Archive for the ‘digital radio data’ Category

A digital communication project using OFDM and 32-QAM

Thursday, October 19th, 2017

Tahmid blogged about a digital communication project using OFDM and 32-QAM as their ECE4670 final project: This builds on a previous lab, where orthogonal frequency division multiplexing (OFDM) is used with on/off keying to send data over the channel. This scheme achieved a data rate of about 14,000 bits per...

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Posted in digital radio data, SDR | 1 Comment »

RX/TX sequencer

Wednesday, May 17th, 2017

Lukas Fässler has designed and built an RX/TX sequencer based on a PIC16F18325,  that is available on github: Much like the beacon keyer presented here earlier, this RX/TX sequencer is a simple but useful little device. Its typical use is in ham radio applications when a separate power amplifier (PA) and/or a...

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Posted in digital radio data, PIC | No Comments »

Forty-9er Shield

Friday, December 23rd, 2016

m0xpd writes: I've been tinkering with a quick lash-up of Wayne Burdick, n6kr's famous 'Forty-9er' receiver, implemented on an Arduino shield and tuned by one of my DDS systems. Regular readers will remember how I tried running my Kanga / m0xpd Sudden-inspired receiver shield under the control of the new...

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Posted in digital radio data, RF | No Comments »

Lantern: A New 925 MHz to 2175 MHz RTL2832U Based SDR for Satellite Reception

Friday, June 12th, 2015

Our friends at are reporting on a new SDR based on the RTL2832u. "It is called the “Lantern” and is being developed for the Outernet project. The Outernet project aims to be a “library in the sky” satellite based service that will provide free access to daily downloads of...

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Posted in digital radio data, News, SDR | 3 Comments »

Project: extracting and geographically plotting DTRS site information

Sunday, September 28th, 2014

Lui Gough has been researching the Australian railroad system's new digital radio system and has posted detailed observations: As a radio enthusiast, and highly observant public transport user, I’ve made many notes about the deployment of the new Digital Train Radio System (DTRS) sites. This new system is based upon...

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Posted in digital radio data, RF | No Comments »

Analysing 433 Mhz transmitters with RTL-SDR

Wednesday, June 25th, 2014

Yashin has posted this tutorial at ArcanumX demonstrating how to read and decode 433 MHz digital data transmissions. "I intend to demonstrate how the RTL-SDR can be used to sniff 433 Mhz transmitters. These are pretty cheap and can be found in a lot of appliances including alarm sensors. This...

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Posted in code, digital radio data, Linux, open source, SDR | No Comments »

Digital audio amplifier with PLL synthesized FM radio

Wednesday, June 11th, 2014

Another open source hardware project by Dilshan Jayakody the digital audio amplifier with PLL synthesized FM radio: This is high quality stereo digital audio amplifier with PLL synthesized FM radio receiver. Some of the high level specifications of this receiver are listed in below: Audio output power: 4W + 4W (with 8ohm speakers)...

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Posted in AVR, digital radio data, open source | 2 Comments »

Video: using NRF24L01+ wireless module with Arduino

Thursday, April 10th, 2014

The NRF24L01+ is a popular wireless communications module from Nordic that interfaces well with MCU applications. In this detailed video tutorial, Kevin Darrah outlines how to use it with the Arduino. Source code is available from Kevin Darrah's website.

Posted in digital radio data, tutorials, Videos, wireless | 2 Comments »

RTLAMR: an RTL-SDR receiver for 900 MHz smart meters

Saturday, February 15th, 2014

It never ceases to amaze how many projects are developed making use of the RTL-SDR dongle. Bemasher has developed a software tool which interprets the signals in the 900 MHz ISM band sent from smart electric meters which are growing in popularity among utility companies. This project is a proof...

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Posted in digital radio data, hacks, SDR, wireless | 1 Comment »

Digital Speech Decoder 1.7.0-dev adds D-Star support

Wednesday, January 8th, 2014

DSD is a popular software tool for decoding various unencrypted digital radio protocols about which we've previously posted. We noticed that there is now a release of DSD which purports to be capable of decoding the amateur radio digital protocol known as D-Star. This is in addition to P25, X2-TDMA,...

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Posted in code, digital radio data, open source, RF | No Comments »

Improved digital voice P25 decoding with DSDPlus

Saturday, December 28th, 2013

We previously posted about the DSD digital decoding software and it's usefulness with the RTL-SDR dongle and other signal sources. Now there's a newly released version known as DSDPlus which promises to deliver improved decoding and clearer audio of unencrypted APCO Project 25 (P25) radio signals. This program is designed...

