AM Transmitters Collection

 4-Pin Crystal Oscillator AM Transmitter | DSB Transmitter | 7MHz CW / AM QRP Transmitter | Sovina2 40M Class E Transmitter | series modulated AM QRP HF Transmitter | one watt AM transmitter | Class C – AM Transmitter | Series Modulated AM Transmitter | Micro Power AM Transmitter! | Steve Quest’s Simple AM Transmitter | 40M AM Transmitter | Grenade AM Transmitter Circuit | Commando AM Transmitter | IRF510 AM Transmitter | 3-Watt AM Radio Transmitter | 27MHz AM Transmitter | 1 MHz AM Transmitter

FM Transmitters Collection

 Mini FM Radio Transmitter | Simple FM Band Transmitter | 90MHz Crystal Controlled FM Transmitter | FM Transmitter Using BC547 | FM Bug Transmitter | Miniature FM Transmitter | Tiny FM Transmitter | Powerful FM Radio Bug Transmitter

VHF/UHF Antennas collection

 High-Gain 5/8 Wave Mobile Antenna  | 3-Element 433 MHz Yagi Antenna  | G5RV Antenna for 145 MHz  | Directional Slim Jim Antenna  | VHF Slingshot Antenna  | OSJ Dual-Band Antenna  | Double Dipole Antenna  | V-dipole antenna for weather satellites reception  | 145 MHZ Delta Loop  | Popovic Dual Band Antenna  | High Gain Collinear Antenna  | FBK Sleeve Antenna  | Coaxial Collinear Antenna  | ZED Dipole Antenna  | VHF Sleeve Dipole Antenna  | Broadband Avia Antenna  | Square Loop Antenna  | Broadband Butterfly Antenna  | Dual-Band RW4HFN Antenna  | High-Gain collinear antenna  | Sleeve Dipole Antenn  | Stacked 5/8-wave VHF Antenna  | 3-Element Yagi antenna UHF  | 5/4 Wave VHF Antenna  | VHF Collinear J-Pole  | 3 x 5/8 Collinear antenna  | Twin-Lead J-Pole Antenna  | J-Pole Antenna Using 300 Ω TV Ribbon  | Hourglass Loop Antenna  | Hotel Antenna for 2 Meter  | Full Wave Loop Antenna for VHF  | Bi-Square Antenna

HF Wire Antennas collections

 40-10m OCF Antenna  | Windom Antenna for 80-10 | Compact 40M Magnetic Loop Antenna |  The Mini G5RV Antenna  |  Shorty 4020 Antenna |  Multiband OCF Dipole |  Double Dipole Antenna for 80–10 |  20m Stealth Antenna |  80 Meter Short Dipole Antenna |  Open Sleeve Dipole Antenna for 40-20 |  Shortened EFHW Antenna |  3-Band HF Antenna |  City Windom Antenna |  20 Meter Folded Dipole Antenna |  Low Height Loop Antenna |  T2FD Antenna: |  30m/40m Dual-Band Delta Loop antenna |  Doublet Dipole Antenna for 80m to 15m |  Trapped Delta Loop Antenna |  Folded Beverage Antenna |  Small Magnetic Loop |  Super Mini Loop Antenna |  Half Square Antenna |  Shortwave Transmitter |   Rockloop HF Antenna |  Foldaway Loop antenna |  Terminated End Fed Vee Antenna |  Half Rhombic antenna |  Optimized sloper antenna for 3.5Mhz |  Multiband Half wave end fed antenna |  80M Trapped dipole antenna |  Short linear loaded HF antenna |   Terminated Mini Loop Antenna |   Signal Booster enhancing Rx |   DIY Active Antenna |   HF Delta Loop Antenna |   Capacitor Loaded Shortened Dipole Antenna |   Aperiodic Multiband Wire Antenna |   GM4JMU Shortened Dipole |   Indoor Antenna for 7 MHz HF Band |   Shorty Forty Antenna |   Building End Fed Half Wave antenna |   Shortened G5RV Antenna |   Loaded Loop Antenna |   Twin Delta Loop Antenna |   Multiband G5RV Antenna |   Shortened Inverted V Antenna |   Reduced Size 40M Antenna |   Morgain Antenna |   Wideband CMC Choke |   Shortened 40-Meter Delta Loop |   RA9SUS Simple Loop Antenna |   RW4HFN Balcony Antenna |   W5GI Multiband Collinear Antenna |   Bazooka Coaxial Dipole Antenna |   9:1 UN-UN |   4:1 UN-UN |   20–40–80 Meter Loaded Multiband Antenna |   Multiband Dipole Antenna |   Double Bazooka Antenna |   Moxon Beam Antenna |   HF Half Loop Antenna |   Lazy-H Antenna |   94-Foot Multi Band Doublet |   W3DZZ Multi-Band Antenna |   80m Magnetic Loop |   Fan Dipole Antenna |   The Half Square Antenna

