Home About Resources Blog Contact
Curated & Updated Regularly

Your Radio Resource Hub

A carefully curated collection of websites, tools, and learning materials for everyone.

Editor's Picks

Featured This Month

Staff Pick · Website
RTL-SDR Blog
Your destination for RTL-SDR news, tutorials, and project showcases. Covers almost everything, from satellite reception to aircraft tracking.
Visit Site
Software · Staff Pick
GQRX SDR Receiver
Open-source SDR receiver for Linux and macOS. Intuitive spectrum display and demodulation for beginners and professionals.
Reference · Lori's Favorite
Signal Identification Wiki
Crowdsourced database of audio and waterfall samples for identifying unknown signals. An indispensable reference tool.
Essential Websites
RS
rtl-sdr.com
RTL-SDR Blog
rtl-sdr.com
News, tutorials, and project guides for RTL-SDR and software-defined radio. The most active SDR news site on the web, updated almost daily.
SDRTutorialsNews
SW
sigidwiki.com
Signal Identification Wiki
sigidwiki.com
Crowdsourced database of thousands of signal types with audio samples and waterfall screenshots. Your go-to for identifying unknown RF transmissions.
ReferenceSignal ID
AR
arrl.org
ARRL - American Radio Relay League
arrl.org
The national association for amateur radio. Licensing resources, technical publications, band plans, and support for the amateur radio community.
Amateur RadioLicensingStandards
RR
radioreference.com
RadioReference
radioreference.com
The world's largest radio communications data provider. Frequency databases, trunked system information, and a live scanner feed aggregator.
FrequenciesDatabaseScanner
GT
globaltuners.com
Global Tuners
globaltuners.com
Remote access to real radio receivers around the world. Tune in to frequencies from dozens of countries directly in your browser - no hardware needed.
Remote RXSWL
DX
dxwatch.com
DX Watch
dxwatch.com
Real-time DX cluster for HF operators. Live spots from stations around the world, band-by-band propagation data, and contest activity tracking.
DXHFPropagation
Software & Tools
Windows · Free
SDR++
The most popular SDR application for Windows. Wide hardware support, plugin ecosystem, and an active user community.
Linux / macOS · Free
GQRX
Open-source SDR receiver with a clean spectrum display. The standard choice for Linux-based radio listening and monitoring.
Cross-platform · Free
GNU Radio
Powerful visual flowgraph-based DSP development environment. The industry standard for prototyping and deploying radio applications.
Windows · Free
SDRuno
Professional SDR application from SDRplay with advanced features including multi-channel reception, RDS decoding, and ADS-B.
Cross-platform · Free
Fldigi
Digital mode decoder and encoder for amateur radio. Supports PSK31, RTTY, CW, Olivia, and dozens more digital communication modes.
Web + Desktop · Free
WSPR Net
Weak Signal Propagation Reporter network. Map real-time HF propagation worldwide using ultra-low-power beacon transmissions.
Windows · Free
Virtual Radar Server
Decodes ADS-B signals from your SDR and displays live aircraft positions on an interactive map in your browser. Excellent for aviation enthusiasts.
Cross-platform · Free
CHIRP
Free open-source radio programming tool. Programs frequencies, tone codes, and settings into hundreds of handheld radio models via a simple spreadsheet interface.
Learning Materials
Interactive Book
PySDR: A Guide to SDR and DSP Using Python
Free online textbook covering digital signal processing and SDR fundamentals using Python and NumPy. Excellent blend of theory and hands-on coding.
🎓 Beginner – Intermediate Read Free
YouTube Channel
Signals Everywhere
Prolific YouTube channel covering SDR projects, signal decoding walkthroughs, hardware reviews, and real-world radio monitoring experiments.
🎓 All Levels Watch
Reference Book
ARRL Handbook for Radio Communications
The definitive technical reference for amateur radio. Covers electronics fundamentals, circuit design, antennas, propagation, and operating procedures.
🎓 Intermediate – Advanced View
Video Course · Free
Software Defined Radio with HackRF
Michael Ossmann's acclaimed free video course covering SDR from ground up. Starts with analog radio fundamentals and builds up to complex digital modulation techniques.
🎓 Beginner – Advanced Watch Free
Practice Exams
Ham Radio Prep
Study platform for FCC amateur radio licensing exams (Technician, General, Extra). Adaptive practice questions, video lessons, and progress tracking for exam preparation.
🎓 Beginner Study
Wiki & Tutorials
GNU Radio Tutorials
Official GNU Radio wiki tutorials from absolute beginner to advanced flowgraph design. Essential for anyone wanting to build custom signal processing pipelines.
🎓 Intermediate – Advanced Read
Help Us Grow

Know a Great Resource?

Our resource library is community-maintained. If you've found a website or tool that belongs here, we'd love to hear about it. All submissions are reviewed by us before being listed.

Submit a Resource
Quick Review
Submissions are reviewed within 48 hours by Markus and Lori.
Quality Vetted
We test every resource before listing it. All the dead links and the outdated content are removed monthly.
Credit Given
Contributors who suggest accepted resources are credited in the resource description.
Stay Updated

Get Signals Straight to Your Inbox

New articles, tutorials, and resources. No noise - just signal.