Hardrock-50 Automatic Antenna Tuner Resource Page

Welcome HR50 ATU Builders!

The Hardrock-50 Antenna Tuning Unit is a wide-range ATU that fit's inside the Hardrock-50 power amplifier.

Buy one here.

This page is where we will host all of the things you need to build the internal ATU for the Hardrock-50 Amplifier.

Look on the Files page for the assembly manual, schematic, firmware for the ATU.

Prewound Toroids are now available from The Toroid Guy. An order form is on the files page.

Get ready to build...