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The project details a DIY SWR/Wattmeter designed around an _Arduino Uno_ shield, providing capabilities to measure RF power from 2 to **200 watts** and Standing Wave Ratio (SWR) for HF amateur radio bands. This construction features a compact design, integrating the measurement circuitry directly onto a custom PCB that interfaces with the Arduino Uno microcontroller. Key components include a directional coupler for sensing forward and reflected power, precision rectifiers, and analog-to-digital conversion for processing RF signals. The Arduino firmware handles calibration, calculations, and displays the results on an integrated LCD, offering real-time feedback on antenna system performance. The design prioritizes simplicity for homebrewers. Performance specifications indicate accurate readings within the **2-200W** power range, suitable for typical QRP to medium-power HF operations. The project provides schematics and a basic overview of the software logic.

Setting up the Arduino DUE to run as an SDR software defined radio

This sketch will read RF power and SWR from any SWR bridge, designed to work on VHF UHF bands

Power and SWR Meter with dual bargraphs and sticky bar, using 2x AD8307

An home made antenna analyzer made with Arduino Nano

An HF QRP CW RTX built around the Arduino open-source electronics prototyping platform

Controlling an antenna tuner with an arduino board. The project includes movies, explanation and the arduino code

Open source Arduino based CW (Morse Code) keyer with a lot of features and flexibility, often rivaling commercial keyers.

Ham Radio applications with the Arduino micro-controller presentation

This project describes an ARDUINO based automatic antenna tuner, for an end-fed half wave (EFHW) antenna, working on 20 & 40 meter bands

Unified Microsystems presents a range of amateur radio products, notably the **XT-4 MK2 CW Memory Keyer**, a battery-powered iambic keyer designed for portable operations like Field Day, POTA, SOTA, and DXpeditions. It features four non-volatile memories, each storing approximately 240 Morse characters, and operates at speeds from 8-45 WPM. The XT-4 MK2 also includes an auto power save function and paddle reverse, making it adaptable for multi-operator setups. Beyond the XT-4 MK2, the site details the **W9XT Contest Card**, a PC plug-in board offering DVK and CW interface capabilities, allowing operators to record and playback CQs and contest exchanges. Other offerings include the BevFlex-4X RX Antenna System, RAS-4 RX Antenna Switch, VK-64 Voice CW Keyer, and various USB interfaces. Additional products cover electronic development, such as the ATS-1 Terminal Shield for Arduino™ and VR-X Power Supply Voltage Regulators, demonstrating a broader scope beyond just operating accessories. The XT-4Beacon MK2 / CW IDer is also highlighted for beacon projects, capable of storing messages up to 5 minutes at 25 WPM.

An cheap homemade azimuth and elevation rotation system using an Arduino/AVR.

Inline RF Power & VSWR Meter. A DIY meter 0 to 30 Watt with Average and Peak. Circuit Description, Arduino Nano software code and part list to DIY your own Digital SWR Meter

An interesting rotator interface that interfaces a pc to a rotor or rotator controller, emulating a Yaesu GS-232A/B and Easycom protocols, made with Arduino

A DDS VFO using the Arduino Uno platform

An open source Automatic Packet Reporting System tracker based on Arduino by Javier Martin

Cheap AFSK TNC, APRS for everyone with arduino, BeRTOS and a STM32F100 chip by OM5AMX

This Arduino project decode ICOM CAT frequency information and switch antennas according to preset values. RX and TX antennas can even be different, a project by ON7EQ

Build your own home made Antenna Analyzer with an arduino micro, or a cheeper one with a pic processor

This is an attempt to build an Antenna rotator controller using Arduino Mega 2560 with a nice user interface showing the actual position of the antenna.

A homemade remote antenna switch made with an Arduino Uno by KK7S

Homemade SWR PWR Meter based on Arduino

An interesting arduino project to work as an antenna tuner

A multi-mode QRP radio beacon built around the Arduino. This radio propagation beacon transmitter project is presented by M0XPD

A sketch to read the input from the microphone and translate the dots and dashes into ASCII characters.

An Arduino project to make it work as a KISS TNC

An interesting project about an Arduino-based frequency counter fot the Kenwood TS-520S

Arduino uno universal VFO/BFO with Si5351 and TFT touch screen for BITX like txcvr

Generic PI4 + CW + Carrier Arduino Beacon Controller with interfacing to Analog Devices AD9833 DDS AD9850 DDS, AD9851 DDS, AD9912 DDS , AD9913 DDS, ADF4350 and ADF4351 synthesizers, ADF5355 synthesizer, ADF5356 synthesizer, Radio modulated by an audio soft-DDS Reverse DDS, RDDS microwave unit, Silicon Labs Si5351A programmable clock generator, Silicon Labs Si570 programmable XO/VCXO, Texas Instruments LMX2541 synthesizer

Hy-gain HAM-IV rotator control with Arduino by OK1BIL

The circuit is based on two AD8307 log amplifiers, which are connected to the forward and reflected ports on a directional coupler

An Arduino APRS project based on the real time OS BeRTOS

A project for a simple RTTY decoder based on Arduino UNO R3. Includes the RTTY modem source code available for download along to schematics pictures and references.

Building an Open Source Arduino APRS Tracker with LCD & GPS ( SVTrackR )

Arduino Band decoder project available in KIT

Antenna Rotor Control Software for Windows and Linux is a companion project to the arduino rotor controller.

Rotator Controller Using Arduino and PstRotator project by G4HSK

A vector graphic antenna analyzer project page by DC2WK demonstrating a project realized by DG7EAO includes, part list, schematics, and videos.

An Arduino TNC modem project based on KI4MCW source code with pictures and schematics

Inspired by Milan OK7GU, the goal is to build an universal antenna controller - for different types of rotor, different motor, encoder

This Arduino library allow you to control various functions of Yaesu FT-857 through the use of CAT functions. This may work even with FT-817 and FT-897.

A Yaesu rotator controller made with an arduino

This project hereby presented is a complete HAM radio simplex 'smart' repeater, built around a Motorola GM-350/950, Arduino NANO board and a WINBOND audio recording integrated circuit

An example of how to control a Yaesu FT-817 with an Arduino to make a multi-band CW beacon.

GPS module for Yaesu VX-8DR/DE handheld transceivers with ublox NEO-6M chip and Arduino Nano.

Expeimenting with DSP digital signal processing on Arduino

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.