Arduino Antenna Analyzer
Antenna analyzer device developed in an amateur radio workshop, using Arduino and AD9850 DDS with VSWR bridge for radio frequency measurements.
About the Project
This project was developed during a workshop led by a fellow amateur radio operator. The device functions as an antenna analyzer, an essential tool for anyone working with radio frequency.
The analyzer allows measuring and evaluating antenna performance, helping to identify tuning problems and optimize transmission efficiency.
Main Components
Arduino
Microcontroller responsible for system control and user interface.
AD9850 - DDS VFO
The AD9850 component acts as a VFO (Variable Frequency Oscillator) using DDS (Direct Digital Synthesis) technology. This technology enables generating radio frequency signals with high precision and stability.
VSWR Bridge
Measurement circuit that calculates the Voltage Standing Wave Ratio (VSWR), a fundamental indicator of antenna efficiency. A good antenna should have a VSWR close to 1:1.
How It Works
The analyzer sweeps through a range of frequencies, measuring VSWR at each point. This allows:
- Identifying the resonant frequency of the antenna
- Evaluating the useful bandwidth
- Detecting tuning or construction issues
- Optimizing performance through informed adjustments
Context
Developed within an amateur radio workshop, this project combines knowledge of:
- Microcontroller programming
- Radio frequency electronics
- Antenna theory
- Measurement instrumentation
It’s a practical and useful tool for any radio amateur who wants to build and optimize their own antennas.
Applications
- Analysis of HF, VHF, and UHF antennas
- Verification of antenna adjustments
- Coaxial cable testing
- Identification of antenna system problems
- Assistance in building new antennas