Nice video, thanks!
I never liked the Anritsu VNAs though. The HPs just seemed to stay in cal longer. Inconvenient with mechanical cal kits and a chore.
I'm sure it must have been a pretty penny back in -94 to get a 20GHz unit!
I must say I enjoy your repair videos the most, it's so satisfying. Great service to the community. I always hope for an RF related problem and not some RTC or PSU triviality.
Anyway, here is my idea for a video.
Design, manufacture and verification of an impedance transformer. This is very basic stuff but a lot of the comments seem to display a lack of knowledge of what you would use a VNA for. Qucs could be used for the design as you probably want to stay with free tools.
Almost everyone knows of 50 and 75 ohm cables though and this would be an easy introduction to characteristic impedance, or as it was historically known, surge impedance. If you design for 500MHz you could possibly even demonstrate in time domain. This is something even experienced microwave designers sometimes struggle with as they are so used to frequency domain techniques. I routinely integrate an oscilloscope in my lab setup now to capture waveforms at RF frequencies. Of course this wasn't possible just a few years ago.
Just a thought since you seem to like RF equipment!
/K