Building a Simple 2N2222 DSB Transmitter for Amateur Radio

Minimalist RF circuits often teach more than complex modern designs. This small DSB transmitter is a good example. The entire DSB transmitter uses only one active semiconductor device together with a pair of diodes and a few tuned circuits.

At first glance the circuit almost looks too simple to work seriously. Yet it does. When connected to a properly matched antenna, the transmitter can establish contacts with ordinary SSB stations surprisingly well. Most operators on the other end will hardly notice that the signal comes from such a basic setup because the carrier is largely suppressed.

The original concept was published by the well-known experimenter JF1OZL and later reproduced by several European homebrew enthusiasts. Its appeal comes from one thing: simplicity.

Building a Simple 2N2222 DSB Transmitter for Amateur Radio

ATS Mini Firmware Now Supports LILYGO T-Embed SI4732

ATS Mini Firmware Now Supports LILYGO T-Embed SI4732: ATS Mini firmware v2.34 now includes experimental support for the LILYGO T-Embed SI4732 receiver. Here is what the hardware does, how ATS Mini firmware works,

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/

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

Ever heard signals travel hundreds or even thousands of kilometers beyond line-of-sight? That’s not magic—it’s tropospheric ducting.

This fascinating radio phenomenon happens when atmospheric conditions (like temperature inversions and high-pressure systems) bend and trap VHF/UHF signals, letting them travel far beyond their normal range.

For ham radio operators, this means unexpected DX contacts, strong distant signals, and sometimes even interference from stations you’d never normally hear.

If you’re into radio, propagation, or just curious how the atmosphere can act like a giant waveguide, this guide is worth your time:

🔗 https://vu3dxr.in/ultimate-guide-to-tropospheric-ducting-for-radio-hams/