Just wrote a short Force 12 Blog post on this http://www.force12inc.com/pages/blog.htmlleo-bodnar-electronics-gpslocked-precision-frequency-reference-w0lfa-rbn-node/ Disclosure: Force 12 is a dealer for the Bodnar GPS Clock and I work at Force 12. 73 Bill AA7XT BIll AA7XT Glade Park CO DM59pa