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

So I have SAA-2n that was working have maybe turned it on a few times at most... Went to test my new ant and cable today and the screen would touch to have menu come on but that was it... the test was

Antonio, I have zero experience with GAN Gary W9TD

Yes, sort of. Compare the NanoVNA measurements (like SWR, and maybe impedance values) with the claims made for your design. If they're close, you got it right. But it's really nice to have the nanoVNA

Hello Hugen, DiSlord and others, First: I know that this is a user and not developer forum. So please apologize for getting deeply into the code (for anyone not directly involoved). This is my first p

Hi Steve, try using DiSlord to make up for what the Japanese stop. He may be receptive to this. Write down what you want to see that is not already in the firmware.

Strictly speaking, there should be bounds on the R,C,L terms so they are less than one. Otherwise a second order system, a tuned network which must posses two memory components vanishes. Consider if R

ps.: Group V2 link: https://groups.io/g/NanoVNA-V2/topics if you cannot download, you will need to log in to the group.

Hugen Can I suggest you use the same values of R25 and R24 in the attenuator circuit for the CH1 input as those used in for the reference SA612? And then set R22 to come to 50 ohm? This will reduce th

Hugen, I noticed on the new NanoVNA-H4.2 PCB there is an unpopulated silk-screened area labeled "CARD1". Does that imply that a SanDisk card is in the works for a future version of the NanoVNA-H4? Als

166 µH is a pretty large inductor and likely has a pretty low self resonant frequency. Try 'de-Qing" the inductor by parallelling it with a 4.7 k to 10 k carbon resistor. If those work, increase the r

In addition to 10kHz chirps, I hear a prominent tone ~ 300Hz when testing phono inputs. I suppose that is the rate at which nanoVNA steps frequencies; it increases about 10% which switching to CW. Is