OK. Here is the first photo of the successful accomplishment of my goal. The photo is a bit out-of-focus, the trace is not focussed well, etc. but it gives a pretty good idea of what is going on. http://www.w7ekb.com/Personal/BC454/BC454IF-2.jpg See the sweep retrace? Pretty crappy, huh? Suggestions? Comments? Ideas? Ken W7EKB