Why not do this... Should be cheaper and offer better performance.. Especially short tem. http://www.jrmiller.demon.co.uk/projects/ministd/manual.pdf Doc KX0O Sent from my iPad On Apr 14, 2012, at 8:11 PM, time-nuts-request at febo.com wrote: > Opinion Of Attached - Possible HPSDR GPSDO > 'Engine