Several years ago I purchased a Copper Mountain R60 for the company I was working for to test antenna assemblies in production. My past experience had mainly been with HP boxes (HP8753, 5071), and I was pleased with the R60. When at that company, I had a FieldFox for a VNA at my bench. With the HP VNAs, I didn't have the TDR option, so I had to do my own math for that function. For antenna assembly testing (connector, cable, antenna), I needed to have a TDR function to find issues with manufacturing. The R60 software threw in the TDR option as free, so that was a real bonus. In fact, you can download their software, use whatever VNA you have, save in Touchstone, and read the files in and convert to time. Just make sure you do the sweep correctly (evenly spaced points from 0) because the software doesn't check that and you'll get bad results (at least it did this 7 or so years ago). I wouldn't hesitate to consider Copper Mountain again.
In my case, my Agilent VNA is quite old now. It's running Win 2k. There will be ways to network it to my main Win 11 PC but I don't want to do it for various reasons including security.
I'm going to keep doing things the way I always have done with this old VNA. I'll just keep on trotting back and forth from PC to VNA, slowly wearing out the carpet
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I completely don't understand this. Whatever VNA I use, I always read the data into a PC, usually using VISA/SCPI (GPIB, Ethernet, Whatever interface the device has). I never use sneakernet; I don't understand why anyone does. If you have a virus issue on your Windows based VNA, plug in a USB flash drive, and sneakernet to a PC, you can also transfer problems that way. If I connect GPIB or Ethernet and get my data via SCPI, how is that a security issue? If you connect with Ethernet, Firewalls work. I have a specific subnet which I only use for instrument control. I don't try the do the log into the instrument from the other side of the world thing. If I need to work remotely, I'll remote into my lab computer, and run my automation programs.
Copper Mountain is completely different in that you run their application and communicate with that to get the data.