Have a look at Paul Wade W1GHZ's site, here is a link to the Transverters page: ?
Paul is a former MSC co-worker and technically and practically very astute and very much into helping other hams.? I learned a lot of solid, practical stuff from him early in my career.
His QST columns and other writings are worthwhile reading.
RF/microwave MMICs really revolutionized the technology of transverter-making, with their stable, predictable properties.?
Paul's innovative PCB filter designs and plumbing fitting filter realizations are another key to consistent results.
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P.S.? I just read that one of the 10GHz MMICs which were frequently used in his designs has gone EOL.? Hopefully a suitable replacement can be found.
Good luck and 73, Don N2VGU
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Donald S Brant Jr