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Sigh.... I tried to uninstall and reinstall it sven different ways to sunday but no luck. The reply I keep getting is the driver I have is the best.

I not see big difference in speed for fixed PLL or fixed div mode. But for NanoVNA faster fixed PLL mode: - in this mode possible use one PLL for generate freq and freq + offset and second PLL for

Thanks for posting the two images. If I understand the Si5351A clock generator, there could be two different cases. In the case of no change in PLL frequency, only the Multisynth Divider would be used

The SMA jack cal kit and test connector shown by Roger is going to be much better than the other jigs IMO. If anyone does want to make one I'd recommend trying to buy the connectors as branded parts

Yes using more than one resistor for the load gives better results. I got the idea for doing this from an article posted online. He shows performance with SMA male and female parts.

Albert, The benefit is simply that one can easily and quickly clamp components of vastly different sizes to it. And the downside is that measurement accuracy is worsened by the uncertainty of where

I have made such standards in the past and have found that using 3 x 150Ω or 4 x 200Ω resistors makes a significantly-better load that a single 49.9Ω one, likely due to paralleling the resistors'

This is a reply to all of the respondents: I learn all the time from from posts like these. The interactions of these most learned of people always amaze me and is reminiscent of the nearly 40 years I

This is another method I use to test components when I am interested in higher frequencies and/or improved accuracy. It gives a better reference plane than the SMA pin jack method and is also useful

In my case I had to actually go to the mentioned folder and install the "STM device in DFU mode" as it did not appear as one of the choices of available drivers. Hope it works for you...let us know.

That is a good suggestion. There is always room for improvement. Roger

That's what I needed. I will give that a try when I get home tonight. Thanks, Dave!

I had the same or similar problem last week when upgrading my H4.? It was a driver problem. Windows kept loading the STM32 Bootloader driver and I needed the "STM device in DFU mode" driver ......I

Correct. The snag is its not recognizing it or populating in the DFU tool. -- *Andy Sayler, Head Monkey | Keyed Up/Oil Can Garage.* Down The Street | Lynden, WA 98264 | mobile (360) 319-7417

Hello Andy! NanoVNA-H4 in DFU mode has BLACK screen, not milk white on NanoVNA-H. Vladimir

Good Morning, I didn't make any driver change after having a success story updating my H model. When I plug in the H4 and hold the button down and power on to DFU mode it still is not recognized.

One thing that not all the software supports, but one can tinker a bit with scikit-rf and achieve, is that you

The leads on the SMD plugins could be cut down to where the diameter gets bigger and the leads on the SMA jack and the socket could be cut back as well. This would decrease the inductance of the

I agree, a lot of that will "calibrate out" if you calibrate "at the jig". The key would be keeping leads in the same position they were in when you calibrated.

I have one of the LibreVNA units and it is working satisfactorily for me, but the provided calibration standards and/or their definitions, provided by Kurt Poulsen, only work up to about 3.8GHz; the