Fixing a Chinese "QRP Manual Days" Antenna Tuner Kit

Presented at 9/7/2021 meeting of the River City Amateur Radio Communications Society, Sacramento, California. Fixes for the Chinese "Zerone 1-30 MHz Manual Antenna Tuner kit."
00:00 Introduction
01:20 Comparison of QRP Tuners and Kits
04:03 The Zerone "Manual Days" Tuner Specifications and Reviews
05:20 The Kit Parts
06:45 The Circuit Description
10:10 Correcting Errata and Other Issues
15:35 The Project Build
17:05 NanoVNA Testing and Results
19:50 Conclusion
20:55 Discussion
The kit requires drilling the enclosure, soldering components on a PC board and winding a 36 turn toroid inductor with 12 taps.
The English kit instructions are very poorly translated from Chinese with errors. In this video I describe several changes that yield a working unit.
Still photos are posted at https://photos.app.goo.gl/zY3cQaQDLFs2QU7U8
Manufacturer's specifications: 1-30 MHz, 15W maximum power, impedance matching range 40-300 ohms.

Видео Fixing a Chinese "QRP Manual Days" Antenna Tuner Kit канала KP4MD