Hello All, Mea maxima culpa! In extracting the Ham Radio article I left out a page. Mark Dinsmore has posted the complete article on his site here: http://nz7x.com/articles/HR-Feb-73-p8-18-rcvr%20design.pdf Sorry about that---boy am I ever! Brian --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com