Hello All, I designed a simple optocoupled isolator for connecting the CAT interface of our Yaesu FT1000MP MK5 to a PC. The optocoupling avoids electrical and RF problems that you can have with a simple RS232C cable (especially in a contest environment...). If anyone is interested, go to http://www.hamlan.org/tech/tech.htm Ciao and 73 Guido, ik2bcp / iu2r / ab9dg