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I think you'll find this website interesting http://www.qsl.net/om3cph/dds/wobbler.html

I have a setup like this using an AD8310 ( http://www.qsl.net/om3cph/dds/ok1uts/detector/detector.html ) which outputs an accurate db signal level scale on a scope. It's great for designing and aligning all sorts of RF filters or equipment testing. Making this work with your setup should mostly be hardware and the AD8310 (and 8307) are very easy to use 8 pin IC's