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Thanks for all the information and suggestions. I will chose a low cost option and have learned to be more thoughtful and careful with this wonderful tool. I have learned a lot from it and have a

It was the H4 . Purchased from R&L. I accept the blame for the damage. The nano was not defective.

Here's an example of what the Y21 method can do. The plots are for an ATC 2.7 pF capacitor. The VNA was an HP 8722D with Inter-Continental test fixture and calibration kit. Self-resonance is about 9.4

There is also a large family of low-capacitance limiter diodes from a number of (non-Chinese) sources designed specifically for the purpose if you choose to build your own. They are readily available

As Dave mentioned limiters like mini-circuits VLM-33W-2W-S+ are a good solution. Unfortunately these are hard to get as they are being re-designed, and ebay sellers know this and have jacked up prices

Got it wrking now. It was a cable. I tried 4 till I got it wrk. And still only one firmware worked on it also

QUOTE: Good overview. I think it is worth to add a little bit more to point 2 of the recommendations. Because in case one is measuring a reactive component at a frequency range of interest, which

That would be fine. I think some of the L & C vendors that offer Touchstone files generate them from simulations, not from raw VNA data. I don't think they're trying to hide any issues with their

Understood Brian. You (I) can turn intepolation off. In any case, I suspect these measurements were done with TRL calibration on microstrip, TRL cal does have bandwidth constraints and perhaps is the

Which VNA. Some early versions on nanoVNA has spikes when switching from fundamental to harmonic mode. The fix was to lower transition frequency. Some other versions could not handle the high

Ted, See Msg. #38300. I thot I'd messed mine up trying to upgrade the f/w by the DFU mode, but Stan talked me thru it, and now it works fine. There's a lot of good help here. jbl

Permanent installation of the following would go a long ways in protecting the S11 or source port: VLM-33W-2W-S+ From Minicircuits. It's presently under re-design, but is available and is designed to

Alan, I want the program to show what's in a file, not a sanitized version. Note that cubic spline interpolation, the kind of spline I'm familiar with, can yield points well away from a reasonable

Sorry for the bandwidth. Brian, two simulators failed to read the Johanson file correctly. However, a Keysight simulator had no issue. Operated fine. Here is s11,s22, and 20000 data points and of

Which one? NanoVNA V2 frontend is quite different from H4 (for example). [email protected]> wrote:

Terry, Can you please explain the RF exposure or ESD which caused the failure so that I can take precautions? 73 Jon, VU2JO [email protected]> wrote:

Sad to report that, for the second time, my nanovna is broke from RF over exposure or ESD. My question is: can I protect the input with some fuse- or similar over-load protection device? Yes, I will

Use a different USB controller on your computer and check the USB cable. [email protected]> wrote:

It connects, firm ware is the latest for the H model, i fellow the steps in the guide, the dfu demo software starts as normal starting delete phase, takes 18 hrs, now im in down load phase and its 4

Dave, Good overview. I think it is worth to add a little bit more to point 2 of the recommendations. Because in case one is measuring a reactive component at a frequency range of interest, which