Ian Wraith designed and built a low cost 2-4 GHz downconverter for an SDR, that is available on Github: I recently became interested in exploring some of the signals found in the 2.4 GHz ISM band. The problem is that my favourite SDR (Software Defined Radio) an Airspy R2 only covers up to 1.7 GHz. Initially […]
Simonhk (G0FCU) wrote a series of posts on building homebrew SDR HF transceiver: However, what you might notice is the presence of image products in the waterfall. The processing of the signal suppresses all but the very strongest of these so they don’t appear as audio but it is mighty confusing when they are on the […]
A simple VOR receiver for Airspy and RTL-SDR called Vortrack by Thierry Leconte, that is available on GitHub: In the past we’ve seen several other posts about RTL-SDRs being used to decode VOR signals, but Thierry’s implementation appears to be the easiest way to get a bearing straight away. You’ll get the most use out of […]
Here’s a demonstration of the MFJ-1708SDR transmit/receive automatic relay switch from YouTube channel HamRadioConcepts . Here is an interesting device, for use with your SDRplay or other SDR dongle for receive. You can share your current antenna with your 100 watt HF rig and an SDR for receive.
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 second with zero errors, resulting […]
Jon Hudson over at DesignSpark writes: This is a belated post of a fun project we did for RS Components. With the upcoming 80th anniversary of the founding of ‘RadioSpares’ – the original name for UK-based RS-Components, and the creation of an “Engineers’ Playground” as a feature of the 2016 Electronica event in Munich, […]
David has written an article on measuring SDR noise figure: One number I wanted to know was the Noise Figure (NF) of the SDR. Mark has a bunch of SDRs so we got on a roll and checked out the NF on all of them. Now there are a lot of people playing with SDRs, but […]
Our friends at RTL-SDR.com 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 data such as books, news, […]
Nikos has developed an Android app which works with the RTL-SDR dongle to demodulate the ADSB signal from aircraft and overlays the position of the aircraft on a high resolution offline map. So the user can use the App without Internet connectivity, on board an aircraft in real time! Nikos’ “Track your flight Europe” app […]
Sixuniform has released YOUSDR v0.1 Alpha, an RTL-SDR webinterface for Raspian / Raspberry Pi. This is a web-wrapper for the rtl-sdr softwares. Currently it commands rtl_fm, rtl_tcp and dump1090. The software can be downloaded from its GitHub. The instructions on the GitHub page show how to set it up on a Raspberry Pi running Raspbian, […]
The Myriad crew has announced the new Stream board released through the MyriadRF initiative for doing SDR with the LMS6002D/LMS7002M from Lime Microsystems. It’s a fully Open Source board with Kicad design files and a fully Open Source OpenRISC SoC for the FPGA: We are thrilled to announce that the STREAM board is the latest project […]
Tomasz Watorowski has published a new build, a NE612 RTL SDR Upconverter: This is a simple yet completely functional upconverter for the popular SDR donlge. The construction was build around cheap and easily obtainable mixer IC marked as NE 612, manufactured by Phillips Semi. Despite its limitations, it performs outstandingly well, at least when price-to-quality factor […]
rheslip has been working on a software defined radio using the Arduino compatible Teensy 3.1 and audio shield from PJRC. Source code is available on Github. Project info at Open Emitter blog.
According to AMSAT-UK, “a new paper has been released by Dr David Morgan 2W0CXV on using the RTL2841 DVB TV Dongle as a SDR processor with SpectrumLab. The paper ‘Techniques for using the RTL Dongle for Detecting Meteors’ covers the setting up and use of the dongle to receive meteor pings from the Graves Radar […]
Here’s an informative two-part series of posts over at FunOverIP detailing how to reverse engineer a Verisure wireless alarm. Part 1 details the beginning steps such as finding the modules radio frequency and modulation type, analyzing the chipset datasheet and using GNU Radio.
Here’s a different and unconventional way to view a VHS tape (as if VHS tapes aren’t considered unusual enough today). DogsRNiceMineCraft posted this video on YouTube showing video received using an RTL-SDR dongle. I got a VCR today and wanted to see if I could receive the signal from the RF out using TV sharp. […]
AMBE is a voice compression algorithm employed in vocoder chips used by DVSI Inc., and is commonly used in Icom’s D-Star, Yaesu’s Fusion, APCO-25, DMR, Opensky and other digital formats on the amateur, commercial and public safety frequencies. In this talk from last September’s TAPR/DCC conference in Austin, TX, Bruce Perens K6BP presented his views […]
During the TAPR/ARRL Digital Communications Conference in Austin last September, Stephen Hicks N5AC gave this presentation on interfacing with FlexRadio using their open API. Part II of this presentation was given by Graham Haddock KE9H, and discussed the FlexRadio wavefrom API. It is available from HamRadioNow. FlexRadio produces a series of high-end SDR’s, with the […]