I am looking into experimenting with spectrum analyzers that can do at least upto 2.9Ghz.
I thought higher the model number the higher the GHz, but I now see they are generation based too.
Here are the 8560 series. What hardware boards/sections do they share? Maybe not all models but some of them perhaps.
8560E 30 Hz - 2.9 GHz
8561E 30 Hz - 6.5 GHz
8562E 30 Hz - 13.2 GHz
8563E 30 Hz - 26.5 GHz
8564E 30 Hz - 40 GHz
8565E 30 Hz - 50 GHz