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

None of these are 'clones', they are all copies with slight variations. As the original design was open-source, anyone can manufacture these. All the units above are nanoVNA-H and you can use any firm

Hello I have this nanovna labelled "-H", but from info online (including the wiki here) it seems to have the PCB case from the original nanovna along with maybe a -H pcb? The info screen says "NanoVNA

Punch out the plastic and the pins to reduce the wear of the standards. <landrjoh@...> wrote:

I got tired of trying to keep track of all those little SMA calibration standards and adapters that I keep with my NanoVNA, so I made a thing! It's a small pcb that uses common 1/4" wide edge mount SM

There is no way that I know of to do this, an amplifier is a one-way path. The gain and reverse isolation of the amplifier would not allow a useable reflected signal to flow back to the VNA to be meas

Can't that be calibrated out in advance using attenuators.

Putting an amplifier after the VNA port 1 would result in measuring the S11 of the amplifier not the resonator. AFAIK to do this kind of measurement with an amplifier would require access to the inter

Proposed VNA electron-spin probe... Use the NanoVNA's S11 measurement mode to probe a high-Q resonator enclosing sample material. NanoVNA generates the RF, and also detects the RF signal. When electro

Yes the DC field is just the standard Helmholtz coil. Cavity design and impédance matching with a nanovna or Robinson oscillator set up? https://youtu.be/OnYT6L6XdIg?si=pcRqlWsurSd3Hrps

Interesting app, similar to a grid-dip type app, where a LC resonator is probed. I'd imagine a high-Q external resonator would be needed. With 50-ohm source and 50-ohm load, high loaded resonator Q is

Has anybody tried using their nanovna to do ( ESR) election spin résonance experiments?

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