microHAM USB Interfaces have built-in hardware support for your radio - you no longer need additional level converters like CT-62, IF-232, FIF-232, CT-17. USB Interface III includes support for CW keying (DTR) and PTT (RTS) as well as a detector/driver for pseudo-FSK and QSK CW on the soundcard's right audio channel for use with FLDIGI on any platform. PTT IN cable for Yaesu transceivers with mini DIN 8 CAT, Tuner, Linear, or Band Data jacks. PTT IN & Inhibit only: FT-450, FT-840, FT-847, FT-890, FT-900, FT-950. ft-950.