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Erik, dl1ecd, https://eleshop.de/nanovna-h4.html Nach der Bezahlung in 4 Tagen geliefert. Vladimir, dl7pga

Hello Erik, dl1ecd! You can buy last HW Version 4.3 of NanoVNA-H4 here: https://eleshop.eu I have NanoVNA-H4 HW 4.2 from Zeenko Store since 1 year - Micro sd slot, but no clock crystal 32768 Hz

Great, I had a similar experience while attempting my first H4 upgrade. As you say you must first?CHOOSE the new firmware file to load the file into the DFU Demo program. Then select UPGRADE?to

Today my nanovna-H bought in 2019 seems to have died. I connect it to a 5V source and after a few minutes I see the screen flicker a few times (white then black). I also notice that the traces change

I am certainly no expert here, but my experience points to a security setting? chris_at_levingston.net_na0l@...> wrote: *N A 0 L* *_ . . _ _ _ _ _ _ . _ . .*

This was the fix. Select the software then click upgrade in DfuSe Demo, never click the upload button. Thank you very much.

My Android phone has always worked with the NanoVNA app and I now get a “No Device Found” error. Any ideas, please? C connector to C connector cable which works fine using NanoSaver on my laptop,

I've dropped the optional .s2p output. Just use the .s1p the program creates. Here are some curious plots for a file K0JHL sent me. Some sort of narrowband thing. The only processing difference (both

This may also happen for a different reason: the DFusedemo program uses "Upload" and "Download" backwards from what many of us think. Upload fetches the data from the nanovna and stores it in a local

Greetings, It is basically a two step process as I recall. (Step1) You first read the new firmware file into the dfu demo program. (Step 2) Is writing the actual file into the device. I hope this

I have a new NanoVNA-H4 that I purchased from RandL directly. When I look on the device it shows version 1.0.70. I am trying to upgrade the firmware. I am able to put the device into DFU mode using

I upgraded the nanoVNA-H 4 to v 1.2.14 and now nano Saver runs OK.

My NanoVNA-H 4 is running V 1.0.39

I have the same problem when I connect the to the VNA, Nano Saver app closes. Nan Saver is V 0.5.4 NanoVNA -H 4

More insignificant differences. The animated GIF shows impedance for the Y21 method (no notation) and S21 method (CM suppression disabled) for a 12-turn choke on a F240-31 core. The Y axis is ohms.

Yes, the differences are amazing. When I first started on my "journey" of building and measuring common mode chokes, I began with the S11 method. It was easy and I didn't have to make a full cal. of

Yes, the difference between the S21 and Y21 methods is small for the 2.35 pF stray capacitance exhibited K6JCA's test fixture. But not all stray impedances are so benign. Attached is an animated GIF

Excellent write-up. Thank you for forwarding it. I have always used the S21 method to characterize the common mode chokes I built and measured. I've also determined the characteristic impedance of the

Dave, errors when measuring impedances with a VNA can be insidious. You might want to take a look at this: https://k6jca.blogspot.com/2020/07/the-y21-method-of-measuring-common-mode.html Brian

John, a couple of years ago I went on a common mode choke building and measuring kick. I wrote the procedures up and I believe you can find them in the Wiki or archives filed on this group. I wrote