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Gary, Have you evaluated the Q at OR near the SRF and then the Q significantly below SRF?

It's not the backlight current as it runs off the 5v line, not the 5V-RF or the 3V sources. Since the unit is new, it's most likely infant-mortality on the part or a counterfeit part was used that was

Hi Brian, Thanks for reminding all about COIL. It takes a little getting familiar with it since you use an interesting GUI interface, but I got the handle on it.? Is there a way to input the coil

As a guess, a thermal issue? 73 JRJ WIYN

Thanks, It looks like the LD01 is defective as only 1V is coming out instead of 3V. I didn't expect to have a defective unit as I posses it only 2 weeks. I'll claim for a replacement rather than

Quick and dirty method... Just measure the self resonance of your coil. If you calibrate the nVNA to your fixture and then just run the S11 sweep up high enough on the coil, you will undoubtedly see a

Brian, thanks for the background information on COIL I have gotten many features to work under Wine in Linux and it is very useful. I may have spoken a bit too soon in implying everything would work

Well, it appears you have some type of hardware failure.. if you reconnect the battery, measure the voltage at the power SW with the USB cable disconnected - it should be 5V. Turn ON and? measure the

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