WebFT8: Running FT8 Straight From Your Browser

WebFT8: Running FT8 Straight From Your Browser: WebFT8 brings FT8 decoding, waterfall display, and logging into your browser. Here's how it works and what it means for portable ham radio operators.

Building Sovina 40M Class E CW Transmitter with BS170 MOSFETs

The Sovina 40m Class-E CW Transmitter is a compact and highly efficient HF transmitter designed specifically for amateur radio operators who enjoy homebrew QRP equipment. This circuit is based on the original work by PY2OHH (Roberto S. Soria) and has become popular due to its simplicity, excellent efficiency, and clean RF output. This CW Transmitter is particularly noted for its reliability and performance.

Building Sovina 40M Class E CW Transmitter with BS170 MOSFETs

ATS Mini Firmware Now Supports LILYGO T-Embed SI4732

ATS Mini Firmware Now Supports LILYGO T-Embed SI4732: ATS Mini firmware v2.34 now includes experimental support for the LILYGO T-Embed SI4732 receiver. Here is what the hardware does, how ATS Mini firmware works,

Build a High-Precision DIY RF Current Sniffer

 Stop RF interference in its tracks. Learn how to build two versions of the RF Current Sniffer to detect common-mode current and optimize your ham radio antenna.Every Amateur Radio operator has faced the “invisible enemy”: Common-Mode Current (CMC). It’s that stray RF energy crawling back down the outside of your coaxial cable shield, wreaking havoc on your equipment. It causes “hot” microphones that sting your lips, resets your computer during a transmission, and creates erratic SWR readings that defy logic.
To fight this, you need more than just guesswork; you need a tool that can “see” the current on the outside of the line. Based on the designs popularized in the Antentop 01-2020 journal, we are going to look at how to build two versions of a simple, non-invasive RF Current Sniffer. Whether you prefer the visual precision of an analog needle or the quick “go/no-go” simplicity of an LED, these circuits are essential additions to your workbench.

Build a High-Precision DIY RF Current Sniffer:

Meshtastic Ham Radio Guide: LoRa Mesh Networking for Emergency and Everyday Use

Meshtastic Ham Radio Guide: LoRa Mesh Networking for Emergency and Everyday Use: Meshtastic ham radio brings LoRa-based off-grid mesh networking. Learn how it works, how to get started, and why emergency comms operators paying attention.

FT2 Digital Mode in 2026 — The Fastest Thing on HF and What the Community Really Thinks

FT2 Digital Mode in 2026 — The Fastest Thing on HF and What the Community Really Thinks: FT2 digital mode reviewed in 2026 — 3.8-second cycles, real shack experiences, technical trade-offs, and whether it deserves a place in your station

Build Your Own Indoor Antenna for 7 MHz HF Band

Build Your Own Indoor Antenna for 7 MHz HF Band: Discover how to build a compact indoor antenna for 7 MHz using a simple coil-based design. Ideal for amateur radio operators with space constraints

Practical guide to receiving HF weather fax WEFAX / Radiofax

Practical guide to receiving HF weather fax WEFAX / Radiofax: Learn how to receive HF Weather Fax (WEFAX) images using SDR or shortwave radios. Step-by-step guide for radio amateurs with frequencies, software tools,

Baofeng UV-5R Mini: Compact Dual-Band Powerhouse

Baofeng UV-5R Mini: Compact Dual-Band Powerhouse: A technical review of the Baofeng UV-5R Mini. 5W output, Bluetooth programming, and "FT2" digital mode experiment. Is it the new speed king of ultra-portables?

