RF/SDR/Communications
Software defined radio, DragonOS, Flipper Zero, HAM radio licensing, and RF communications resources.
Getting Started
| Resource | Description |
|---|---|
| Software Defined Radios (SDRs) | Introduction to SDR concepts and hardware |
| DragonOS | Pre-configured Linux for SDR operations |
| HAM Radio | Amateur radio licensing and resources |
Software Defined Radio (SDR)
What is SDR?
Software-defined radio (SDR) is a radio communication system where components traditionally implemented in analog hardware (mixers, filters, amplifiers, modulators/demodulators) are instead implemented using software on a computer or embedded system.
SDR Hardware
| Device | Use Case | Notes |
|---|---|---|
| RTL-SDR | Entry-level | Receive only, inexpensive |
| HackRF One | General purpose | Transmit and receive, wide frequency range |
| PlutoSDR | Learning/Teaching | Great with PySDR, networkable, FPGA capable |
| LimeSDR | Advanced | Full duplex, high bandwidth |
| BladeRF | Professional | High performance |
Getting Started with SDR
Recommended for Learning: PlutoSDR + PySDR
- Can be networked for remote learning
- Supports Maia firmware for 50MHz+ spectrum via FPGA
- Can be hacked for LTE support
- Available at Mouser Electronics
SDR Software & Platforms
- DragonOS - Pre-configured Linux with SDR software suite
- GNU Radio - Open-source signal processing toolkit
- SDR++ - Cross-platform SDR software
- GQRX - Open source SDR receiver
DragonOS
DragonOS leverages Lubuntu Linux as a delivery package for pre-installed open-source SDR software.
Supported Platforms
| Platform | Notes |
|---|---|
| VirtualBox | Virtualized |
| VMware | Virtualized |
| Raspberry Pi 3/4 | Native ARM |
| Intel | Native x86 |
Installation
- Download from SourceForge
- Prepare USB with Ventoy or Etcher
- Boot from live image or install dual-boot
DragonOS Resources
- DragonOS Guide - Full installation and usage guide
- YouTube Channel - Video tutorials
- Discord Community
- Matrix Channels
Pre-configured Products
- WarDragon Kit+ - Ready-to-use SDR kit
HAM Radio
License Classes (US)
| License | Privileges | Exam |
|---|---|---|
| Technician | VHF/UHF, local/regional comms | 35 questions |
| General | HF privileges, worldwide comms | 35 questions |
| Amateur Extra | All privileges, all bands | 50 questions |
Licenses valid for 10 years. See ARRL Getting Licensed.
Study Resources
| Resource | Link |
|---|---|
| Ham Cram | ham-cram.com |
| ARRL Exam Practice | arrl.org/exam-practice |
| Technician Anki Deck | Anki Flashcards |
| Extra Class Anki Deck | Anki Flashcards |
Find Exam Sessions
ARRL Exam Session Finder - In-person and online testing
See: HAM Radio Guide
Flipper Zero
Flipper Zero - Multi-tool device for pentesters and RF enthusiasts.
Resources
- Flipc.org - Collection of Flipper Zero applications
- GitHub: fap-list - .fap files built automatically
Radio Operations
- Radio Checks - Proper radio check procedures
Related Topics
Electronic Warfare
SDR knowledge applies to understanding EW concepts:
- Signal analysis and identification
- Spectrum monitoring
- Communications security
Unmanned Systems
RF knowledge is critical for:
- Command and control links (ELRS, Crossfire)
- Video transmission (5.8GHz FPV)
- GPS/GNSS systems
- Counter-UAS jamming
See: Unmanned Systems
References
Books
- Dillinger, Markus et al. (2003). Software Defined Radio: Architectures, Systems, and Functions. Wiley & Sons.
- Amaral, Cristiano (2021). Guia Moderno do Radioescuta. Brazil: Amazon.
External Resources
Related Pages
- Unmanned Systems - RF links for drones
- Counter-UxS - Electronic warfare concepts
- Certifications - RF/EW certifications