Fumei Duplexer Retuning 

I bought one of those cheap Chinese (U/V UHF VHF Dual Band Spectrum Analyzer Simple Spectrum Analyzer with w/Tracking Source) it does not come with manual and very little to find on the internet on it, your video helped me a lot to understand what is what although its not the same equipment. Thanks for the nice video :-)

Outstanding! Well done.

Who'd have thought I'd become a purist amongst HP snobs :P A VNA is nice; but, a service monitor is WAY quicker!

Did the w shape of the other set of filters tune out when you swapped back and checked them again?