RA4NAL Arduino Uno VNA User Manual

About this manual

This manual describes a DIY vector network analyzer built around an Arduino Uno and a DDS AD9851 module. It explains the circuit design, component selection, and assembly of the measurement module, including the custom tandem‑match transformer and the AD8302 detector.

The document also provides step‑by‑step instructions for installing the Arduino firmware, configuring the PC software (IG_MiniVNA and vna/J), and performing calibration of frequency, reflection and transmission. Practical tips for using a USB‑powered setup, measuring antenna SWR, impedance and cable parameters are included. This manual is written in Russian.

What's inside

• Introduction
• Hardware Overview
• Circuit Description
• Assembly Instructions
• Arduino Firmware Upload
• Software Installation
• Calibration Procedure
• Operation and Measurements

Specifications

Frequently asked questions

How do I upload the firmware to the Arduino board?

Use XLoader to select the HEX file (vna328.hex) and click Upload; press the reset button on the board briefly if needed.

Which detector chip is used for measuring amplitude and phase?

The AD8302 from Analog Devices provides two analog outputs for amplitude ratio and phase difference.

How is the VNA calibrated?

In the IG_MiniVNA software open the Configure menu and run Calibrate Reflection and Calibrate Transmission, adjusting the tandem‑match as instructed.