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Here is how you test an antenna switch for SWR insertion, in line attenuation and isolation between ports.
The NanoVNA is a great little unit for doing so many things and not limiting yourself to just checking SWR of an antenna.
Here is a link to my last video where is show you how to set the NanoVNA up for making the above tests.
• Setting up the NanoVNA...
Barry, KU3X