Hello Tom, One of my elmers tried setting something similar up for WSPR but even with adding the various filters, the harmonics on the higher frequencies were very significant and went well out of the HAM bands! http://rockingdlabs.dunmire.org/home/first24hrswithraspberrypiandwspr Still, the Rpi a pretty fun toy especially when you add in a TNC-Pi for packet! --David KI6ZHD