OK Press, pretty good explanation. Now all we need is the dialectric constant, and we can figure out for ourselves the impedence of the line. Thanks Ed -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contesting.com Problems: owner-towertalk@contesting.com Search: http://www.contesting.com/km9p/search.htm