If you are happy owner of YAESU FT-857D or YAESU FT-897D (like me, bought mine 857 at december 2006 from http://hamcity.com/ ), you can easily make this device, similar to LDG FT-Meter. You need only passion, time, one R, one trimer potentiometer, one analog scale with In<1mA and one 3.5'' jack. Mine is drawn with Corel DRAW. You can download FT Meter.cdr and adapt it easily for your scale.