Monday, January 19, 2026

Build a Powerful FM Radio Bug Transmitter

Build a Powerful FM Radio Bug Transmitter: guide on building a high-performance FM radio bug transmitter using BC547 and 2N3563 transistors. Explore RF electronics with this powerful 100MHz DIY project.

For electronics hobbyists, few projects are as rewarding as mastering Radio Frequency (RF) design. This Powerful FM Radio Bug Transmitter is a classic, high-performance circuit that offers a significant step up from basic single-transistor designs. Operating on the 100 MHz FM band, it provides a robust and clear signal suitable for various wireless audio applications.

Monday, December 29, 2025

9:1 UN-UN Long Wire Transformer for HF Antennas

9:1 UN-UN Long Wire Transformer for HF Antennas: A detailed guide to the 9:1 UN-UN long wire transformer, explaining its design, connections, grounding, and HF antenna performance.

Without a 9:1 Unun, your long wire is just a piece of metal making your tuner work too hard.

Check out this guide by VU3DXR to see: ✅ How a 3:1 turns ratio = 9:1 impedance jump. ✅ Why wire length actually matters. ✅ How to build one for under $20.

Perfect for your next field day or emergency kit! 🎒

Read more: https://vu3dxr.in/91-un-un-long-wire-transformer-for-hf-antennas/

Friday, December 26, 2025

FM Bazooka Antenna for Superior FM Radio Reception (88–108 MHz)

FM Bazooka Antenna for Superior FM Radio Reception (88–108 MHz): FM Bazooka antenna for 88–108 MHz offers low noise, wide bandwidth, and excellent FM DX reception using simple coaxial construction.FM radio antenna

Slim-Jim Antenna for FM Broadcast Band reception (88–108 MHz)

Maximize your FM radio signal with the power of a Slim Jim Antenna! 📡🎶

If you are looking for a high-performance, budget-friendly DIY project to improve your 88–108 MHz reception or broadcast range, the Slim Jim is a game-changer. Unlike standard dipoles, this end-fed folded dipole offers a lower angle of radiation, directing more energy toward the horizon where you actually need it.

Why choose the Slim Jim?

  • High Gain: Significant improvement over a standard ground plane antenna.

  • Low Noise: Integrated matching section helps reduce man-made interference for a cleaner signal.

  • Weatherproof & Portable: Easily house your build in a PVC pipe to protect it from the elements.

  • Custom Tunable: Precision measurements for 88, 92, 96, 100, 104, and 108 MHz.

Whether you are a DXer trying to catch distant stations or a local broadcaster optimizing your setup, this guide provides the exact dimensions and wiring steps to get the job done. 🛠️📻

Check out the full technical breakdown, wiring diagrams, and frequency charts here: 👉 https://vu3dxr.in/slim-jim-antenna-for-fm-broadcast-band-reception-88-108-mhz/

#FMRadio #SlimJimAntenna #HamRadio #DIYAntenna #RadioBroadcasting #VU3DXR #AntennaDesign #TechDIY