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Details on projects by WA3TFS published in QST magazine over the past few years. Includes an online shop with several ham radio kits, circuit boards, simple SDR transceivers

Instruction on setting up an RTLSDR dongle under Linux Windows and MacOSx

Adding a Software Defined Radio to an SO2R station

An SDR classification model edited ty Christophe F4DAN The model consists in describing a SDR with letters and digits, each one indicating the value of the corresponding key parameter.

Linrad and SDR-IQ Software Defined Receiver on Shortwave

SDR software for SDRPlay RSP1, RSP1A, RSP2, RSP2PRO. SDRuno is an advanced Software Defined Radio Application platform which is optimized for use with SDRplay's range of Radio Spectrum Processors

Smart antennas or the adaptive antenna array and smart antenna technology used with SDR, cognitive radio, MIMO, and other new technologies.

Ham Cockpit is a program of a new type. All of its functions are implemented in the plugins, the main program simply loads the plugins and helps them work together. Ham Cockpit is an integrated environment for a Radio Amateur that every user can build according to his needs. It can work as SDR client, a logger, a cluster monitor, a propagation prediction tool, or have any combination of these working together.

The ICOM IC-7610 SDR HF/50MHz Transceiver Basic Manual in English PDF File 13 MB

This article will explain a few of the ways author use an external SDR and Linrad to enhance his K3 experience. Linrad is one of many available SDR receiver programs. The same could be done with any radio that lets you access its IF frequency output. Article from NCJ Nov Dec 2019

Software Defined Radio (SDR) for analog and digital modulation modes, can demodulate AM envelope, AM synchronous, AM stereo, LSB, USB, FM, FM Broadcast, DRM30, DRM+

Demonstrates the community-driven mission of the McKinney Amateur Radio Club (MARC), a North Texas organization dedicated to advancing amateur radio. The club actively promotes continuous learning, encouraging technical innovation among its members, and provides avenues for public service engagement, skill enhancement, and global connectivity with fellow operators. MARC hosts weekly breakfast discussions every Saturday at 7:30 AM at IHOP in McKinney, Texas, covering diverse topics and offering a Q&A forum. The club emphasizes emergency communication preparedness, antenna design and tuning, and the science of global radio wave propagation, crucial for clear amateur radio contacts. Furthermore, MARC explores modern radio technologies, including digital modes and _Software-Defined Radio_ (SDR), blending traditional amateur radio with cutting-edge advancements. The club also facilitates license testing sessions, hands-on training, and participates in events like _Field Day_ to hone emergency communication skills.

HF converter for SDR radios

The Union Métropolitaine des Sans-filistes de Montréal (UMS) operates daily nets on **VE2REM** 147.015+ T103.5, **VE2RYV** 146.655- T141.3, and **VE2RVK** 145.430- T141.3, alongside Echolink VE2UMS-L and DMR TG302273. This Montreal-based club, representing hundreds of radio amateurs, provides information for those interested in amateur radio and serves as a communication hub for its members, including a regularly visited ham radio flea market section. The site also highlights significant club initiatives like the AREDN Mesh Network modernization project and an innovative after-school program. The UMS website details upcoming events such as the 2026 sugar shack invitation, Field Day 2025, and monthly meetings scheduled for September 18, 2024. It also features a live log sheet section and a WEB SDR, offering practical tools for members and visitors. The club's president, Bruno VE2VK, extends a welcome, emphasizing the UMS's role in fostering amateur radio in the greater Montreal region, with contact information provided for inquiries.

Discussion group about RTLSDR Dongles, software support and hardware mods for these Software Defined Radio systems based on RTL2832U

This resource is an online tutorial focused on setting up the Raspberry Pi for amateur radio applications. It covers the installation and configuration of various software packages tailored for digital communications and protocols, including _Packet Radio_ with Hamlib and Direwolf, as well as data modes like FLDigi and WSJT-X. The guide also details the integration of hardware components such as GPS clocks for time synchronization and real-time clocks for enhanced functionality. Users will find instructions for installing software like GPredict for satellite tracking and GQRX for software-defined radio (SDR) applications. The tutorial emphasizes practical steps, including the use of command-line inputs in the Raspberry Pi OS terminal, and provides troubleshooting tips for common issues such as faulty SD cards or insufficient power supplies. Operators are encouraged to explore various applications, including APRS iGates and WSPR beacons, to enhance their ham radio experience. The material is designed for licensed amateur radio operators with basic knowledge of electronics and computing.

