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I think these RF test boards help, trains you on results, if you have set the vnanano up and calibrated correctly, getting the prescribed results gives us ou some confidence in the nano.

Interestingly, inside KEIL, STM32F302CB and STM32F302CC use the same memory description file. So in fact STM32F302CB and STM32F302CC may use the same Die, just marked as different models when

A cheap LCR meter is also a good option for measuring variable capacitors. The value of most types of capacitors does not vary wildly with measurement frequency. The value of inductors does, which is

I did some measurements on a variable capacitor in my junkbox. It was from an old MW receiver. I measured the closed position on a calibrated DE-5000 LCR meter and it was 367 pF. In the open position

I have gotten good measurements on a variable capacitor doing it exactly the same way I measure an inductor. I use only CH0 and measure reflection (S11). I connect the 2 conductors from CH0 to either

If you have successfully measured numerous inductors, you are also set to measure the variable capacitors. They are both a source port (S11) measurement. Connect the same as you did for the inductors.

Hugen. Thanks for your thoughts. Your point about the demands of new firmware is important. I wish it were easier to get hold of your original product here in the UK.

Larry, thanks for your very detailed responses. I will try to upload two phots of the PCB of my unit (apologies for the phone camera quality). People can use them to make informed choices about their

Hello One walk around. Get a known inductor. Put unknown capacitor in parallell See what frequency it resonate C = 1/(L×fxf) Regards El jue., 16 de septiembre de 2021 7:38 a. m., Joe WB9SBD

OK, I wandered the group site for a long time and went to the HOW TO on the wiki site, Nothing helped me. I have the steps for measuring an inductor down solid. And have probably done a hundred by

Since the STM32F303CCT6 is currently difficult to order, some clones may be replaced with some inexpensive processors. Earlier versions of the NanoVNA-H4 firmware, which allows only 101 scan points

Stephen I found the functional block diagrams of both F302 and F303 series processors, if you're interested. Again, a lot of the chip's internal functionality is not used. The F303 was originally

Larry Rothman Thank you for your thoughts. I was unaware that the full functionality of the MCU was not needed. Personally I take the view that if a manufacturer attempts to replicate a product in

That is an unknown clone. I've never seen that processor in one of these before BUT that doesn't mean it won't work. The nanoVNA only uses about 30% of the internal peripheral ability of the chip

I purchased a "NanoVNA-H4" from Amazon in the UK. The brand is Hima, supplied by ANGLO CT. I purchased from Amazon to try to avoid delivery delays and unexpected import costs. I opened the back of the

Compensation for the delay is part of the normal calibration. You only need to set the delay separately to compensate for a cable or connector length that can't be part of your calibration.

witch pin do I check and what should it read? Wayy too small traces for my multimeter so I have to go lend some smaller stuff tomorrow.

you need check output switch u551, see v2 scheme

nope. does not matter if the frequency is 3mhz - 6mhz or 140mhz - 455 mhz or full scale etc... Always the traces are all around the place.

Your device work in < 140MHz? Check work in < 140MHz on V2 and V2Plus firmware If work, problem in ADF generators or switches