Well, folks, it turns out that there was a comport issue. Changed to a different comport and now the rotor control works fine. 73, Al, K6RIM Albert C. Burnham 409 Summit Drive Corte Madera, CA 94925 Phone: (415) 924-6783 Cell: (415) 810-4839 FAX: (415) 924-6678 E-mail: k6rim@pacbell.net