Surprisingly, for being in the middle of boston im picking up a huge range of signals including ft8 and shortwave broadcasts. This tutorial covers a lot of information and has good links to youtube. P25 trunked tracking and decoding with rtlsdr, unitrunker, and dsdplus. Hardware the recommended hardware for this project. 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. Unitrunker update to support the new radio reference soap interface is now publically available. Uk radio scanning forum view topic dsd for windows 1. While both my wife and i have hp1s they stay mounted in the cars. Software like sdrtrunk and dsdplus can decode p25 phase 1, but at the moment the only software that is capable of decoding p25 phase 1 and 2 is a program called op25. Tutorial on setting up op25 for p25 phase 2 digital voice. Decoding apco p25 voice via discriminator tap on rs pro163 using digital speech decoder software.
Project 25 phase 2 tdma decoding in soft ware works over a year ago, i started worrying about what would become of my software based scanner site after the county built their new radio system. I get the basics that dsd allows you to monitor digital input and translates it to audio you can hear on your computer. If youve already calibrated your rtlsdr dongle and know the ppm offset, you can skip this section. There appears to be no changelog, so we are unsure as to what is new, but one obvious change is that they now include a new program called fmp which is a simple nfm demodulator, similar to. You need a very strong signal, and just the correct audio levels and settings. Install instructions how to install the current version of op25. Complete guide to digital speech decoder how to decode dmr, p25, nxdn in this simple guide to setting up dsd, i show what you will need, and how to get started, along with a few other bits of useful information that im sure will come in handy when listening to digital voice.
Rtl sdr setup p25 trunking using just one sdr and the dsdplus fastlane software. Need help setting up fast lane or importing aliasing and priority. Im now been told that is exclusive to p25 phase 1 decoding. My audio is not clipping, its simply a problem i cannot figure. Complete guide to digital speech decoder how to decode dmr, p25, nxdn complete guide to digital speech decoder how to decode dmr, p25, nxdn in this simple guide to setting up dsd, i show what you will need, and how to get started, along with a few other bits of useful information that im sure will come in handy when listening to digital voice. How to decode p25 using one rtlsdr dongle with dsd plus. I get a fmp tuner that displays a spectrum when there is voice activity and and i get one instance of dsd thats decoding audio and a dsd cc channel activity window that displays tx freq and talk groups. How to decode p25 using one rtlsdr dongle with dsd.
Decoding some moto trbo with the windows port of dsd digital speech decoder. Dsd and mbelib should compile on linux and bsd operating systems. There appears to be no changelog, so we are unsure as to what is new, but one obvious change is that they now include a new program called fmp which is. Following trunked radio with unitrunker the popular trunking decoding software unitrunker now supports the rtl2832u r820. I recommend that you listen with headphones or earphones to. Dsd is able to decode several digital voice formats from discriminator tap audio and synthesize the decoded speech. Fast lane updates are expected to be released about once per month. Cc control channel dsdplus e fa i20003 rc om nul just copy this fella as is. Updated the handling of neighbour network sites in p25 neighbor lists. Digital speech decoder is an open source software package that. Decoder a gnuradio program that turns a p25 signal into an audio and message stream. Dsd and mbelib can be downloaded from here see note at the end of this writeup.
Advanced decoder options fine tuning the advanced decoder options can greatly increase decoding. Decoding of harris patchsimulselect data has been added. Newer applications such as unitrunker, dsd and dsdplus dont require the use of a data slicer. Mbelib this software actually takes the decoded information and synthesizes it so you can hear the decoded audio. The latest public release version of the popular digital decoder software is v 1. Following trunked radio with unitrunker the popular trunking decoding software unitrunker now supports the rtl2832u. Does dsd fastlane offer any better decoding compared to the public. Download digital speech decoder and mbe library for free. In my video and previously in the directions for cc.
