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The resource details the construction of a homebrew 50-watt FET amplifier, based on Don W6JL's _QST Homebrew contest_-winning design from 2009. It functions as an afterburner for QRP transceivers, providing a **12dB** power lift. The amplifier utilizes IRFZ24N FETs and covers the 80, 40, 30, and 20-meter bands, with the 20m LPF extending to 17m. Key technical aspects include an FT37-43 transformer for the input network, a relay-switched 3dB pad for lower bands controlled by an _Arduino Nano_, and an RF-actuated T/R switch. The LPF board integrates four relay-switched filters rated for 50 watts, using capacitors with a minimum 250VDC rating. Performance measurements indicate a power gain ranging from **4.4dB** on 20m to 8.1dB on 80m, with a required drive power of approximately 5 watts. The article also discusses thermal management, current limiting considerations, and component sourcing.

A morse keyer with arduino, project by Ernst PA3HCM

An Arduino based CW contest keyer addon, ideated and designed for the use in conbination with the K3NG Arduino keyer open-source firmware.

A system designed to automatically tune small transmitting magnetic loop antennas, particularly beneficial for **contest operations** where rapid frequency changes are common. The core of the system involves a PC-based control application, AutoCap, written in C#, which monitors antenna SWR via an external meter and commands a motor interface to adjust the loop's variable capacitor. The software is compatible with Windows and Linux via the Mono framework, offering a graphical user interface for monitoring system status, SWR, power, and motor commands. Key components include one or more magnetic loop antennas equipped with DC or stepper motors for capacitor adjustment, an SWR meter with data output (such as the Telepost LP-100A or a homebrew serial/USB SWR meter), the AutoCap PC software, and a motor interface. The most effective motor interface utilizes an **Arduino-based controller** with custom firmware, providing precise control over both simple DC motors and stepper motors, and supporting features like motor braking for finer adjustments. The system allows for configurable SWR thresholds, pulse widths, and motor effort settings to optimize tuning speed and resolution. Optional radio integration provides frequency hints, enabling the algorithm to learn the relationship between motor actions and resonant frequency, thereby speeding up initial tuning responses. The software also supports antenna profiles, allowing operators to save and recall specific configurations for different loops, including accumulated frequency hint data.

A four part article anout a digital rotator controller made with Arduino

Aduino-based Amateur Radio Antenna Rotator Controller that can emulate the Yaesu GS-232A or GS-232B interface by K3NG

A morse keyer project made on Arduino, inlcudes the main program script by m0xpd

If you want to build a cw decoder without using other active components than an atmel 328 - Arduino UNO , then this is sure something for you.

Notes about generating RF sweep signals on the Arduino for filter testing, a digital version of the old Wobbulator concept

An Arduino uno based project to control an MFJ 998 antenna tuner via Icom CI-V interface by VE1ZAC

A portable USB SO2R box made with Arduino

The project is an AVR ATMega328P based AX-25 1200 AFSK Digital Repeater, suitable for APRS digipeating

Easy to build CW decoder based on DSP Goertzel code. If you want to build a cw decoder without using other active components than an atmel 328, Arduino UNO, then this is sure something for you.

A low-cost SWR meter project based on Arduino that works with AutoCap automatic antenna tuner for magnetic loop antennas

Hone your Morse code skills with this entry-level project. Article includes the full schematic of the CW Trainer, describes the sketch and how to operate the morse code trainer.

A new multi-mode QRP radio beacon built around the Arduino. The beacon started with the usual lash-up on the bench, hooking the previously reported Wotduino and DDS Shield up to a driver and a transmitter module, as previously used for the Raspberry Pi beacon

This article describes firmware and minimal hardware for encoding and decoding of on-air CW using an terminal/modem based on these controller boards.

Make and automatic antenna tuner based on Arduino and using economic card. This ATU Project can be installed outdoors and controlled remotely by an rs485 link

AX.25 Packet Modem homebrew project on Arduino

This project involves the construction of a 5 Watt Morse code beacon transmitter that operates in the 28.200 to 28.300 section of the 10 Meter Amateur Radio band. The beacon controller uses an Arduino Uno microprocessor board to produce the three signals that control the transmitter.

qrpTracker is a satellite tracking program that works on the popular and easy-to-program Arduino platform qrpTracker is meant for amateur satellite enthusiasts and computing hobbyists

A project to implement a simple and efficient CW Keyer and a side tone generator with Arduino

This is an Arduino-based rotator interface that interfaces a computer to a rotator or rotator controller, emulating the Yaesu GS-232A/B and Easycom protocols which are supported by a myriad of logging, contest, and control programs.

