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. While this tutorial is aimed at the RTL-SDR, other software radios such as the Funcube dongle, Airspy, HackRF and BladeRF will also work. Hardware radios with discriminator taps connected to a PC may also work.
Dsd P25 Decoder Software Download
There are two different version of DSD that need to be mentioned. There is DSD 1.7 which is open source software that is under active development and there is DSD+ which is closed source software. DSD+ has vastly superior decoding especially for weak signals but it cannot yet decode D-STAR. DSD 1.7 has poorer decoding, but it is capable of decoding D-STAR. To download each version of DSD see the links below. Once downloaded extract the contents zip file to a folder on your PC.
DSD+ can also be used to decode LRRP signals from Motorola (MOTOTRBO/DMR) radio signals. Some Motorola radio broadcast GPS coordinates every few minutes or on request. This is useful for tracking a fleet of vehicles for instance. To show decoded LRRP coordinates on a map when using DSD+, simply open LRRP.exe. Note that many LRRP radio users use a third party GPS software system which cannot be decoded by DSD+. If you do not see any coordinates in the DSD+ event log when an LRRP event occurs this may be the case.
We can set up a digital trunking radio scanner using these tools, two RTL-SDR dongles and another piece of software called Unitrunker. See our Unitrunker Trunking tutorial for information on setting this up.
DSD is essentially experimental software that is still under heavy development, so they are probably not focusing on creating simple user interfaces at the moment. That said, to run the latest version of DSD+ all you really need to do is double click on the .exe file.
Cygwin virus ridden as torjans Win32/Heur & Win32/DH discovered after scans hidden in compressed download & exe file from mirror during installation. Please avoid! Please be careful of mirrors during installation.
Hello. Here is a screenshot of DSD160 scrolling, but so sound. All my settings are correct as far as my soundcard settings, etc. Can you tell from this DOS screenshot if anything is out of the ordinary? Frustrating because the software definitely hears the channel and scrolls, but again no sound decoded. [IMG] [/IMG]
Hmmmm the last troubleshooting things I can think of are to 1) double check volume settings for VAC/stereo mix are set loud enough, 2) Download a free audio editor like Audacity and set the record input to VAC/stereo mix and see what audio is actually being piped through. 3) Ask more people on the Reddit RTLSDR board, or the radio reference digital decoding forum -voice-decoding-software/.
Hi, It looks as though just yesterday cygwin was updated and split into a 32-bit version and a 64-bit version. DSD is probably a 32-bit program so try downloading the 32-bit version of cygwin and using the 32-bit version of cygwin1.dll.
Digital Speech Decoder is an open source software package that decodes severaldigital speech formats. It uses the mbelib library (a separate open source package)to synthesize the decoded digital speech. It does not allow decoding of encryptedcommunications. It can save the compressed digital audio bits to "mbe" data files(.imb and .amb extensions) and play back those saved files. It's discussed in this forum.
While DSD was intended to be patent-free, mbelib describes functions thatmay be covered by one or more U.S. patents owned by DVSI Inc. The source code itself shouldnot be infringing as it merely describes possible methods of implementation.Compiling or using mbelib may infringe on patents rights and/or require licensing.It is unknown if DVSI will sell licenses for software that uses mbelib. If you donot have a license and are in a jurisdiction protected by the DVSI patents you shouldnot compile or use this source code.
Over on rtl-sdr.ru programmer Vasili has released his latest SDR# plugin which is a dPMR decoder (note that this site is in Russian). dPMR is short for "Digital Private Mobile Radio" and is an open non-proprietary digital voice protocol. Vasili writes:
Over on Twitter Annunaki (@StupotSinders) has been teasing some screenshots of a GUI for DSD+ that he's been developing over the past few weeks. And now he has released the software which is called "DSDPlusUI". DSD+ is mostly command line based, so a GUI could be useful for newbies. The software can be downloaded from the DSDPlusUI groups.io page.
DSD+ (aka Digital Speech Decoder) is a free closed source program that is compatible with RTL-SDR and various other SDRs which is used to decoder digital speech protocols such as P25 P1, DMR, NXDN and more. DSD+ Fastlane is a paid upgrade which allows subscribers to receive the latest updates to the software early.
At the end of last month we uploaded a post highlighting the SDRAngel software, which is a general purpose SDR program with some interesting features such as built in digital speech decoders for DMR, D-Star and Fusion. This avoids the need to pipe audio into a separate digital speech decoder program such as DSD+. SDRAngel also has transmit capabilities which makes it useful for SDRs such as the HackRF, PlutoSDR, LimeSDR etc.
Last week we posted about how Matthew Miller deomnstrated that he was able to get the Windows digital speech decoder (DSD+) software running under OSX with WineSkin. DSD+ allows you to decode digital voice signals such as P25 and Motorola DMR. A few users asked how to actually use WineSkin to create a wrapper, so now Matthew has uploaded a new tutorial video showing how to use WineSkin to get DSD+ running on OSX.
DSD+ stands for Digital Speech Decoder Plus and is a software program that can allow you to decode digital voice signals such as P25 and MotoTRBO/DMR. DSD+ is under continual development, and in their last public update they began offering early access to the latest DSD+ features in development through their fast lane subscription. The fast lane subscription costs $10 USD for one year and $25 for unlimited early access. Information about joining the fast lane service can be found in the readme file of the latest DSD+ 1.074 public release.
Over on YouTube user John Miller has been testing the latest early access version DSD+ 1.08t. This new version adds trunking support which allows you to follow conversations. Previously other software like Unitrunker was required to follow the trunking signal. On YouTube John has uploaded a video first showing trunking in action, and a second video showing how to set up DSD+ 1.08t for trunking.
First and foremost. I am doing these experiments on Xubuntu 14.04.1 LTS. There are prebuilt binaries for Windows, which I will also be trying. Early versions of the software two-part; a program to run an RTL SDR and another program to decode the digital speech. Videos show people using the discriminator tap of FT817 receivers to feed data into a sound-card, so we see how that will work too.
Advanced decoder options:-A QPSK modulation auto detection threshold (default=26)-S Symbol buffer size for QPSK decision point tracking(default=36)-M Min/Max buffer size for QPSK decision point tracking(default=15)$
For various reasons, it is convenient to avoid using GQRX. When using the Raspberry Pi, or other embedded device, commands like rtl_fm are able to provide samples out as with socat connected to GQRX, but without the software library requirements of GQRX and the graphics and overhead. Another big plus is avoiding compiling GNURadio on the Raspberry Pi, which doesn take some years ? 2ff7e9595c
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