Rtl sdr setup p25 trunking with 1 sdr and dsdplus fastlane. The beginners guide to software defined radio rtlsdr duration. This idea was first asked on the batlabs message board in a thread about tims maxtrac p25 mods. A popular package currently under development is digital speech decoder dsd. Im trying to use dsdplus by itself to track and decode a p25 phase i fdma digital system. Sdrplay software defined radio receiver 23,184 views. When active, my scanners show rid 0 zero and pro96com shows no rid at all. The rtlsdr software defined radio combined with sdrsharp and a program. Software defined radio introduction what sdr to buy. Complete guide to digital speech decoder how to decode mototrbo, p25, nxdn. Im sure most of you have been in my position at one time, my head hurts since 2. Computersavvy hobbyists may wish to experiment with using computer software to monitor digital radio signals.
Dsd is also capable of decoding other common digital codecs such as dmrmototrbo, nxdn, dstar and provoice. Advanced decoder options are available to allow you to fine tune dsdplus for a particular site system transmitter that you are monitoring. Complete guide to digital speech decoder how to decode dmr, p25, nxdn. Is it as simple as feeding the program the over the air digital audio and allowing it to decode it. There are talkgroups that are patched from other radio systems. Decoding p25, digital speech decoder dsd guide, dsd 1. If ricks nac decoder included his source code it would be possible to add code to have the program change the logic status of a parallel printer or serial port pin on the computer which could be used for a cor input to a repeater controller. Under core tools download sdr software package chasnge log. Check the links below setup dsdplus fastlane with trunking. Fully tested public releases will continue to be released, approximately every 6 months. Whereas my existing work from 2011 worked on a motorola smartnet system with regular analog fm audio channels, this new system would be p25 with tdma. P25 trunked tracking and decoding with rtlsdr, unitrunker. Sdrtrunk multichannel audio and control data decoder for usb software defined radio dongles and scanner audio output with decoder support for p25 phase 1 c4fmlsm. Contribute to spytor decode development by creating an account on github.
The most common digital speech codec is apco p25, which dsd is able to decode. We previously posted about the dsd digital decoding software and its usefulness with the rtlsdr dongle. P25 phase 1 audio using an rtl sdr and sdrsharp with dsd. Sdrplay software defined radio receiver 12,454 views. Currently all the major contributors are ham operators. All about software defined radio sdr dsdplus is a win32 application capable of reliably decoding multiple types of digital audio formats commonly found on vhf, uhf and 800 mhz, including but not necessarily limited to. Decoding p25 phase 1 with rtl sdr and sdrsharp full walk. Digital speech decoder software package the radioreference. One contributor is also working on adding transmit code with the intention of giving a software based p25 repeater that can be run off conventional pc hardware. It isnt the greatest, but i guess its a work in progress. Super cheap software defined radios such as the rtlsdr can be used to decode these digital voice communication signals instead of expensive radio scanners. What is the best working sdr software for apco p25 reception.
Decoding p25 phase 1 with rtl sdr and sdrsharp full walk through duration. Digital speech decoder and xmbe codec library to decode various xmbe based, qpsk, c4fm modes such as p25 phase 2 tdma, mototrbo, provoice, nexedge and others. Hey all, ive been playing around with the ham it up and a long wire antenna in my dorm room. The frequencies can easily be received with an rtlsdr, but a decoder is required to be able to actually listen to the voice. How to decode p25 using one rtlsdr dongle with dsd plus and unitrunker.
This seems to be working as it should as far as i can tell. It does not allow decoding of encrypted communications. Uk radio scanning forum view topic dsd for windows. Dsd for windows basic setup instructions digital speech decoder version 1 january 16, 2012 by scott halligan, scan new england webmaster download dsd here see dsd in action here overview this tutorial will hopefully provide a clear and basic path to the setup and operation of the dsd for windows software. There are several methods to synchronise hdsdr with other programs depending on the digimode program and the receivers setup. Quick tip on decoding dmrp25nxdn on rtl sdr youtube. It uses the mbelib library a separate open source package to synthesize the decoded digital speech. This is the same as digital recorders except for analog voice channels.