Yaesu FC-50 Automatic Antenna Tuner For FT-891 / 857 / 897 Series 100ch memory
FC-50 is compatible with all FT847/FT100/FT100D/FT897/FT897D/FT857/FT857D series. 50 MHz to 54 MHz: 25 Ω to 100 Ω. Matching range impedance 1.8MHz to 29.7MHz: 16 Ω to 150 Ω. Input impedance 50 Ω.