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DIY Antennas, QRP, SDR & Ham Radio Projects from VU3DXR

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SDR

The SDR section focuses on Software Defined Radio hardware, firmware, and real‑world operating techniques. Here you’ll see coverage of Linux‑based SDR transceivers like sBitx and ZBitx, handheld SDR projects, ADS‑B and flight tracking setups, Mini Radio / ATS‑Mini firmware updates, and practical guides to HF digital reception such as WEFAX and FT2

ATS-20 Radio receiver after firmware update
Articles Guide radio Reviews SDR

ATS20 Radio Receiver: Comprehensive Review – Small Package & Big Performance

June 27, 2025February 19, 2026PrabakaranComment(1)

ATS-20 is a compact SI4732-based multiband DSP receiver covering FM, MW, SW, and SSB — a highly sensitive portable radio with external antenna support and mod-friendly firmware

LILYGO T-Embed SI4732 DSP radio receiver
Articles Guide News radio Reviews SDR

Exploring the LILYGO T-Embed SI4732 Radio Receiver

June 24, 2025March 25, 2026PrabakaranComment(0)

LILYGO T-Embed SI4732 combines an ESP32-S3 microcontroller with a DSP multiband radio (AM/FM/SW/LW + SSB), IPS display, and wireless connectivity — a compact programmable receiver for makers and radio enthusiasts.

MSI SDR panadapter dongle
Articles News radio Reviews SDR

Exploring the MSI.SDR: A Low-Cost Gateway into Software Defined Radio

June 20, 2025April 20, 2026PrabakaranComment(0)

Explore MSI-SDR — a budget wideband SDR receiver with 12-bit ADC, up to 8 MHz bandwidth, and multi-band inputs, offering hobbyists a cheap entry into RF spectrum analysis

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DIY Antenna

  • FM Loop Antenna
  • COCO Antenna (VHF)
  • FBK Sleeve Antenna (VHF/UHF)
  • Shortened G5RV Antenna (HF)
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  • Shortened EFHW (40-10M)
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  • GM4JMU Shortened Dipole (HF)
  • Delta Loop VHF Antenna
  • Aperiodic Multiband Wire Antenna
  • Capacitor Loaded Shortened Dipole Antenna
  • HF Delta Loop Antenna
  • ZED Dipole Antenna (VHF)
  • Loaded Loop Antenna (HF)
  • Sleeve Dipole Antenna (VHF)
  • Twin Delta Loop Antenna
  • Broadband VHF Antenna
  • Shortened Inverted V antenna (HF)
  • Multiband G5RV Antenna

2M Antenna (13) Amateur Radio Projects (20) AM HF Transmitter (14) Antenna Projects (89) Audio Compressor (22) circuits (22) Compact Antennas (12) CW (16) digital modes (15) DIY electronics (17) DIY radio (12) ESP32 DSP Radio (21) HF wire antenna (19) Loop antenna (12) Microphone Preamplifier (13) Mike Compressor (18) QRP (13) radio (21) Software Defined Radio (26) transmitter (33) VHF/UHF Antenna (24)

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  • Radio Waves Weekly — Issue #013
  • The New Digital Frontier: Meshtastic vs MeshCore for HAM radio
  • The Silent Revolution: DRM+ Radio in the FM Bands
  • Meshcore for Ham Radio: A Simple Start
  • The Ultimate Guide to HF Digital Dominance: FT8 vs FT4 vs FT2
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