The NanoVNA arrived the other week, these units are very good value and work remarkably well. With small size and weight (63 grams)including battery, it can easily be taken out in the field, providing it is protected from the elements. The NanoVNA is a PCB sandwich essentially, with open sides.
The first test was to sweep the filters in the compact 20 metre transceiver. The filters came out pretty well spot on.
Next test was the 3 band SOTA portable end fed half wave antenna to see if it was still in resonance after many activations over the last few years. It had been repaired a couple of times after tree snags, and maybe lost a cm or two.
The antenna was tested as a sloper in the back yard with one end supported by a 6 metre squid pole, and the feed end supported by a walking pole. It was also tested in the same configuration but using an 8 metre squid pole. The results only changed slightly, lowering the resonant frequency.
A short counterpoise was connected but this made very little difference to resonance.
The shots below have some light reflections, it would have been better to connect a PC, but convenience won.