The R&S FSU67 is claimed to be the first spectrum analyser covering 20 Hz to 67 GHz in one full span sweep with one coaxial input.
The instrument makes measurements above 50 GHz up to 67 GHz now very easy. There is no cumbersome and difficult to use set-up with external harmonic mixers.
Features include: no image response and multiple responses as with external harmonic mixers, therefore unambiguous frequency indication without the need for signal identification; simplified test set-ups with just one connection from 20 Hz to 67 GHz; full span sweep of 67 GHz; wider level range with a much higher allowable reference level than with harmonic mixers; good level accuracy up to 67 GHz; an RF attenuator with a range of 0 to 70 dB is already included.