Phil Duff <na4m@arrl.net> wrote > It's possible these things meet FCC specs but can still generate enough > noise to cause interference in closeby sensitive HF radios? Yup! And a LOT of things do not meet the standard they are marked as meeting. If they're marked at all. Check out http://www.apogeeddx.com/EMI_considerations_using_DDX.PDF Cortland --