On Mon, 2010-09-20 at 01:13 -0400, Dennis Berry wrote: > Do a google search and you'll find a few designs. One was the accuprobe, http://www.k8dd.com/files/ARCI/2007/FDIM_2007_Proceedings-WB8RCR.pdf Take a look at pp 57-58. Not a lot of detail there, but I'm sure Earl would be happy to share them. 73 de WB8RCR