Is it possible to somehow verify that the U551 chip is the one causing problems?

It is possible that U551 has been damaged.

Here are the pictures of the front and back of the circuit board of the nanovna in as high of a resolution as I can provide with the metal shielding removed.

My bad, the 30ghz was a typo, the s-a-a-2 goes up to 3ghz. I am new to groups.io, so the pictures didn't attach properly. Hopefully they attach this time. I will add more closeup pictures of the circu

Yes you are right, I had just spent a while reading posts between Eric and a couple of users on the tinysa site and had forgotten that I had switched sites before replying. ___________________________

Erik has nothing to do with VNA products - he manufactures the tinySA... Th OP has a product which is an owocomm design.

Firstly any nano vna advertised as performing up to 30GHz is making false claims about its specifications. Secondly it sounds like you didn’t discharge any static from the antenna before connecting th

Hello, I recently purchased a nanovna s-a-a-2 (hardware version v2_2, 50k-30ghz, owocomm design), and after around 2 weeks of work the measurements on the s11 port decided to malfunction. At the time

Many many thanks, mate. It helps me a lot. Finally able to fix the issue. now it is working fine. Again thanks. 73 S21APJ

The new NanoVNA-H utilizes an LCD driven by ST7789, and you can acquire firmware files that end with the suffix SM_ST here. https://github.com/hugen79/NanoVNA-H/releases

I bought a Nanovna-H from China. The language was Chinese. To make it English I upgrade the firmware. Before updating the firmware the display was ok and horizontal. But after the update, the display

Many schematics can be found on Hugen's github repo - some as *.png or *.jpg, but you should be able to convert them to *.pdf yourself: https://github.com/hugen79/NanoVNA-H/tree/master/doc HTH Martin

Can you send me a NanoVNA-H schematic in pdf format please. Best regards S.A.Udaya Jayantha (4S5SC) No. 72, Elliott Road, Galle.80000, Sri Lanka. Tel.: +94774164087 (SMS) web: https://www.qrz.com/db/4

Note that you say you have a "NanoVNA-H" and then you loaded firmware for an -H4 . . . They are not the same device, and my guess is that your issues are due to flashing the wrong firmware (you don't

I tested the board for shorts but i didn't se any, only a little heat on some components but it's probably normal, a voltage injection should help finding shorts but I never done that, i will try to m

Where is this "mode" setting? I was just through all the settings on my NanoVNA-H4 and I didn't see any "mode" setting anywhere. Zack W9SZ

20231102_081555.mp4 <https://drive.google.com/file/d/1aWBmFXnzeKGvgE_hfkJSyb2M7Tu1Zyh1/view?usp=drive_web> Hello Zack, Thank you very much for your quick response. I would like to mention what's happe

As I see S11 measure not work (hardware problem). Need check all related to reflect signal measure Generator, and audio codec work (no pr6in S21).

Tried all but nothing, seems an hardware problem

I done a complete reset, this includes the calibration reset