📻 SDR Experiments Collection

A collection of beginner Software Defined Radio (SDR) experiments using GNU Radio and RTL-SDR v4 dongles. These projects explore basic SDR concepts including signal acquisition, filtering, demodulation, and signal visualization.

🎯 Project Overview

This repository contains starter SDR experiments created while learning GNU Radio fundamentals. Each experiment focuses on different radio reception scenarios and demonstrates basic signal processing workflows.

🧪 Experiments

first/ - Basic FM Radio Receiver

Simple FM radio receiver demonstrating fundamental SDR processing chain with spectrum visualization.

fm-radio/ - FM Radio with Dual Visualization

FM radio receiver with frequency spectrum and waterfall displays, plus adjustable volume control.

ham-radio/ - HAM Radio Receiver for 2m Band (144-148 MHz)

Amateur radio receiver adapted for VHF band with narrowband FM demodulation and adjustable filtering.

🛠️ Hardware Requirements

• RTL-SDR v4 Dongle (or compatible RTL-SDR device)
• Antenna appropriate for target frequencies
• Computer with GNU Radio installed

📚 Software Dependencies

• GNU Radio (3.8+ recommended)
• SoapySDR with RTL-SDR support
• Python 3 with GNU Radio Python bindings

🚀 Getting Started

1. Install GNU Radio and dependencies
2. Connect your RTL-SDR v4 dongle
3. Navigate to any experiment folder
4. Open the .grc file in GNU Radio Companion
5. Generate and run the flowgraph

📊 Frequency Coverage

• FM Radio: 85-108 MHz (commercial FM broadcast band)
• HAM Radio: 144-148 MHz (2-meter amateur radio band)

📝 Documentation

Each experiment folder contains:

• Block explanations and configurations
• Signal flow diagrams
• User interface screenshots
• Parameter descriptions
• Learning objectives