Setting Up SSTV with HF SSB Transceivers: A Comprehensive Guide

Setting Up SSTV with HF SSB Transceivers: A Comprehensive Guide: Master SSTV setup with uBITX/sBITX transceivers. Audio interfacing, PTT control, software config, troubleshooting. MMSSTV, QSSTV guides included.

UR0GT Broadband Avia Antenna (RW4HVN Mod): The Ultimate Wideband VHF Antenna Guide

UR0GT Broadband Avia Antenna (RW4HVN Mod): The Ultimate Wideband VHF Antenna Guide: Detailed guide to building UR0GT Broadband Avia Antenna modified by RW4HVN. Covers dimensions, design principles, SWR performance, construction details

Radio Waves Weekly — Issue #003

Radio Waves Weekly — Issue #003: Sunday, February 08, 2026 Welcome to the third edition of our weekly digest! We are tracking the peak of Solar Cycle 25 and highlighting some incredible local and global engineering projects. 🔝 Top Links of the Week 1. ARRL Becomes Supporting Partner for America250 The ARRL has officially joined "America250" to celebrate the 250th anniversary

Getting Started with FreeDV: A Beginner’s Guide to Digital Voice on Amateur Radio

Getting Started with FreeDV: A Beginner’s Guide to Digital Voice on Amateur Radio: Learn FreeDV digital voice for amateur radio. Beginner's guide covers setup, equipment, modes, and making your first contact using open-source software.

If you’re an amateur radio operator looking to explore digital voice modes beyond the usual FM repeaters, FreeDV offers an exciting opportunity to experiment with open-source digital communication. This guide will help you understand what FreeDV is, why it matters, and how to get started with this fascinating mode.

Building Sovina 40M Class E CW Transmitter with BS170 MOSFETs

Building Sovina 40M Class E CW Transmitter with BS170 MOSFETs: High-efficiency 40M CW Class-E CW transmitter using BS170 MOSFETs and 74HC02. Complete circuit explanation and build notes for QRP hams.

The Sovina 40m Class-E CW Transmitter is a compact and highly efficient HF CW transmitter designed for amateur radio operators who enjoy homebrew QRP equipment. This circuit is based on the original work by PY2OHH (Roberto S. Soria) and has become popular due to its simplicity, excellent efficiency, and clean RF output.

Build a Powerful FM Radio Bug Transmitter

Build a Powerful FM Radio Bug Transmitter: guide on building a high-performance FM radio bug transmitter using BC547 and 2N3563 transistors. Explore RF electronics with this powerful 100MHz DIY project.

For electronics hobbyists, few projects are as rewarding as mastering Radio Frequency (RF) design. This Powerful FM Radio Bug Transmitter is a classic, high-performance circuit that offers a significant step up from basic single-transistor designs. Operating on the 100 MHz FM band, it provides a robust and clear signal suitable for various wireless audio applications.

Tree Mounted Quarter-Wave Vertical Antenna

Tree Mounted Quarter-Wave Vertical Antenna: Technical explanation of a tree-mounted quarter-wave vertical antenna using only two sloping radials. Covers working principle, feed impedance and construction,

LinHT SDR: Open-Source Linux-Based Handheld Software Defined Radio for Amateur Enthusiasts

LinHT SDR: Open-Source Linux-Based Handheld Software Defined Radio for Amateur Enthusiasts: LinHT SDR — a next-generation open-source, Linux-powered software defined transceiver designed for amateur radio, experimentation, flexibility, and hackability.

Software Defined Radio technology has revolutionized base station infrastructure, laboratory-grade receivers, and bench equipment for years, yet handheld transceivers have stubbornly clung to traditional fixed-function architectures. The LinHT SDR shatters this paradigm entirely, delivering a genuine software-defined transceiver in a genuinely portable package. Built on Linux foundations, designed around open hardware principles, and architected for profound experimentation rather than appliance-level consumer operation, LinHT represents something fundamentally different.