UHF Amplifier Designs for Amateur Radio Operators
Find schematics and construction projects for UHF amplifiers to enhance signal strength across various bands.
Building UHF amplifiers is a popular homebrew activity for hams looking to boost their signal on bands like 70cm (432 MHz), 23cm (1296 MHz), and even higher frequencies up to 10 GHz and 24 GHz. These projects allow operators to achieve higher power output for DX, EME (Earth-Moon-Earth) contacts, or ATV (Amateur Television) operations, significantly extending their station's reach. Many designs focus on solid-state devices, often repurposing commercial modules or using specific RF transistors.
Operators can find detailed construction guides for various power levels, from 1-watt designs suitable for portable use to high-power amplifiers exceeding 300 watts. Resources often include schematics, PCB layouts, and component lists, sometimes featuring specific parts like the Motorola MRF646 or Mitsubishi RA18H1213G transistors. These projects cover a range of UHF bands, providing practical solutions for hams to build their own power amplifiers for improved QSOs.
-
1 watt amplifier for 10 ghz made from surplus stuff -
The 23 cm amplifier pictured here delivers more than 300 watts with 10 watts drive. -
432 MHz EME low noise amplifier. Circuit, components and image by Christoph Petermann DF9CY -
OZ2OE Technical Home Page - 432 MHz PA with 8874 -
A detailed DIY project for constructing a 1500-watt RF amplifier specifically designed for the 70cm amateur radio band, utilizing a GS-23b / 4CX1600U Svetlana t -
Two coupled PAs with each 2 times 2C39 deliver around 400W RF. -
1296MHz M57762 * 16 Power AMP 16V 100A 1.6KW Input -
This page details my building of a 100 Watt Power Amplifier for the 432 MHz Band based on two Motorola MRF646 transistors taking inspiration by Carlo Gnaccarini VK3PY, formerly VK3BRZ -
This amplifier uses two 60w Spectrian amplifier boards with the usual input and output hybrid coupler and combiner. -
A home made project for an ATV RF power amplifier -
A 200 Watt amplifier for 23 cm band -
23 cm PA with Mitsubishi RA18H1213G -
This amplifier takes advantage of the proliferation of surplus cellular 26v RF boards -
A detailed construction guide for a 500W 70cm solid-state amplifier, featuring design modifications and performance enhancements for the Freescale -
1KW 70cm LDMOS amplifier project -
Bi-Directional 2.4 GHz One Watt Amplifier With Receive Pre-Amplifier. This will show you how to add a bi-directional, 2.4 GHz amplifier to your Proxim Symphony for under $100 -
This will show you how to add a RF power amplifier to your Proxim Symphony for under $50. The cost is reduced by using the existing components on the Symphony, such as the PIN diode switch, and just inserting a higher power final amplifier. Increase the RF output power of your wireless network card to 1 Watt.