KiwiSDR Software-defined receiver at Bjargtangar Iceland covering HF Bands

Maker of bladeRF usb superspeed SDR Software Defined Radio

A tutorial on how to setup a receiver capable to decode SSTV signals with a small RaspberryPi version 2 and a RTL-SDR dongle. The author explains how to install the needed software to interface the RTL-SDR and a step by step guide to install the QSSTV software used to decode the signals.

Makers of SkyPiRx and SkyPi-40 anateur radio kits and SDR for Raspberry Pi

SDR++ is a cross-platform, open-source SDR software designed for minimal bloat and ease of use, supporting Windows, Linux, macOS, and BSD operating systems. It incorporates multi-VFO capabilities and offers extensive hardware compatibility through both _SoapySDR_ and dedicated modules. The software features SIMD accelerated DSP for efficient signal processing and provides full waterfall updates when possible, which enhances signal browsing. Its modular design facilitates the development of custom plugins, allowing users to extend its functionality. The application's focus on a bloat-free architecture and user-friendly interface aims to simplify the experience of working with Software Defined Radios. The full waterfall update mechanism is particularly beneficial for visualizing and identifying signals across a wide frequency spectrum, improving operational efficiency for radio amateurs. The modular plugin system enables community contributions and specialized enhancements, making _SDR++_ adaptable for various amateur radio applications, from general listening to specific digital mode decoding.

How-to decode and Display APRS Packets from WebSDR Audio using linux computer

The _Icom IC-7300_ transceiver, a popular SDR rig, can be readily configured for digital modes like FT8 using _WSJT-X_ software. This guide details the necessary steps, from downloading the correct version of WSJT-X to configuring the radio's USB audio and CAT control settings. It emphasizes a straightforward approach, aiming to simplify the often complex initial setup for new digital mode operators. K0PIR shares his practical experience, outlining the specific menu settings on the IC-7300, such as USB SEND/DPT and USB MOD LEVEL, which are crucial for proper signal modulation and transmission. The resource also covers the integration of WSJT-X's built-in logging capabilities, streamlining the process of recording digital contacts without needing external logging software immediately. This setup allows for efficient operation on various HF bands. Two embedded videos further illustrate the configuration process, providing visual aids for each step, from initial software installation to making the first FT8 contact. The author's method focuses on minimizing common setup hurdles.

The SDRcom platform provides a unique browser-native Software Defined Radio experience, emulating a traditional radio with a physical VFO dial, switches, and an analog meter. It integrates a high-resolution 64k FFT waterfall display, supporting essential modes like AM, FM, SSB, and CW. The **SDRcom Blue** version interfaces with SDRplay® receivers via a local WebSocket, while the free **Red Lite** version supports RTL-SDR V3/V4 dongles through WebUSB, including basic audio EQ and 100 memory slots, along with FT8 decoding. For advanced operators, the Red Pro version expands capabilities with 1000 memory slots, upgraded high-resolution waterfalls, and enhanced W4PAH FT8, FT4, and WSPR decoder engines. It also incorporates 4-band DSP noise reduction and an intelligent band scanner, proving beneficial for weak-signal work. The Network edition extends functionality to access hundreds of global remote SDRs, and an ADS-B aircraft decoding feature with 3D positioning and mapping is also available. All SDRcom applications are designed to run directly in a web browser, eliminating the need for any software installation. This approach simplifies access and setup for radio enthusiasts, from casual SWLs to dedicated digital mode operators, allowing immediate engagement with the airwaves.

Review of the Xiegu G90 20W HF portable transceiver capable to run CW SSB AMD modes, based on an Software Defined Radio

Monitoring extremely weak signals in the QRSS (Very Slow Morse) mode requires specialized receiving and processing capabilities to extract information below the typical noise floor. This project provides a software solution, _QrssPiG_, designed to run on a Raspberry Pi, enabling it to function as a dedicated QRSS grabber. It interfaces with various Software Defined Radio (SDR) devices, including the popular _rtl-sdr_ dongles and _HackRF_ units, to acquire raw I/Q data streams. The software then performs the necessary signal processing to visualize and decode these faint, long-duration CW transmissions, often operating with milliwatts of power. The system leverages the computational power of the Raspberry Pi for real-time signal analysis, allowing hams to participate in QRSS experiments and monitor distant beacons. It supports different SDR hardware, offering flexibility in setup and deployment for home stations or remote monitoring sites. The project includes detailed instructions for installation and configuration, making it accessible for those familiar with Linux environments. This grabber is particularly useful for tracking propagation on the LF and HF bands where QRSS activity is common, providing a visual representation of signal presence over extended periods.

