Desolving something can be pretty tricky depending on whether you use a closed-form solution... Sorry, obscure math witticism... 73, Ward N0AX -- 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