Anritsu also makes an NA that covers up to 110 GHz for about 20% less money. Note that both the Anristsu and HP N5250A are not power levelled like the soon to be discontinued 8510XF. I am seriously considering getting the XF because of that. One problem that I have seen from all
these NAs is that there can be a phase glitch as the NA switches bands internally from coax to wr10 at around 65 GHz.
If $366k is too much, consider buying Oleson waveguide heads and retrofitting an existing 8510. That is also the only way to go past 110 GHz right now. You need two synthesizers though, so it is still over $100k.
Also, any existing software written for the 8510 won't work for the PNA series. That's another nightmare I see looming.
Anritsu also makes an NA that covers up to 110 GHz for about 20% less money. Note that both the Anristsu and HP N5250A are not power levelled like the soon to be discontinued 8510XF. I am seriously considering getting the XF because of that. One problem that I have seen from all
these NAs is that there can be a phase glitch as the NA switches bands internally from coax to wr10 at around 65 GHz.