Twin-Lead J-Pole Antenna for VHF and UHF Amateur Radio

Want a simple, low-cost antenna that actually performs well on VHF/UHF? The twin-lead J-pole might be exactly what you need.

Built from basic 300-ohm twin-lead, this classic design combines a half-wave radiator with a quarter-wave matching section, giving you efficient performance without radials or complicated tuning networks.

Why it’s so popular among ham operators:
• Easy to build with minimal materials
• Naturally omnidirectional—great for repeaters and local contacts
• Adjustable feed point for low SWR without extra components
• Lightweight and portable—perfect for field setups or emergency kits

Whether you're experimenting with antennas or need a reliable backup for your station, this design delivers solid performance for its simplicity.

Check out the full build guide and dimensions here:
🔗 https://vu3dxr.in/twin-lead-j-pole-antenna-for-vhf-and-uhf-amateur-radio/

Full Wave Loop Antenna for VHF UHF FM Radio Bands

Looking to upgrade your VHF/UHF setup without complicated gear? Try building a full-wave loop antenna.

This design uses a loop with a perimeter equal to one wavelength, giving you better efficiency and a more balanced radiation pattern compared to basic antennas.

Why hams love it:
• Lower noise pickup (great for cleaner signals)
• Around 2 dB gain over a dipole
• Works across VHF, UHF, and even FM bands with simple scaling

It’s compact, easy to build, and surprisingly effective for both transmitting and receiving.

If you enjoy DIY radio projects, this guide walks you through dimensions and construction step by step:

🔗 https://vu3dxr.in/full-wave-loop-antenna-for-vhf-uhf-fm-radio-bands/

The zBitx v2 Migration: Community Fixes for v1 Hardware Owners

The zBitx v2 Migration: Community Fixes for v1 Hardware Owners: zBitx v2 Migration. Learn how to fix common white screen bug, calibrate your touchscreen, and ensure your Pico W is ready for the new Wi-Fi architecture

Simple CW 74HC240 Transmitter using buffer IC

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The zBitx v2 Has Arrived: Efficiency, Built-in EFHW, and a Wi-Fi Revolution

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Khanfar Spectrum Analyzer: A Free RTL-SDR Tool Suite Worth Knowing

Khanfar Spectrum Analyzer: A Free RTL-SDR Tool Suite Worth Knowing: A detailed look at the Khanfar Spectrum Analyzer free RTL-SDR tools covering real-time FFT, wideband scanning, CFAR , IQ recording, and radio direction finding

Build a Simple FM Band Transmitter Circuit

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.

Want to build an FM transmitter from scratch? 🎙️📡

This simple circuit uses a single 2N2222A transistor and a 9V battery to create a functional FM band broadcaster. A great weekend project for learning about tank circuits and frequency modulation!

Schematic and build guide: https://vu3dxr.in/build-a-simple-fm-band-transmitter-circuit/

Mini FM Radio Transmitter

Mini FM Radio Transmitter: FM Radio Transmitter takes your voice from a microphone and turns it into a r signal. Then, this radio signal can be picked up by any standard FM radio nearby.

Build your own tiny radio station! 🎙️📡

This Mini FM Radio Transmitter circuit is a great way to learn about oscillators, tank circuits, and RF modulation. Simple components, 9V powered, and easy to tune.

Details and schematic here: https://vu3dxr.in/mini-fm-radio-transmitter/

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

DIY Moxon Rectangle Beam Antenna for 10m, 15m, and 20m Bands: Master the DIY Moxon Rectangle Beam antenna. Detailed guide on dimensions, design, and calculations for 14MHz, 21MHz, and 28MHz ham radio bands.

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

If you’ve been hearing the buzz about Meshtastic but aren't sure how it fits into the Amateur Radio world, this comprehensive guide from VU3DXR is a must-read.

While some dismiss it as just for "preppers," hams worldwide are leveraging LoRa (Long Range) technology to build self-healing, infrastructure-independent mesh networks.

What’s inside the guide: ✅ The Tech: How LoRa achieves incredible range below the noise floor. ✅ The Hardware: A look at the T-Beam, Heltec, and RAK WisBlock. ✅ Meshtastic vs. APRS: Why Meshtastic is winning in areas with low infrastructure (like India). ✅ Ham Compliance: How to stay legal (callsign ID, disabling encryption, and frequency selection).

Whether you're in a disaster-prone area or just love experimenting with digital modes, it's time to see what LoRa can do for your shack.

📖 Read the full guide here: https://vu3dxr.in/meshtastic-ham-radio-guide-lora-mesh-networking-for-hams/

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

Low Height Loop Antenna : A 40-6 Meter Powerhouse for Modern Hams

Low Height Loop Antenna : A 40-6 Meter Powerhouse for Modern Hams: Boost HF performance with the Low Height Loop Antenna. Cover 40m–6m using 4m masts and a symmetrical ATU. Ideal for quiet reception and multi-band versatility.

Complete Guide to Budget Software Defined Radio : From $15 Dongles to Serious HF Receivers

Complete Guide to Budget Software Defined Radio : From $15 Dongles to Serious HF Receivers: New to software defined radio? This complete guide compares the best affordable SDRs, explains what to buy first, and shows you what you can do with one

VHF DXing Secrets: The Ultimate Guide to Tropospheric Ducting for Radio Hams

VHF DXing Secrets: The Ultimate Guide to Tropospheric Ducting for Radio Hams: Discover secrets of tropospheric ducting for VHF DXing. This guide covers temperature inversions, weather maps strategies to master long-distance propagation.

Master Ham Radio Guides & Tutorials

Master Ham Radio Guides & Tutorials: This page brings together in‑depth Ham Radio guides, tutorials, and how‑to articles from DXR Electronics Bits—covering SDR, DRM, propagation, digital modes,