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Hi myy NanoVNA was shipped w/o a battery. Thought that's no problem, opened the back cover and realized that my battery doesn't fit into the connector which is installed on the board. You can see it

Dave, You are very welcome. :-) -- Rune / 5Q5R

Hi Nan VNA2180 that Steve used have 50 ohm impedance on both ports (A & B). So those formulas will work if vna ports of NanoVNA have 50 ohm impedance. But do they?

The crossover point between the real and imaginary part of the complex permeability is a good marker on the usable bandwidth or upper application frequency for the ferrite. Obviously the higher perm

I am retired and I like to learn new things. I am a ham and l like experimenting with antennas. I am interested in xfmrs for efhw antennas. I have a VNWA and thought it would be fun to play with the

David F4HTQ wrote: "finally I do not wait for the weekend :)" ------------------------------------------------------------------------------------- The test method you described seemed simple enough

Because I am new to all this, I'd need some specifics about that. This thread is comparing what is apparently two VNAs from different Chinese sources. I will pull the case in a few days and compare

Check out e-Pay. You can get 50 pcs for $1.25 AND free shipping. 73, Dick, W1KSZ ________________________________ Sent: Thursday, November 14, 2019 5:34 PM To: [email protected]

As Herman said, they can be had on eBay https://www.ebay.com/itm/50PCS-Slide-Switch-SK12D07VG2-Toggle-Switch-2mm-Stents-Toggle-Switch-BBC/142724639312?

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