开云体育

Yes, for whatever reason you got a lower apparent reflection coefficient on the left-hand unit. This is reflected (so to speak) in the noisier-looking phase trace. Results with an S21 measurement of a

On Thu, Nov 14, 2019 at 02:06 PM, David F4HTQ wrote: " The values do not match those of the constructor curve ( to have the right value the software might know the exact geometry of the inductor) ,

I have 50 pieces of it (could not buy less) . I get them on Ebay search string "50PCS Slide Switch SK12D07VG2 Toggle Switch 2mm Stents Toggle Switch UK". U must have exact the right type. You can mail

There are only two kinds of software : the DFU files for Firmware install, and the different software(s) for use the NanoVNA on laptop/PC. And you can find tim all in the Wiki. on1bes

Hi David, the .dfu files are firmware versions for the NanoVNA. There are several Windows apps available for the NanoVNA. I made NanoVNA-Saver: https://github.com/mihtjel/nanovna-saver/releases/latest

I Bob, It very basic. I made one turn on BN43-202 ferrite core and connect it to CH0 of Nano VNA. And put frequency range to 100Khz -> 30MHz with logarithmic scale on all axes. David.

Are there any and where online do I find them? The file extensions I am seeing are "DFU" which is an Apple thing. No tthat I particularly believe in Windows, but all my engineering and scientific

? is the magnetic analog of ε, the dielectric constant. ?0 is the permittivity of free space ε0 is the permeability of free space. The ?r which you are seeking is the relative permitivity of the

David, can you explain exactly how you got the curves?? I would like to do it also. Bob

------------------------------------------------------------------------------------------------------------------------------ Larry, Don't let the terms overwhelm you. If you've never used a VNA

Hi Larry, You can found some details on the document linked to this message. David.

As usual, I found the answer right after I asked the question. One is lossless permeability the the is lossy permeability. Found the answer in a Fair-Rite printout. Larry n0sa

Okay, I have been reading a bunch of stuff on ferrite cores. My main interest right now is xfmrs for EFHW antennas. I see charts with u' and u" (mu' and mu"). I can't seem to find an explanation of

Hi All, I add some explanations. I asked Rune if he could add this graphic because it is very useful. It display curves that have exactly the same shape as the complex permitivity curves (μ'r and

Thanks for all the good links, looks like I have a lot of reading to do. I am trying to learn all this stuff and it takes me awhile to get my head wrapped around all of it. Larry n0sa

And given the impedance in series format, it is possible to convert to an equivalent parallel circuit - and vice versa.? The equivalency will only be valid over a limited frequency range. ????

You have connected the 50 ohm load to CH0 and you are looking at noise on CH1 More noise implies better isolation and that is what you want (I think....) -- NanoVNA Wiki:

Hello all, I broke the power switch on my nano. Does anyone have a part number to it? I did some searching but could not find it. Thank you Marco

I have 2 NanoVNA, one bought from AURSINC on Amazon, which I originally thought was not a knockoff, and one bought from a link provided by Hugen, that I learned of only after getting the AURSINC and

Oh - and as for the size of a larger battery - several forum members including myself have used larger cellphone batteries up to 1500mAH. You can just solder the wires directly to the + & - pins of