Oops. I had the filter bandwidth at 12 not 13. That did the trick! Thanks! One other thing, why can't you use the dsp to get down to 6Khz for AM? -- View this message in context: http://elecraft.365791.n2.nabble.com/ErrTXF-using-FM-on-10m-tp7571521p7571535.html Sent from the Elecraft mailing list archive at Nabble.com.