You might as well upload to both unless someone complains :)
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Another option for a sweeper is the synthesised HP 83752A from the 1990s. These only cover up to 20 GHz but they can be found for sensible money sometimes. I've got one here and the internal levelling is remarkably good up to 20 GHz. Much better than the datasheet.
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Many years ago I used it to check my HP 8566B analyser using external levelling up to about 10 GHz using a resistive splitter and I did the external levelling with a power meter. I found that the HP 8566B was much flatter than the spec. It was remarkably good from about 40 MHz to 2 GHz on the first range. Above 10 GHz I just connected the 83752A to the input of the 8566B using a really short Gore cable (after checking it with a power meter) and this gave good results to about 15 GHz. Again, much better than the spec limits. I didn't bother checking it above 15 GHz. This was quite a few years ago though. I stopped using the 8566B about 6/7 years ago after upgrading to something a bit more modern. Otherwise I would have checked it more recently.?
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It's easy to get in a muddle with the Yig preselector tuning feature on the 8566B and this can mess up the flatness. I found I got the best results with the factory default settings. Whoever used the analyser before me (I purchased it as an ex-rental from Microlease in about 2010) had really messed up the Yig tuning using the front panel buttons and this had put some deep dips in the frequency response. Fortunately, the factory default settings proved to be very good once I reset it.
