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finally I do not wait for the weekend :) This is the curve for 61 http://alloza.eu/david/WordPress3/wp-content/uploads/2019/11/image-3.png ( one turn of emailled wire on BN61-202) There is the

Thanks, Rune. That SW is a downright winner. Thank you!!!!!!! Dave - W?LEV

I would like one or two of those switches.? I live in Los Angeles.? Where did you get them, and are you willing to sell me a few? Bob

This is the topic that lead me to the nanoVNA https://www.hamradio.me/antennas/where-a-choke-chokes.html

Hi David How is you test setup ? A single short wire thru the core ? Kind regards Kurt -----Oprindelig meddelelse----- Fra: [email protected] <[email protected]> P? vegne af David F4HTQ

Hi Herb, For the curve i post as example, i just made one tun of emailled wire of BN43-202 ferrite. I also obtained accurates results with 61 and 73 ferrites materials. (I don't own 31 material). I

That would be permeability. Physics degree not withstanding. I never could keep them straight! Dave - W?LEV [email protected]> wrote:

Yes, what was your setup for the type 43 material permittivity measurement? Dave - W?LEV [email protected]> wrote:

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

More images, a puzzle, and some explanation...like real estate, it may be location, location, location To begin, it's true that I was open on CH1, but the image shows that both devices were displaying

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