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Depending on how the conversion from reflection or transmission coefficient (gamma) to R+jX is done, a coefficient with magnitude >1 will result in negative R. If you're measuring low impedances (so

Disconnected battery still doesn't power up at usb only. Am 12.10.2021 um 15:11 schrieb Larry Rothman:

So, your nano is now no longer working at all even after letting it stay off for a while?If you open the housing and remove the battery, see if you can power the unit only from USB. If yes, then the

That "-2" suggests to me that you're not actually reading 'Resistance' there. Resistance should be positive, but Reactance can be in negative ohms. Since high Q _requires_ low R, it's going to be

Thanks for the feedback, Dave. I didn't mention that COIL is a Windows console program. I gather that wineconsole is necessary. I forgot to mention that a user should first read README.TXT. COIL

Hello Larry, Thank you for your reply. No that doesn't help. Am 12.10.2021 um 13:47 schrieb Larry Rothman:

If you immediately cycle the power off then on, does the unit start running ok again?

Hi All, While running NanoVNA H4 with Nano saver via USB abt 1 hour the NanoVNA H4 screen gets blank. The NanoVNA H4 desn't reboot, USB connection is also lost, only blue LED beside the mini USB is

Brian, thanks very much for the link to your program. It seems to run fine under Wine in Linux. Dave

Andrew, my coil program might interest you. It calculates inductance and Q for solenoids made of solid or Litz wire. It models a number of wire alloys and form dielectrics, dielectric ribs or ridges,

A useful article; http://w7zoi.net/twofaces.pdf

- I am guessing a “trap network” is a series resonant circuit, but I’m not sure. YES, IT IS A SERIES TRAP NOT A PARALLEL TRAP BUT IT IS IN SHUNT WITH THE OUTPUT, CH1. SO THIS IS A S21

There is some older firmware with quite large fonts (see the group wiki) but the latest firmware by DiSlord and Hugen do not have these large fonts. However the font face has been improved to make it

All good questions Andrew. Standby while I compose some answers.

Hi all, sorry for the basic question. I own a regular NanoVNA (small version) which I purchased via Amazon / AllAboutFun. Where can I get a recent firmware update? I am specifically interested in a

Great, thanks! I can see that your article addresses the issue nicely, but it also uncovers so many questions a non-EE like me has: - I am guessing a “trap network” is a series resonant circuit,

see msg #23812. Also type in Q measurement to the search box.

I am neither a programmer nor trained in electronics, but I am having a great time using my nanoVNA-H4 with my homemade crystal radio. I measure S11 using only CH0, and the results I get for Smith

David Reichard: That's not what I thought about, maybe it's a language barrier issue, I'm using a translator.The SWR meter designed for 50 Ohms is only able to measure SWR for a 50 Ohm antenna system,

Btomek: I think you are saying "A moderate change in impedance (resistance + reactance) has little effect on thee SWR/reflection coefficient when the SWR is close to 1:1 but a large effect when the