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Victor, I notice that in these examples you are using the nanoVNA with the saver software, connected to a computer via USB cable. When I do a similar setup, I note that the USB cable to the computer

Hi Vaclav, Please type “P3 uart” into the Search box in the upper right to help to identify this board level change. Larry AC9OX

I forgot to add that the NanoVNA measured Impedance (based on the S21 (or S11) 2port series through): [image: afbeelding.png] matches quite nicely the theoretical simulation of a choke:

Many years ago I made a BIG mistake by signing up with my real name. I get unwanted , unsolicited e-mail addressed to that mail box. I am opinionated and I do not pussy foot around issue , I tell how

Could somebody just confirm that I am on the right track ? I do not see "P3" - UART connector on my hardware. https://github.com/ttrftech/NanoVNA/blob/master/doc/nanovna-sch.pdf PS To the person who

Thanks Rich, your spreadsheet also helped me to spur on some of my work. Thanks for sharing! All the best, Victor Op za 11 jun. 2022 om 21:41 schreef Rich NE1EE <TheDustyKey@...

Thanks Roger and Owen, Remember that the S11 formula from https://xdevs.com/doc/HP/pub/5988-0728EN.pdf and NanoVNA Saver (and my own Excel spreadsheets) already takes away the 50ohm (Zload) of port 2.

Thanks for the comments to spur me on...I earlier felt that I had better clean up the spreadsheet just to avoid more confusion, but never took the time. Glad that it's turned out to be of some use.

Here is one of theS11/S21 test jigs I tried. It could use improvement but I don't have the time right now to continue with this project. Roger

Hi Vaclav Sal, I just went to “FB Nano VBA and Tiny SA” and saw the messages that you had previously posted regarding your issues. I believe that your choice to use the alias “Anne Ranch” on

Victor, Let me preface my comments by saying that I have built several test jigs for measuring impedance using the S21 series method and tried several ways to compensate for errors. None have been

Op za 11 jun. 2022 om 08:32 schreef Victor Reijs via groups.io <pe1atn.victor.reijs@...>: By the way, NanoVNA Saver uses also these formulas to plot the S11 and S21 for the 2port

Hello Roger, Using Series though, the NanoVNA measures both a S11 and S21 (for that configuration, which I [of course] calibrated). The link I gave ( https://xdevs.com/doc/HP/pub/5988-0728EN.pdf ),

Victor, I am not sure how you are measuring the DUT using S11 reflection and S21 series methods. You have to measure them with the correct reference plane calibration and this usually requires two

Glad you solved it, and sorry I did not reply earlier . . . we were out for the evening . . . -- Sent from my Android device with K-9 Mail. Please excuse my brevity.

Ahoy, Belay my last.... I found my way and cleared out the incorrect firmware. It took much searching thru many messages plus wiggling the usb plug. But now I have the version git-20201013-32077fd

Hi Rich: Thanks for the correction. You are absolutely correct as presented, .016 for this leads one to the 35.917 dB answer And your cell was L4 not M4. Glad confusion removed on final version.

Hello Roger, I thought that the method I used now for the resistors was working. And it seems to work at least for these 4 resistors (330, 985, 5160 and 21800);-) But I now did a 1:1 Guanella choke as

Follow up - the new firmware I uploaded was the wrong one, and I cannot get to a dfu mode either by -QT, the screen menus or by toggling the left jog and switching on and off. I went thru all the menu

Thank you Igor and Dislord. I just acquired a new NanoVNA H4, after using my original NanoVNA H for the last several years. With all features of the H4 over the H model, it is like starting all over