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Did you see the example 9 and 10 from my posting below (out of touchstone rev 2.0 spec)? You can for sure store also impedance in a s1p file if you calculate the Z-parameter from S-parameter - this is

Hey Doug, If you can figure out how to build and tune an antenna with the Nano after a stroke you’re OK in my book (a retired family doc). The body may not follow all your commands but some of the

In a .S1P file it is not an impedance that is described but S11 # HZ S RI R 50 6800000 0.4178235144152254 -0.6694732263322638 For each line you find in order: Frequency in Hz the real part of S11 the

I attach simple Excel file for the same example. It uses some of the in-built functions for dealing with complex numbers. A complete list of available functions can be found at

Hi, https://github.com/Ho-Ro/nanovna-tools When developing my nanovna mini-tools, I am unclear about the "Touchstone" file format regarding the storage of Z-parameters for a one-port (nanovna_snp.py).

Thanks Ed, AG6CX, An interesting read. Kind regards Ed, G8FAX

Hi Francois, Here is a worked example in a simple way avoiding manipulations with the complex conjugate. Based on the example at bottom of page 3 of the document. I will start off with Zn = 2.33 +

I had already browsed this website I did not find the text relevant and, as a result, I did not trust what I was reading there. It lacks, as often, many developments to understand. Example : Back to

Hi Doug The 234/freq is a average, not an exact value. The real value varies with the diameter of the wire element. Much like the lad who puts 7 gal of petrol in his car, drives 243 miles,and says he

What's a lot of fun is to make a ground plane antenna, and then hook up a VNA, and watch how it changes as you bend things. People spend a lot of time trying to build matching networks, when often,

To those interested in Woodward's work, I found the 1953 paper that was referenced in the recent link. Sent FYI. Ed McCann AG6CX Sausalito

The ini file for NanoVNA Saver is stored in this location in Windows. C:\Users\Your user name here\AppData\Roaming\NanoVNASaver\NanoVNASaver.ini Roger

For those wishing to wind their own baluns or even use/test commercial ones, the following may be of interest: Performance of balun with/without center-tap

Hello Jim, I already have small cores, but I am not convinced it was the right material. but I will also try to rewind 1015 transformer, another DIY project;-) I like to test always few 'roads'... By

Also remember that a 1/4-wavelength radiator over a "perfect" image plane (a.k.a. "ground" plane) is not 50-ohms but more like 36 ohms. So, even at resonance, defined by +jX = - jX, the SWR will not

Don't look at just SWR!! Look at the complex impedance R +/- jX. Look at the sign of the complex term, the +/-jX. If it is negative, it is capacitive and needs lengthening. If it is positive, it is

Run the SWR vs frequency plot. Shortening moves the frequency ( at the minimum ) higher. For a ground plane vertical, all the elements have an effect on resonant frequency and the depth of the SWR.

Bonjour Francois: To your first point, your expanded expression in the seventh paragraph for gamma in terms of A,B, and Zo is mathematically correct. But I will say it is not a form I have ever seen

Jim is 100% right! Not worth "redoing" it, possibly not even possible. Not to say that when you are done you need to "weld" your wire to the soldering pad (SMD) in a way that will not get disconnected

Generally, look for where the most pronounced ‘dip’ is relative to the frequency you’re tuning for. It should be close to what you’re looking for. If the lowest SWR is at a lower frequency