Hi all, I know there is a formula to get Rp and Cp from S21 or S11 data (LogMag and Phase, or R & I). Anyone know that formula? It is to use it in Excel and get Rp and Cp from the VNA´s exported data
I know there is a formula to get Rp and Cp from S21 or S11 data (LogMag and Phase, or R & I). Convert S11 from logmag, angle to complex Z = Z0 * ((1+gamma)/(1-gamma)) in Excel gamma = imcomplex(10^(S
Hi Jim, Great stuff. I´ll try later on. By the way, I´ve found a similar formula but I am not sure if it is same results as yours; http://www.dicks-website.eu/compleximp/enindex.htm#serpar We have th
Just test them. All are same results. Three different ways to get same results. Thank you again 73, Maximo Hi Jim, Great stuff. I´ll try later on. By the way, I´ve found a similar formula but I am no
This, of course, is classic circuit analysis that we learned in our first EE year. If, however, you have a plot of data vs frequency that you can identify as a parallel resonant circuit, there's a re
Hi Jim, Steve, all, Playing with those formulas I´ve got an inconsistency. To get R and jX from LogMag and Phase I can use two different formulas, one from Steve and one from Jim, but the results are
You're over-Excelling the problem, Maximo. Best to go back to fundamentals. A simple parallel resonant circuit looks like an inductor below resonance and a capacitor above resonance. Go far enough aw
Jim, the thing is I need to compare two different plots, in same chart. So I am downloading the .s2p files with the data, then in Excel I can do the necessary maths and plot the results. Then present
Playing with those formulas I´ve got an inconsistency. To get R and jX from LogMag and Phase I can use two different formulas, one from Steve and one from Jim, but the results are not same, so I don´
Maximo, My formula derives the series equivalent Resistance (Rs) and Reactance (Xs) of the choke from Mag(S21) and Phase(S21). If you want to check it, place a 4k7 resistor directly between Port A an
Playing with those formulas I´ve got an inconsistency. To get R and jX from LogMag and Phase I can use two different formulas, one from Steve and one from Jim, but the results are not same, so I don´
I thought Maximo was trying to derive R and X from S21 measurements, not S11 measurements - at least that's what his Subject line suggests. Steve G3TXQ working in Octave (free version of Matlab), whi
Steve G3TXQ I'd have to go back and look - maybe that's the hiccup I'm still curious about the Excel/Octave variance though. working in Octave (free version of Matlab), which is a bit easier than Exc
In his text he said both. Steve G3TXQ _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.cont
Is a different formula to convert LogMag(dB) & Phase from S11 than from S21? I thought Maximo was trying to derive R and X from S21 measurements, not S11 measurements - at least that's what his Subje
Yes!!!! - S11 Magnitude and Phase are quite different from S21 Magnitude and Phase. If you are interested, here's how I derive the choke's complex impedance from S21 Magnitude and Phase: http://www.k
Is a different formula to convert LogMag(dB) & Phase from S11 than from S21? No, it's the same. But calculating Z from S11 (a one port measurement) is different than calculating it from S21 (a two po
If you are interested, here's how I derive the choke's complex impedance from S21 Magnitude and Phase: http://www.karinya.net/g3txq/chokes/s21.pdf The conversion of Mag/Phase to complex values is the
Going back to Maximo's original question (more than a week ago, I think) he was using an Anritsu instrument to measure the choke, and the available options for displaying data do not include the abil
Hi Jim, I agree, the VWNA is at this time best VNA option up to 1 Ghz for bench use (with computer). The reason I don´t have a VWNA is because I need a VNA to use it in the field as well, with no com