Fortunately, dual-purpose analyzers that combine spectrum analysis and VNA are available now, which are designed with a mix ...

Unfortunately, typical modern spectrum analyzers have a capture bandwidth of 10 MHz, or with options, up to 40, 80, or sometimes 160 MHz. But this is nowhere near the 1- to 3-GHz capture bandwidth on ...

Shown is a block diagram of a state-of-the-art receiver or spectrum analyzer that incorporates a digital IF stage. (Image from Reference 1) ...

A spectrum analyzer can EASILY provide 90dB of dynamic range, if not more. So, this is the big difference between an oscilloscope running an FFT and spectrum analyzer: Dynamic range.