Microphone Preamplifier with Diode Clipper for SSB Transceivers

Microphone Preamplifier with Diode Clipper for SSB Transceivers: Learn how to build high-performance microphone preamplifier featuring a diode clipper. This guide breaks down transistor stage and 1N914 limiting mechanism.

In the world of amateur radio (RF) and DIY audio, getting a “clean” signal is often a game of balance. You need enough gain to make your voice heard, but you must prevent over-modulation which leads to distortion. The circuit provided is a classic solution: a single-stage preamplifier coupled with a parallel diode clipper.

J-Pole Antenna Using 300 Ω TV Ribbon Line

J-Pole Antenna Using 300 Ω TV Ribbon Line: Simple 300 ohm twin-lead J-Pole antenna for 2-meter ham radio. Lightweight, no radials, easy to build, and ideal for portable, emergency, and home use.

The J-Pole antenna made from 300 Ω TV twin-lead is a simple, lightweight, and very effective antenna for VHF operation, especially for the 2-meter amateur band. With no ground radials required and an easy feed arrangement, this antenna has become popular for portable use, emergency setups, apartments, and antenna-building events. The attached diagram illustrates a proven design that has been successfully built and tested by many amateurs.

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

Twin-Lead J-Pole Antenna for VHF and UHF Amateur Radio: Twin-lead J-Pole antenna explained with construction details, dimensions, feed method, and performance for VHF and UHF amateur radio applications.

Multiband Dipole Antenna for 10–80 Meters

Multiband Dipole Antenna for 10–80 Meters: The Multiband Dipole Antenna shown in the attached diagram is a practical and space-efficient solution for amateur radio operators who want to operate on multiple HF bands using a single wire antenna. This design covers 10, 11, 15, 20, 40, and 80 meters, making it ideal for limited-space installations such as rooftops or small yards. Instead of using multiple dipoles or traps, this antenna relies on symmetrical loading coils and a matching section to achieve multiband operation.

3 x 5/8 Collinear antenna for 435 MHz UHF Band

3 x 5/8 Collinear antenna for 435 MHz UHF Band: High gain 435 MHz UHF collinear antenna design using three 5/8-wave radiators and inductive phasing. Ideal for UHF repeaters with 6 dB gain

VHF Collinear J-Pole : The DIY Super J-Pole Antenna

VHF Collinear J-Pole : The DIY Super J-Pole Antenna: Take your VHF/UHF station to the next level with DIY Super J-Pole guide. Learn how to build this collinear antenna for maximum gain and clear long communication.

If you’ve spent any time in the ham radio world, you know the standard J-Pole is a reliable “workhorse.” But what if you need more “reach” without switching to a complex directional Yagi? Enter the VHF Super J-Pole.

When it comes to omnidirectional antennas, the standard J-Pole is a legendary starter project. But for those who want to push their signal further toward the horizon, the Collinear J-Pole (often called the Super J-Pole) is the ultimate upgrade.

By stacking radiating elements and using a clever “phasing” technique, this design provides a significant gain increase over a standard dipole or J-pole, making it a favorite for builders who value efficiency and distance..