This is a fully assembled and tested digital RF Power & SWR (Standing Wave Ratio) Meter based on the popular Arduino platform, ideal for amateur radio enthusiasts, makers, and RF experimenters. Designed by ON7EQ and built with care, this unit provides accurate real-time monitoring of forward and reflected power, along with SWR calculations, on a clear digital display.

Perfect for bench testing, antenna tuning, or portable operation, this meter is compact, reliable, and easy to use with your existing RF setup.

✅ Features:

📟 LCD Display with Timeout Real-time digital readout of forward power, reflected power, and calculated SWR. Backed with a lcd timeout to save battery life.

📶 Wide Power Range Measures from approximately 0.5W up to 260W (depending on the directional coupler used).(Max 5v In -FWD - REF)

⚙️ Based on Arduino Nano Easily upgradable firmware and open-source code support for customization.

🔌 Built-in Calibration Table Linearized readings using software correction via stored calibration values.

📏 Selectable Power Ranges Supports two user-selectable measurement ranges: LOW and HIGH.

🔄 True SWR Calculation SWR is calculated using the actual formula rather than approximation.

🔧 Directional Coupler Compatible Works with most standard RF couplers (not included), allowing integration with your station setup.

🔋 Low Power Operation Powered via 9-12v or battery powered for portable use.

📦 Assembled & Tested

Each unit is hand-assembled, flashed, calibrated, and tested prior to shipping.

🧰 What You Get:

1× Fully assembled Arduino SWR & Power Meter (as per ON7EQ’s design)

Pre-programmed AVR AtMega328P with firmware

Pre-wired for easy connection to your directional coupler

Note: Directional coupler, RF connectors, and enclosure not included.

📡 Ideal For: Ham radio operators (HF/VHF/UHF)

Antenna tuning and testing

RF circuit design and experimentation

Makers and homebrew radio builders

Make antenna tuning smarter and cleaner – with real-time SWR and power readings in your shack or field kit!