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Posted in digital radio data, SDR | No Comments »

Decoding radio-controlled bus stop displays

Saturday, November 30th, 2013

Oona Räisänen (a/k/a Windytan) is a self-taught signals and electronics hacker from Helsinki, Finland, who is fascinated by mysteries, codes and ciphers, and vintage tech. She's previously written regarding the use of digital transmissions carried on FM broadcast subcarriers as a means of supplying data to digital information signs used...

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Posted in digital radio data, reversed, RF, SDR | No Comments »

Decoding FLEX pagers using RTL-SDR and Linux

Tuesday, November 26th, 2013

Superkuh2 demonstrates how to decode FLEX pager radio traffic. He uses gr-pager and zarya's implementation of it on the Linux platform with the RTL-SDR dongle. This script runs at a 250 KS/s sample rate and decodes one 12.5 KHz channel only. Internally it uses gnuradio's optfir to generate low pass...

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Posted in digital radio data, Linux, RF, SDR | 3 Comments »

EFERGY E2 Classic FSK decoding using RTL-SDR and R-Pi

Saturday, November 16th, 2013

Nathaniel Elijah has posted the a complete working prototype of an EFERGY E2 CLASSIC Transmission decoder using a Raspberry Pi and RTL-SDR USB Dongle. The EFERGY E2 Classic is an electrical usage monitor which displays information received from associated wireless energy sensors. Nathaniel writes, "It is now possible to capture...

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Posted in digital radio data, hacks, R-Pi, reversed, SDR | 2 Comments »

Update: HackRF based SmartNet radio monitor

Sunday, November 10th, 2013

We previously posted about the GNURadio based scanner for SmartNet II digital radio systems. Now Luke Berndt has updated his project info and has posted samples of the decoded system audio online. It has taken a lot of futzing, but I have my HackRF recording the Washington DC's Fire Dept...

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Posted in digital radio data, open source, SDR | No Comments »

Receiving, decoding and decrypting GSM with RTL-SDR

Thursday, October 17th, 2013

Domi007 has been experimenting with using the RTL-SDR dongle to receive and analyze GSM signals for research and academic purposes. He has posted a four parttutorial explaining his use of GNU Radio companion, Wireshark and other open source software to receive and analyze and decode GSM packets. The above link...

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Posted in digital radio data, how-to, open source, SDR | 4 Comments »

Video: Breaking SCADA communications

Saturday, October 12th, 2013

In this presentation from the InfoSec 2013 conference held October 3, 2013 in Louisville, Kentucky, Mehdi Sabraoui discusses the relative insecurity of SCADA network protocols. He covers the Sixnet Tools, taking advantage of a proprietary communication protocol supported by nearly all of Sixnet’s SCADA devices to compromise these devices across...

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Posted in digital radio data, hacks, RF, Videos, wireless | No Comments »

Decoding D-STAR headers with the RTL-SDR

Friday, September 27th, 2013

D-STAR or Digital Smart Technologies for Amateur Radio is a digital voice and data protocol used in amateur radio. Here's a link which shows how the RTL-SDR can decode D-STAR text messages and headers (link is in Italian but Google translate can help, and the pictures show more than enough...

Posted in digital radio data, RF, SDR | 2 Comments »

GNURadio based scanner for SmartNet II digital radio systems

Tuesday, September 24th, 2013

Luke Berndt posted on the HackRF-dev forum: "I built a Scanner app so I could use my HackRF to listen to my local fire department. It should work for any Moto SmartNet trunking systems that uses P25 CAI for the voice channels. It is based off the gr-smartnet code and...

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Posted in code, digital radio data, open source, SDR | No Comments »

DSD block for GNU Radio

Wednesday, August 28th, 2013

Luke Berndt from the HackRF-dev forums has posted his work to make the functionality of DSD available to GNU Radio users in the form of a GRC block. "I have been playing around a bit and found an easy way to receive and playback digital LMR. More and more of...

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Posted in digital radio data, open source, RF, SDR, software | No Comments »

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Recent Comments

  • gant: They still have a couple of the more expensive (but still considerably cheap) 5S-I-S01 in stock...
  • readybrek: Anyone got a any recommendations for a budget-priced hot air station?
  • William: lol I'm happy to waste 3c for each program/debug cycle... but probably not the time spent soldering a new device down to a proto board!...
  • Joe Desbonnet: Ya, I can recommend the low melting point solder. I used brand 'ChipQuik' and it's amazingly easy to use.
  • Jerome: I need a new BusPirate for the Fablab ;) Many thanks!