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 and Hardrock-50+ power amplifiers.

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.

The ATU now includes wound toroids already installed on the PCB.

Get ready to build...