An SDR project, MDSR modulator-demodulator software radio, made using an inexpensive converter and a pc. MDSR has a transceiver and a receiver converters.

This project describes a DIY all band HF SDR transceiver. Built around a Softrock 6.3 kit, it boasts a 20W homebrew amplifier and ATmega168 microcontroller for USB control. An LCD displays frequency, power, and SWR. Automatic LPF selection and SWR protection enhance functionality. Compatible with Rocky and PowerSDR software, this project provides a cost-effective and powerful HF SDR transceiver for hobbyists.

Software Defined Radio, QIRX is 64-Bit software, based on TCP/IP raw data, running with any RTL-SDR dongle being driven by rtl-tcp.exe.

Operates as a universal client for Software Defined Radios, SDRoxide provides a robust platform for amateur radio operators to engage in diverse modes and activities. It integrates a **GPU panadapter** for real-time spectrum visualization, dual VFOs for flexible tuning, and advanced neural noise reduction to enhance weak-signal reception. The software supports a comprehensive suite of digital modes, including FT8, JS8, RTTY, and PSK, alongside built-in skimmers for automated signal detection. Its capabilities extend to Winlink radio email, 868 MHz ISM sensor decoding, and hands-free satellite operation with continuous Doppler correction and Hamlib rotator tracking. The client offers native drivers for popular SDR hardware like RTL-SDR, RX-888, and HackRF One, covering a wide frequency range from 1 MHz to 6 GHz. It also interfaces with CAT-controlled transceivers via Hamlib and Flrig, allowing a second SDR to function as a panadapter. Network dongles, SpyServer, KiwiSDR, and OpenHPSDR Ethernet SDRs are also supported, providing flexibility for remote and local operations. Beyond core radio functions, SDRoxide incorporates a live 3D space-weather globe with aurora and lightning displays, real-time satellite tracking with TLE updates, and a measured propagation heat map. It includes a full-featured logbook with DX cluster spots, award tracking for **DXCC** and WAS, and direct QSL upload integration with services like eQSL and Club Log, streamlining post-QSO management.

N-channel scalable coherent receiver that employs the RTL-SDR technology in order to create inexpensive multi-channel receiving systems.

Setting Up the SDR-1000 for WSJT using VAC 4.03

How to setup a band-tracking panoramic signal display to work along to your transceiver.

Tune into this SDR receiver located near Krizevci, Croatia with 0-2 MHz, 60-80 meters band and 40-49 meters band

DigiSkimmer is a GIT project that permits FT8/FT4/WSPR skimmer base on kiwirecorder/KiwiSDR.

Laboratory 599 makers of the DISCOVERY HF/50 MHz SDR Ultra-compact Trasceiver.

A tutorial on setting up a Low Cost QRP (FT8, JT9, WSPR etc) Monitoring Station with an RTL-SDR V3 and Raspberry Pi 3

WebSDR Pardinho SP Brazil providing access to HF bands 160 80 40 20 15 11 meters bands.

A review of the Chinese version of uSDX USDR HF QRP Transceiver. Author made an extensive review of receiver and transmitter features.

This is a WebSDR receiver, located in Friedrichshafen, Germany (at Lake Constance) using a multiband dipol and a FUNCube Dongle Pro+.

This PDF document outlines the process for establishing an **OpenWebRX+** station utilizing Software Defined Radio (SDR) devices on a Linux platform, specifically Debian Bookworm. It details the capabilities of such a setup, including reception across various frequency bands supported by the SDR hardware and the decoding of multiple modes like FM, WideFM, SSB, AM, ADSB, FT8, and CW, with examples provided for FT8 reception and mapping, sensor data, and ADSB. The guide recommends specific hardware configurations, suggesting older x86-64 laptops with 4GB RAM or Raspberry Pi 4 models for the host system. For SDR devices, it endorses **RTL-SDRv3/v4** or HackRF, noting the necessary driver installations for RTL-SDR. The software installation sequence is meticulously laid out, from installing Debian Bookworm to adding OpenWebRX+ repositories, installing the application, and configuring device-specific drivers. Authored by Christian Horn (JL1AYH), the resource also includes a brief personal background of the author. It concludes with instructions for accessing the OpenWebRX+ interface via a web browser, either locally or remotely over a network, and provides contact information for further inquiries.

