开云体育

While the file format spec may define formats for things other than S parameters, they're not particularly common. Not to say that they don't exist, but every tool I've used only uses S parameters. Th

Hey guys, Bringing the? reactance to zero (if you really want that for your antenna), don't forget that there might be a coax cable involved in the measurement set-up.? That coax can move the Z of

I agree with W0LEV 100% on using the phase information to guide one's tuning efforts. That valuable phase information is what puts the "Vector" in "vector network analyzer"(VNA) and is what makes it

Sorry, checked the wrong input file, scikit-rf cannot read Z-Parameter (NotImplementedError: only s-parameters supported for now.): Traceback (most recent call last): File "<stdin>", line 1, in

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