digital radio is difficult to receive, as special radio scanners which can be expensive are required to decode the digital signal. The RTL-SDR software defined radio combined with SDRSharp and a program called “digital speech decoder” (DSD) can be used as a radio scanner to easily and cheaply listen to unencrypted digital radio voice conversations.ĭigital radio voice communications are becoming more commonly used in the radio spectrum.
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