Simple 29 MHz AM Transmitter
A detailed look at a compact 29 MHz AM transmitter for the 10-meter amateur band,…
Circuits
Transmitter
Latest News
Digital modes
radio
TinyDX: A Palm-Sized HF Digital Modes Transceiver That Fits in Your Pocket
TinyDX is an incredibly compact open-source HF digital modes transceiver designed specifically for FT8 and…
Antenna
HF
Miniature 80-Metre Magnetic Loop Antenna
Discover the compact SM0VPO miniature magnetic loop antenna for the 80-metre amateur band. This guide…
QRP
SDR
Pebble HF: The $50 Open-Source QRP Transceiver That Wants to Get You on HF
Pebble HF is an open-source, single-band 20m QRP transceiver built by the Ham Radio Duo…
Guide
radio
Reception
SDR
Setting Up OpenWebRX with the RTL-SDR V4 Dongle: A Complete Guide
A complete walkthrough of building a web-accessible SDR receiver using the RTL-SDR V4 dongle and…
SDR
sBitx Version 5.4 Released: New FM Mode and Major Performance Improvements
sBitx 5.4 is a major release for this open source HF transceiver, adding FM mode,…
Circuits
HF
Classic 2-Transistor Microphone Compressor
Ever wondered how classic audio gear tames loud volume spikes without complex integrated circuits? This…
Antenna
HF
40-10m OCF Antenna: A Simple, Multi-Band Wire Antenna
Learn how to build a simple and effective 40-10m Off-Center Fed (OCF) Dipole antenna. This…
Circuits
Simple FM Receiver with Audio Amplifier
This guide walks you through a simple FM receiver circuit built around a BF256 FET…
Antenna
Urban HF Antenna Problem: 5 Proven Builds for Small Rooftops
Five space-saving HF antennas for city hams: Mini G5RV, Shorty 4020, UA6CA Windom, Window Loop,…