- 160-METER T MATCH ANTENNA TUNER, Design for use on the 160-meter (1800- to -2000-kHz) amateur radio band. The tuner is designed to properly load the 75 Ohm output of a transmitter into the 52 Ohm load presented by a base-loaded vertical antenna for 160 meters. (From Contemporary Electronics Circuit Deskbook - Harry L.Helms).
Contemporary Electronics Circuit Deskbook from Harry L. Helms lots of useful Circuit Application notes for your experiments and projects, you can have it from Amazon books.
- Antenna Tuner Tips, Antenna Tuner Design and Practice.