A Programming-Free Automatic Arduino Antenna Switch project published on NCJ

A kit Digital VFO with pre-soldered surface mount parts and burned-in firmware, a scratch build with Arduino Nano, C code with modifications, and a Silicon Labs si5351 PLL clock generator on a breakout board.

A stepper switch controller made with arduino by N3OX

Arduino code for buidling Yaesu VX8r Handheld Transmitter-compatible GPS. A compatbile GPS unit, made with open-source and generally available components, that can be used to proivde the position and velocity information for the Yaesu HT

An Arduino based remote monitoring system. The Remotino is a remote monitoring system based upon two Arduino Nano units RemotinoSampler and RemotinoViewer that are connected

The RFzero is a multi function signal platform developed for radio amateurs who wants to extend the Arduino skills in combination with RF. The RFzero board is largely compatible with the Arduino Zero and Arduino M0 boards, however, it has been carefully designed for flexible use in RF applications and with attention to the frequency spectrum and stability performance.

A simple DIY project to have a remote cw key connected to your Rig. On the remote side it uses and Arduino Uno board and a cheap HanRun Enc28J60 ethernet shield. On the local side it uses a Morse Key connected to a serial port.

Sketch for an Arduino and si5351 to implement a VFO, BFO, CW, keyer, and control

This circuit stores a morse code message as bits in an EPROM chip, the message controls a relay that keys a CW morse code transmitter. An Arduino processor can also be used in place of this circuit, that eliminates the need to build the circuit and program an EPROM.

Designs for QRSS TX and other Arduino based systems

Software running on the Raspberry PI, Control up to 8 arduino rotators modules, Azimuth maps, Cluster support, Band decoder, contest Web Log, Webcam with RaspiCam support

Arduino-based Automatic Amateur Radio Antenna Tuner

Available worldwide can be used as Arduino Shield or plug it in to you PC , or with a bluetooth adapter connect to Android. With a highly optimized software, KAI200 brings you: a. Antenna analyzer form 1 up to 200 Mhz; b. WSPR transmiter (set up by serial terminal); c. Square Wave Signal generator KAI200 is all you need for your radio whatever it is Yaesu, Icom, Kenwood or Drake and DIY projects.

Amateur radio accessories, like the CT-17B ICOM CI-V hubs, IABs ICOM ACC1 Breakout boxes, GS232Dunio GS232A/B arduino based rotor controler, IMK memory keypad for ICOM Radios

Remote Ham Radio via WebRTC Audio Raspberry Pi 3. Stream Transceiver Audio to and from the remote station though a Browser using WebRTC.

Le radio club de la Cote Basque, amateur radio pages about HF / VHF / UHF / digital modes, Projets with arduino and raspberry , training classes.

Sending and receiving text with Morse code light pulses across the room is a fun and cheap project you can do on a Raspberry Pi or Arduino or any other microcontroller. This post explains how I did it, and how you can do it too.

his controller uses the Yaesu GS-232 command set to control a Yaesu G-5500 Az-El rotor. The controller was designed to be compatible with the SatPC32 tracking program and should work with any tracking program that supports the Yaesu GS-232 format. This controller has been tested with the Arduino UNO and the Arduino Mega2560.

Network Analyzer on an Arduino Shield which covers from 0-72MHz using an Analog Devices AD9851 DDS chip

A WSPR beacon project based on Arduino nano (atmega328P) based microcontroller

While there are quite a few standalone Morse Code or CW decoders out there, I wanted to tackle the problem myself and end up with both a great Arduino learning project and a decent portable decoder for when I'm out in the field operating QRP

Multi-sensor real-time temperature monitoring and logging system using Arduino

A CW Contest Simulator, a simulator for the weekly CWT contests sponsored by CWops, based on Arduino Nano

The K3NG Keyer is an open source Arduino based CW (Morse Code) keyer with a lot of features and flexibility, rivaling commercial keyers which often cost significantly more.

How to build a Simplified Arduino CW Trainer, this is a version that does not need a keyboard.

Learn how to build a QRP digital transceiver with Arduino, based on a project by Burkhard Kainka. This article covers the development process, including the source code, modifications made, and the addition of an OLED display for a more professional look. Discover the inner workings of the transceiver, from the receiver to the oscillator, and how components like the CD2003 are utilized. Explore the schematic design, the use of a PLL module Si5351A controlled by Arduino nano, and more. Ideal for hams looking to create their own digital transceiver for amateur radio operations.

Tysonpower details a DIY AZ/EL antenna rotator project designed for under €150, inspired by the Satnogs Tracker. Constructed with 2020 aluminum extrusion and NEMA23 stepper motors, the rotator is controlled via an Arduino Nano. It effectively tracks smaller antennas like Yagi, though struggles with heavier dishes. STL files are available on Thingiverse.