:)You can download manual here , mic. wiring is on page 5.http://www.iw2nmx.it/Yaesu/FT-290R/FT-290R%20Instruction%20and%20Service%20Manual.pdfThe YM-38 must be re wired to suit.If the YM-38 is wired for a standard Yeasu Transciever, you simply make note of what color or braid is on what pin, compare to standard mic. wiring diagram.Then using this info, rewire for FT-290r.If YM-38 is not wired to a standard format, then the multimeter will soon tell you which wire does what,73 de WilliamZS4L / ZS5WC