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A Broadband Butterfly Antenna for VHF and UHF vu3dxr.in/a-broadband-...
A Broadband Butterfly Antenna for VHF and UHF
Learn about the Square Loop Antenna (also called the butterfly antenna), a simple, broadband, bidirectional antenna with excellent gain.
vu3dxr.in
December 3, 2025 at 10:12 AM
A Broadband Butterfly Antenna for VHF and UHF vu3dxr.in/a-broadband-...
DIY Wideband CMC Choke Using Steel Wool and RG-213 – A Simple Common-Mode Filter vu3dxr.in/diy-wideband...
DIY Wideband CMC Choke Using Steel Wool and RG-213
Build a highly effective, wideband Common-Mode Current CMC choke using steel wool , RG-213 coax and a PVC tube. Learn how this resistive–absorptive choke
vu3dxr.in
December 3, 2025 at 7:23 AM
DIY Wideband CMC Choke Using Steel Wool and RG-213 – A Simple Common-Mode Filter vu3dxr.in/diy-wideband...
DIY 145 MHz Twin Delta Loop Antenna for Ham Radio Operators vu3dxr.in/diy-145-mhz-...
DIY 145 MHz Twin Delta Loop Antenna for Ham Radio Operators
A complete guide to building 145 MHz Twin Delta Loop antenna with dimensions, construction tips, feeding method, and performance advantages for VHF ham radio.
vu3dxr.in
December 3, 2025 at 5:15 AM
DIY 145 MHz Twin Delta Loop Antenna for Ham Radio Operators vu3dxr.in/diy-145-mhz-...
VHF Radio Receiver Antenna Amplifier Using MAX2633 – Simple Low-Noise RF Preamplifier Design vu3dxr.in/vhf-radio-re...
VHF Radio Receiver Antenna Amplifier Using MAX2633
A complete guide to building a VHF radio receiver antenna amplifier using the MAX2633 low-noise RF preamplifier chip with schematic explanation
vu3dxr.in
December 2, 2025 at 10:26 AM
VHF Radio Receiver Antenna Amplifier Using MAX2633 – Simple Low-Noise RF Preamplifier Design vu3dxr.in/vhf-radio-re...
PhaseLatch Mini: An Affordable STM32-Based SDR Digitizer for Radio Experimenters vu3dxr.in/phaselatch-m...
PhaseLatch Mini: An Affordable STM32-Based SDR Digitizer
PhaseLatch Mini is an STM32-based SDR digitizer with dual 12-bit ADCs and 210 kS/s USB I/Q streaming for ham radio, HF/VHF listening, and SDR experimentation.
vu3dxr.in
December 2, 2025 at 6:43 AM
PhaseLatch Mini: An Affordable STM32-Based SDR Digitizer for Radio Experimenters vu3dxr.in/phaselatch-m...
Square Loop Antenna for 144/430 MHz – Complete DIY Dual-Band Build Guide vu3dxr.in/square-loop-...
Square Loop Antenna for 144/430 MHz – Complete DIY Dual-Band Build Guide
Dual-band 144/430 MHz square loop antenna design with full dimensions, gain performance, materials, and DIY construction guide for VHF/UHF amateur radio.
vu3dxr.in
December 1, 2025 at 11:46 AM
Square Loop Antenna for 144/430 MHz – Complete DIY Dual-Band Build Guide vu3dxr.in/square-loop-...
Simple CW 74HC240 Transmitter using buffer IC vu3dxr.in/simple-cw-tr...
Simple CW 74HC240 Transmitter using buffer IC
This is a simple but effective CW 74HC240 transmitter design using a octal buffer IC 74HC240 as the main component, operates at 7.023 MHz .
vu3dxr.in
November 28, 2025 at 9:04 AM
Simple CW 74HC240 Transmitter using buffer IC vu3dxr.in/simple-cw-tr...
Shrinking the Dipole: Building the Shorty Forty Antenna for 40M Band vu3dxr.in/shrinking-th...
Shrinking the Dipole: The Shorty Forty Antenna for 40M Band
Build a short dipole antenna for the 7 MHz ham radio band. The Shorty Forty design uses loading coils to deliver strong 40-meter performance in limited space.
vu3dxr.in
November 28, 2025 at 8:58 AM
Shrinking the Dipole: Building the Shorty Forty Antenna for 40M Band vu3dxr.in/shrinking-th...
Shortened G5RV Antenna – DX Power in a Smaller Package vu3dxr.in/shortened-g5...
Shortened G5RV Antenna - DX Power in a Smaller Package
A compact, multi-band wire antenna based on the legendary G5RV design —specifically, a shortened version of G5RV antenna optimized for the 14-50 MHz range.
vu3dxr.in
November 28, 2025 at 8:56 AM
Shortened G5RV Antenna – DX Power in a Smaller Package vu3dxr.in/shortened-g5...
Morgain Antenna: Dual-Band Dipole that Beats Traps vu3dxr.in/morgain-ante...
Morgain Antenna: Dual-Band Dipole that Beats Traps
Build high-performance HF Morgain antenna with accurate dimensions and simple construction. Complete guide with diagrams, spacing, materials, and tuning tips.
vu3dxr.in
November 27, 2025 at 8:46 AM
Morgain Antenna: Dual-Band Dipole that Beats Traps vu3dxr.in/morgain-ante...
