![]() ![]() If you are trying to track digital voice communications, it can be done with one dongle and this is discussed in the tutorial too. This can also be done with one software radio, and one hardware radio with discriminator tap if one have one of those. One radio will be used for the control channel and unitrunker, and the other will be used for the listening to the voice channel. Essentially, to follow trunked radio conversations you will need two rtl-sdr dongles (or any two software radios), unitrunker and virtual audio cable. More information about unitrunker and the signals it can decode is shown on this RadioReference wiki page.Ī tutorial on how to set up unitrunker with SDRSharp has been posted here. Fortunately there is software called unitrunker which can listen to the control channel, and determine what voice frequencies need to be tuned to. This all means that following a radio conversation with a software defined radio such as the rtl-sdr can be difficult, as the conversation can hop around multiple frequencies. A special control frequency is used to determine which frequency a radio should be tuned to. This allows support of a much larger number of radio users. Trunking radio is a radio system where a finite number of frequency channels are shared between multiple radio users. In addition, while we target the RTL-SDR devices, we will discuss the feasibility of including non-traditional SDR hardware in the array, including non-Realtek tuner cards and inclusion of HackRF devices. The code for running the array will be introduced and released for public consumption. I will explain the mistakes I made in building the array and what I did to attempt toovercome such pitfalls. Also discussed will be using the array versus USRPs and the issue of antennae for all of the devices. The system allows for “strong signal capture” as well as, simply, signal modeling with “strong signal alerting”. The array allows for both RF sampling and power analysis to be split over multiple systems in order to increase capture and spectrum analysis capabilities. This work investigates building and running an RF scanner array for monitoring and spectrum mapping using cheap SDR devices. Software-Defined Radio (SDR) has increased in popularity in recent years due to the decrease in hardware costs and increase in processing power.One example of such a class of devices is the RTL-SDR USB dongles based on the Realtek RTL2832U demodulator. In this era of increasingly being “watched”, we must be prepared to do our own “watching”. The goal is to help the audience understand the what, why, and how of building their own RF monitoring array so that they will be able to do it themselves. This talk will discuss my experience in building a distributed RF scanner array for monitoring and spectrum mapping using such cheap SDR devices. ![]() One example of such a class of devices is the RTL-SDR USB dongles based on the Realtek RTL2832U demodulator. Software-Defined Radio (SDR) has increased in popularity in recent years due to the decrease in hardware costs and increase in processing power. Talk: Monitoring the Spectrum: Building Your Own Distributed RF Scanner ArrayĪndrew Reiter a researcher at Veracode has given a talk at the Chaos Communication Congress about building a distributed RF scanner array using cheap RTL-SDR dongles. ExtIO with Decimation & Tuner Bandwidth Controls.Manual gain controls and decimation driver.Measuring Traffic Volumes with Passive Radar.SignalsEverywhere Direction Finding Tutorial.Measuring Filter Characteristics & VSWR.Performing Replay Attacks with RTL-SDR and RpiTX.QRP (FT8, JT9, WSPR etc) Monitoring Station.Decoding 433 MHz ISM Band Weather Stations.GOES 16/17 and GK-2A Weather Satellite Tutorial. ![]()
0 Comments
Leave a Reply. |