Analyzing 433 MHz radio signals from common wireless devices, such as temperature sensors and remote controls, involves understanding **On-Off Keying (OOK)** modulation. This resource details the process of capturing these signals using a Software Defined Radio (SDR) like Gqrx and then visually inspecting the captured audio data in a sound editor such as Audacity. It differentiates between **Pulse Width Modulation (PWM)** and Pulse Position Modulation (PPM) encoding schemes, illustrating how to identify and decode binary data by eye based on pulse and gap durations. The article provides a step-by-step walkthrough for decoding a wireless thermometer's data, correlating bit patterns with known temperature, humidity, and channel values. It also demonstrates decoding an RF remote control's button presses, highlighting the constant and varying parts of the transmitted packets. The content further introduces automated decoding using tools like RTL_433, explaining its capabilities in parsing various device protocols and showing how to interpret its output, including modulation type and decoded data. Specific examples include analyzing Prologue sensor protocol specifications from RTL_433's source code and noting common operating frequencies like 433.92 MHz in Europe and 915 MHz in the US.

Remote SDR is a web application allowing to remotely control an amateur radio transceiver between 1 MHz and 6 GHZ. It allows processing of Adalm-Pluto SDR in addition to HackRF or RTL-SD Reception in NBFM, WBFM, AM in addition to SSB Transmission in NBFM or SSB and more

A software defined receiver located in Tuscany Italy with a Windom antenna convering HF bands

The _RTL-SDR V4_ dongle offers a tuning range from approximately 500 kHz to 1.7 GHz, encompassing HF, VHF, UHF, and microwave amateur allocations, with direct sampling improvements for HF reception. This guide outlines two primary installation methods for _OpenWebRX_ on a Raspberry Pi: utilizing an official Raspberry Pi image or employing a Docker installation. It also provides specific recommendations for Raspberry Pi models such as the 3/3B+, 4, and Zero 2 W, alongside practical advice for antenna selection and placement to optimize reception. _OpenWebRX_ is an open-source, browser-based SDR software package that facilitates web-accessible radio reception. The setup results in a receiver featuring a live waterfall display and demodulation capabilities for AM, FM, SSB, and CW modes. This configuration can be deployed for public access or restricted to a private network, depending on the operator's preference. Further sections address common troubleshooting scenarios and offer tips for mitigating noise, ensuring a stable and effective SDR listening station. The _RTL-SDR V4_ also integrates improved front-end filtering and a software-switchable bias tee, enhancing its utility for various amateur radio applications.

MARCA, Inc. operates approximately 24 repeaters across Arizona mountaintops and Phoenix-area rooftops, supporting modes like D-STAR and Fusion. The club, holding the **W7MOT** callsign, engages in diverse activities including ARRL Field Day events near Forest Lakes, AZ, ARRL FMT contests, and antenna experimentation. Members actively participate in HF operations such as voice, digital, CW, DXing, and various digital HF modes, alongside MESH and EOC operations within the valley. The club's interests span a broad technical spectrum, from SDR radio building to antique radio restoration, and include modern digital modes like WSPR, WSJT, FT8, and FT4. They also explore computer-based operations such as Echolink, fostering a dedicated Single Board Computer (SBC) and Raspberry Pi group. Monthly VE testing sessions for Technician, General, and Extra Class licenses are conducted by Ray Vasquez, K4RMV. Meetings are held on the third Tuesday of each month, typically lasting two hours, with a business segment followed by a technical presentation. These gatherings occur in-person at IHop in Mesa, AZ, and concurrently via Zoom, accommodating both local members and winter visitors. Informal chat groups often form post-meeting to discuss specialized topics like D-STAR, SDR, APRS, MESH, and Fusion.

This project enhances Arjan te Marvelde's uSDR-pico by integrating a waterfall display feature. By adding an ILI9341 240x320 2.4" TFT display and modifying the software, the goal is to provide a panadapter to the existing transceiver. Initially developed with Visual Studio, the code was later migrated to Arduino IDE for Raspberry Pi Pico compatibility. The focus remains on preserving the original software, primarily enhancing the dsp.c file for waterfall implementation.

Stand Alone Software Defined Radio, direct sampling receiver from 30 kHz to 1700.00MHz continuous frequency range, LAN interface for remote access

Listen to HF communications via the KiwiSDR online receiver located in Badgad IRAQ locator LM23fh. This web receiver is running a MLA 30+ antenna and can be tuned easily on all HF bands from 10 to 80 meters.

SDR as an RFI site survey tool. This article will show how a site survey tool was built to use in RFI mitigation.