How to Build a Reduced Size 40M Antenna – Complete DIY Guide vu3dxr.in/how-to-build...
How to Build a Reduced Size 40M Antenna – Complete DIY Guide
Build a compact reduced Size 40M Antenna using PVC spacers and simple materials. Get full measurements, design diagram, assembly steps, and tuning tips
vu3dxr.in
November 27, 2025 at 5:59 AM
How to Build a Reduced Size 40M Antenna – Complete DIY Guide vu3dxr.in/how-to-build...
Shortened Inverted V Antenna for 80 Meters (3.700 MHz) vu3dxr.in/shortened-in...
Shortened Inverted V Antenna for 80 Meters (3.700 MHz)
Build a high-performance shortened inverted V antenna for 80 meters. Compact design, loading coils, measurements, and installation guide for strong HF signals.
vu3dxr.in
November 26, 2025 at 9:59 AM
Shortened Inverted V Antenna for 80 Meters (3.700 MHz) vu3dxr.in/shortened-in...
Build a Simple Speech Processor Circuit Using LM358 vu3dxr.in/build-a-simp...
Build a Simple Speech Processor Circuit Using LM358
Learn how to build a simple speech processor circuit using LM358 op-amp. Ideal for amateur radio, audio processing, and voice compression application.
vu3dxr.in
November 26, 2025 at 6:18 AM
Build a Simple Speech Processor Circuit Using LM358 vu3dxr.in/build-a-simp...
NJM4558 Audio Compressor Circuit: Complete Schematic & Build Guide vu3dxr.in/njm4558-audi...
NJM4558 Audio Compressor Circuit: Complete Build Guide
The NJM4558 audio compressor circuit shown in the schematic demonstrates a sophisticated approach to dynamic range control.
vu3dxr.in
November 26, 2025 at 6:15 AM
NJM4558 Audio Compressor Circuit: Complete Schematic & Build Guide vu3dxr.in/njm4558-audi...
TL081 Speech Processor for HF Rigs vu3dxr.in/tl081-speech...
vu3dxr.in
November 26, 2025 at 6:06 AM
TL081 Speech Processor for HF Rigs vu3dxr.in/tl081-speech...
Building Steve Quest’s Simple AM Transmitter vu3dxr.in/building-ste...
Building Steve Quest AM Transmitter
Steve Quest AM Transmitter, a popular and relatively straightforward design for hobbyists. It is a is fun to build and teaches basic radio principles
vu3dxr.in
November 22, 2025 at 4:44 AM
Building Steve Quest’s Simple AM Transmitter vu3dxr.in/building-ste...
Build Your Own Grenade AM Transmitter Circuit: A Complete Guide vu3dxr.in/build-your-o...
Build Your Own Grenade AM Transmitter : A Complete Guide
The Grenade AM transmitter is a fascinating DIY electronics project that combines simplicity with effective radio frequency transmission.
vu3dxr.in
November 22, 2025 at 4:40 AM
Build Your Own Grenade AM Transmitter Circuit: A Complete Guide vu3dxr.in/build-your-o...
Build a Simple FM Band Transmitter Circuit vu3dxr.in/build-a-simp...
Build a Simple FM Band Transmitter Circuit
This simple FM band Transmitter circuit offers an excellent starting point for beginners can build this transmitter using common electronic components
vu3dxr.in
November 21, 2025 at 9:20 AM
Build a Simple FM Band Transmitter Circuit vu3dxr.in/build-a-simp...
Build Your Own 90MHz Crystal Controlled FM Transmitter vu3dxr.in/build-your-o...
Build Your Own 90MHz Crystal Controlled FM Transmitter
A crystal controlled FM transmitter is a radio frequency circuit that uses quartz crystal oscillator to generate a stable, precise frequency for FM transmission
vu3dxr.in
November 21, 2025 at 9:18 AM
Build Your Own 90MHz Crystal Controlled FM Transmitter vu3dxr.in/build-your-o...
Build Your Own 80M CW Transmitter from Scratch vu3dxr.in/build-your-o...
Build Your Own 80M CW Transmitter from Scratch
Learn to build a simple 80M CW transmitter with crystal oscillator and parallel power amplifier. Complete circuit guide for amateur radio enthusiasts
vu3dxr.in
November 21, 2025 at 9:06 AM
Build Your Own 80M CW Transmitter from Scratch vu3dxr.in/build-your-o...
80 meter 1W QRP Transmitter with Ceramic Resonator Control vu3dxr.in/80-meter-1w-...
80 meter 1W QRP Transmitter with Ceramic Resonator Control
80 meter 1W QRP Transmitter with Ceramic Resonator Control delivers 1 watt of power across the 80-meter band (3.52 to 3.59 MHz) with frequency stability
vu3dxr.in
November 21, 2025 at 9:05 AM
80 meter 1W QRP Transmitter with Ceramic Resonator Control vu3dxr.in/80-meter-1w-...
Aperiodic Multiband Wire Antenna: A Simple and Effective Design vu3dxr.in/aperiodic-mu...
Aperiodic Multiband Wire Antenna: A Simple Effective Design
Learn about the DK7ZB and HB9KX aperiodic multiband wire antenna. This simple, no-tuner design uses a 100-ohm resistor to operate across multiple HF bands
vu3dxr.in
November 21, 2025 at 9:01 AM
Aperiodic Multiband Wire Antenna: A Simple and Effective Design vu3dxr.in/aperiodic-mu...