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A NanoVNA was given to me by a friend... it's the coolest gadget that I'm still learning the power of. I'm weighing the purchase of a TruSDX transceiver kit, and it would come in handy for verifying the setup of the band pass filters, and getting the antenna tuned.

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Could you please elaborate on what it is useful for?

A VNA is a vector network analyzer, a device which can make fairly precise measurements of radio frequency electronics networks. These devices used to sell for $10,000 and up, recently someone figured out how to make a reasonably good one for hobby use, and they can be had for $100 or less.

You can use them to test antennas, tune filters, find the frequency of crystals, and other things.

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