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David: This shop has a history of people without any radio experience, and I am being ignored as to my reasons why everything needs to be rebuilt. I suspect the owner is treating a business, as a

Eric, Take a look at message 17063. It discusses how to set up a NanoVNA to do TDR in a manner that allows direct reading of the impedance along a connected line. Using the reflection times, you can

PS: The equation might not be solvable analytically; among other things because tan() is a periodic function. When I did similar calculations, I already had an estimate for the parameters (impedance,

FIRST ATTACHMENT: With an 'average' RT of 15 dB, I doubt much RF is getting to whatever is at the far end of the coax! The vast majority of the data indicates lossy coax. The coax is pretty lossy!!!

Look at how a transmission line transforms a load impedance: https://en.wikipedia.org/wiki/Transmission_line#Input_impedance_of_lossless_transmission_line The NanoVNA measurement gives you Zin = Rs +

Okay, I saved each image, 1 through 4. THese should now paint a better picture of what I am dealing with. I have no clue which antenna these readings are for, and that is one tiny problem I doubt I

Just do a screen capture, or "Print Screen", paste that into an image editor like Irfanview, and go from there. Dave - W?LEV wrote: -- *Dave - W?LEV* *Just Let Darwin Work*

Well, the saved files did not attach as I expected, and the only means to view, is copy them to Nano-VNA-Saver app. Clearly, I did something wrong, I apologize. First time using the application.

Greetings all: A funny thing happened on the way to........... At my work, we have a moderate selection of antrennas, but the issue is, nobody ran the cabling that identifies those antennas, or the

Here attached is a short brief on simple Z matching. Alan

Good point. It will be a coplanar waveguide with ground or microstrip lines with signal side ground plane (see: https://chemandy.com/calculators/coplanar-waveguide-with-ground-calculator.htm ) --

I know, but I like to have a method that works for "any" impedance/length and "any" frequency combination This because the impedance is frequency dependent and I can not modify the length or target

Is it really stripline, and not microstrip? See difference at https://www.mwrf.com/technologies/active-components/article/21846859/whats-the-difference-between-microstrip-and-stripline Dave

Erik, try the 1/8 lambda method? Arie Kleingeld Op 27-10-2020 om 16:24 schreef Erik Kaashoek:

I'm trying to measure the (frequency dependent) characteristic impedance of a 3cm stripline using a nanoVNA-H Attached the measurement using nanoVNA-App. Using RFsim99 I calculated that a 3cm

Ah, my version of saver was too old.? Updated and everything's working fine.? Sorry for the noise and for not checking the obvious. (Thanks https://github.com/NanoVNA-Saver/nanovna-saver/issues/)

What is the difference between the curves in "Real/Imaginary" vs "R+jX (Ω)" Charts - in NanoVNA Saver and NanoVNA 2_2 ? What do they represent, as they usually have resonance on different

Thanks Steve L, after much searching and going on wild goose chases, I finally figured out how to get into the Windows 8 device manager (Windows is not my native language.) It shows I indeed have the

Hello Barry, a lot of work you did to collect all these slides together and also a good presentation but too long for 1 hour. First you schould remove slide 16, because everything is said in slide 17

Sounds like you will modify your presentation. Could you list the modified version? I'll look at it to improve my knowledge. Jim