DIY Antennas, QRP, SDR & Ham Radio Projects from VU3DXR
Explore Software Defined Radio on DXR Electronics Bits, including handheld Linux SDR transceivers, modular SDR digitizers, HackRF-class wideband receivers, and open-source RF platforms. Learn SDR architecture, I/Q sampling, digital signal processing, and practical applications from HF to microwave bands for amateur radio and spectrum analysis
Every vessel larger than 300 gross tons is legally required to broadcast its identity, position, speed, and heading every few seconds on VHF radio. With a $25 RTL-SDR dongle and free software, you can receive, decode, and map those live transmissions from your living room — no licence required, no nautical background needed. This guide walks you through the AIS standard, the hardware and software stack, antenna options, and how to contribute your decoded data to global ship-tracking networks.
Weather Facsimile—commonly known as WEFAX, HF-FAX, or Radiofax—is easily one of the most rewarding niches in the shortwave hobby. There is a certain “magic” in tuning your receiver to a scheduled frequency and watching a high-resolution synoptic chart or satellite image slowly materialize on your screen, line by line, over several minutes.
sBitx v5.3 software update brings a touch-optimized UI, advanced FT8/FT4 automation, xOTA logging, CW decoding upgrades, and SWR protection — enhancing the Linux SDR transceiver platform.
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.
Learn how to integrate JTDX with the sBITX SDR transceiver for reliable FT8 digital operation. Step-by-step setup, CAT configuration, and audio interface tips for amateur radio operators
Explore the sBitx v3 — an open-source Linux SDR transceiver merging computer and HF radio, enabling portable digital operation without a laptop
ZBITX is an ultra-portable 5 W all-band HF SDR transceiver with built-in FT8, CW, and digital modes powered by Raspberry Pi. Pocket-sized QRP radio for POTA/SOTA field operation without a laptop.
PortaRF is a compact all-in-one portable SDR combining HackRF-class wideband RF (≈1 MHz–6 GHz) with integrated PortaPack Mayhem firmware and battery operation. A handheld spectrum analyzer, receiver, and signal tool for RF exploration, field testing, and wireless research.
PhaseLatch Mini is a compact STM32-based SDR digitizer with dual 12-bit simultaneous ADCs and 210 kS/s USB I/Q streaming. Designed for use with PhaseLoom front-ends, it delivers clean HF/VHF signal capture for GNU Radio, GQRX, and SDR experimentation.
Mosquito TRX is a single-MOSFET 40 m CW transceiver for 7030 kHz using crystal control and direct-conversion reception — an ultra-simple QRP rig and SDR front-end for sound-card radios