Thanks for the keywords, I'll start googling. :-) Jinx wrote: >> I'm trying to measures RF time-of-flight up to a few mm accuracy > > Perhaps some method of phase detection could be used. I'm no > expert, maybe interferometry ? Isn't this how measurements of very > short distances are done with lasers ? -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body