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 is now supplied fully assembled including wound toroids already installed on the PCB.

All you need to do is install it in your amp.

Use the Insallation Manual on the Files page