At some point someone will probably design a modern replacement for the top half of the classic old HP 8568B and 8566B spectrum analysers. It should be possible to design a decent digital IF (with IF preselection) and a really nice touch display. This would transform these old analysers, making them able to analyse modern signals and compete with modern instruments. Ideally, it would be a (plug and play) reversible modification in case anyone wants to restore one to the original state with the 85662 display section complete with CRT.
