On Sun, Sep 18, 2011 at 10:25 AM, <k2zf50 at aol.com> wrote: > ... it happens only on 20 meters into a dummy load... ============= Maybe you can put a scope across the dummy load and calibrate your power output that way. That has worked for me. Tony KT0NY -- http://www.isb.edu/faculty/facultydir.aspx?ddlFaculty=352