DXR Electronics Bits And Resources

The ATS Mini series represents one of the most innovative developments in pocket-sized DSP receivers for shortwave enthusiasts and ham radio operators. Built around the Silicon Labs SI4732 DSP chip and ESP32 microcontroller, these tiny radios pack remarkable functionality into an incredibly compact form factor. Let’s explore the technical evolution across all versions, from the original V1 to the latest V4. Built around the Si4732 chip and powered by an ESP32, each iteration has addressed hardware bottlenecks, from audio quality to RF interference

Circuits DIY radio Reception Tools

Build a High-Sensitivity Regenerative Receiver with 2N7000 MOSFET

January 28, 2026April 8, 2026PrabakaranComment(0)

The 2N7000 regenerative receiver is a classic single-transistor radio that combines simplicity with surprisingly high sensitivity. By using controlled positive feedback, the circuit operates just below oscillation, dramatically increasing gain and selectivity.

Antenna DIY VHF/UHF

Full Wave Loop Antenna for VHF UHF FM Radio Bands

January 27, 2026April 8, 2026PrabakaranComment(0)

Learn how to build a high-performance Full-Wave Loop Antenna for VHF and UHF FM radio bands. This DIY guide covers dimensions, polarization, and impedance matching for clear local communication and FM broadcast reception.

Antenna DIY Tools

DIY Moxon Rectangle Beam Antenna for 10m, 15m, and 20m Bands

January 25, 2026April 8, 2026PrabakaranComment(0)

Master the DIY Moxon Rectangle Beam antenna. Detailed guide on dimensions, design, and calculations for 14MHz, 21MHz, and 28MHz ham radio bands.

Radio Waves Weekly

Radio Waves Weekly Digest — Issue #001

January 25, 2026April 20, 2026PrabakaranComment(0)

Welcome to the first issue of Radio Waves Weekly! This is a curated digest of the most interesting news, DIY projects, and tools from the world of Amateur Radio, SDR, and RF electronics.

Articles Guide HF News QRP radio

Building the LARCSet v3.0: Real-World Problems and Proven Fixes from the BITX20 Community

January 23, 2026April 8, 2026PrabakaranComment(0)

Troubleshooting guide for the LARCSet V3.0 40 m SSB/CW transceiver kit covering common failures, low mic gain, tuning issues, and PA faults. Community-proven fixes and mods from BITX20 builders improve stability, audio, and output power.

Circuits CW DIY HF QRP Transmitter

Mighty Mite 5W Crystal Controlled QRP CW Transmitter

January 22, 2026April 20, 2026PrabakaranComment(0)

The Mighty Mite 40 Meter QRP CW Transmitter is a legendary low-power Morse code transmitter widely built by amateur radio operators for portable, minimalist, and educational operation.

Articles Digital modes Guide HF Tools

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

January 20, 2026March 15, 2026PrabakaranComment(0)

Beginner’s guide to FreeDV digital voice on HF using an SSB transceiver, computer, and sound-card interface. Learn setup, operating basics, and how open-source Codec2 delivers clear voice communication under weak-signal conditions

Circuits CW DIY HF Transmitter

Building Sovina 40M Class E CW Transmitter with BS170 MOSFETs

January 19, 2026April 20, 2026PrabakaranComment(0)

Build the Sovina 40 m Class-E CW transmitter using BS170 MOSFETs and 74HC02 logic for efficient 7 MHz QRP operation. High-efficiency switching PA delivers 4–7 W output with clean RF and simple crystal-controlled design for homebrew HF rigs.

Circuits QRP Transmitter VHF/UHF

Build a Powerful FM Radio Bug Transmitter

January 19, 2026March 15, 2026PrabakaranComment(0)

Three-stage FM bug transmitter using BC547 audio preamp, RF oscillator/modulator, and 2N3563 power amplifier for strong 100 MHz transmission. High-performance DIY wireless microphone circuit with improved range and signal stability.