World's smallest QRP Automatic Antenna Tuner (KT-005) from KRAIT Technologies

Example of using KT-005 ATU with QCX-mini transceiver. The video shows switching on the ATU with Pi power measurement, then tuning step. A moment later, after the characteristic sound of switching relays, you can see SWR ratio of 1:1.5 (or lower) and again Pi power measurement. The video was recorded using AMPRO-20 antenna. The QCX-mini and ATU were powered by 8 x 1.2 V AA batteries.
More information you can find on:
www.krait-technologies.com