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.

The ATU is now supplies fully assembled including wound toroids already installed on the PCB.

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