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Hi Brian Thank you , and great work , i am still not familiar to , it seems great and can be developped more , if any youtube video can help us step by step how to use it , it will be very helpfull .

Alan, if I were to display several Q contours simultaneously, what values would be most useful? This would require no user input. Brian

Routine I did inputs a single Q contour value. The Q=1 is a default value. No input required. This value of unity at one time was used and provided with vna instruments as an overlay or etched into

Nizar, this program will do that: https://k6sti.neocities.org/splot.htm Brian

Hi Jhon A graphical X4 zoom option on the future firmware around the center of the Smith shart can help to show more easily the impedance focusing on the center plot of Smith diagram . 73's Nizar

Hi Jhon In fact I redo the measurement of the characteristic impedance of the first balun with more care of bad contactes, i measure Zc=60 Ohm see screenshoot below , wich gives SWR = 1.2 with 50 Ohm

Jim, I had the same thoughts myself, and earlier today I decided not to pursue graphical matching any further. My first impulse for a design problem of any complexity is to implement an optimizer. I

At some point, too, it's addressing a pretty niche need (essentially lumped component multisection filters). I would think that most people today designing a multi section filter use some sort of tool

Don, this sound like high values for the constant-Q curves would be necessary. Is that right? I'm trying to avoid keyboard input, such as specifying Q for one of these curves. So far the only keyboard

When making a graphical multi-section matching network solution, the constant-Q curves guide your component choices, to avoid unnecessarily constraining the bandwidth. The idea is to have each

A phase vs frequency plot helps identify where the middle of the transition is. Sometimes that's easier than trying to find the -3dB points. A classic S curve from +90 to -90 degrees phase, and 0 is

Thanks for all the details, Alan. My program does have group delay, which is differential phase shift. It does extract Q from S11 or S21 when measuring inductance. I've changed to displaying SWR

The rectangular plot of the one port S data is insufficient to determine Q. You will need the differential phase shift of the reflection coefficient as well. Taken together with the appropriate

Thanks for reminding me, Jim. I've been meaning to look into log scales, both x and y. Right now everything is linear only. Brian

OK, I see you calculated Q from the marker frequency values. Interpolation would be easy and would improve accuracy. Maybe I could add interpolated Q calculation to the marker. Looks like I would need

There's lots of different ways to plot the same data, and people develop their approaches based on the ones they're familiar with. I guess, too, in the "bad old days" when plots were done by hand (or

Thanks for the illustration. How did you get Q = 145.8? Why does the rectangular plot needs phase slope added to discern? Is the dip it too broad and shallow? A rectangular phase plot is available.

Here is an illustration... attached.

This is true for some measurements but not all... Consider a one port measurement, only S11, for a shunt series resonator.

The jig is made using one section of the commercially available NanoVNA test board. Available on eBay, Amazon and from Chinese sellers. You can find discussions about this board on several posts in