Hi all, I have in my hands a very nice device called "VNA Master" from Anritsu, model MS2025B. The thing is I am trying to measure a Common Mode choke with this VNA, using S21 mode on the braid of a
Hi all, All sorted. This VNA is not showing Zcm on screen, but, it does show S21 LogMag and Phase at same time so you can see if LogMag value is targeting -30dB to -40dB, at Phase at low levels, then
Hi Jim, One more question. regarding the voltage divider (from your slides) to measure chokes. Should I calibrate the VNA with that voltage divider connected? Thank you very much 73, Maximo _________
This Anritsu VNA can check and save S11 and S21 at same time. So, checking a choke I´ve save the .s2p file including both S11 and S21. This is the result: https://1drv.ms/i/s!AmG0n3993dIchjxswg_HvXxB
Next picture it is more clear than previous one. Same measurement, same choke, at same time, S11 red (Zmag), S21 blue (TL dB). Markers show 0.9 MHz offset. https://1drv.ms/i/s!AmG0n3993dIchj1NPdwk7pQ
Morning all, I am in same situation as Paul, learning lot of things from you, specially Steve, Jim, Wes, etc. One of the new things that catch my attention was to calibrate the VNA with a higher valu
Hi all, Regarding the S11 Vs S21 for Zmag measurements, I've found an interesting article from Keysight; http://literature.cdn.keysight.com/litweb/pdf/5989-9887EN.pdf Two common methods used to perfo
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
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
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
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
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
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
On 160m Tx is relatively easy, achievable. Vertical polarization is good. The key is to be able to Rx. Gain is not the target any more, but signal to noise ratio, and directionability. Sloopers from
Hi everyone, With Dan´s permission, I have modified ZPlots to add some extra S21 calculations. Actually, you can upload any s2p file from any VNA and display most modes: Rx, Xs, Rp, Cp, Logmag dB, ma
Hi all, There is a new version of "ZPlots S21 Xtra" at: http://www.puertobalsillas.com/radio/Balun_Guanella_4_1/Zplots_Xtra.xlsm This improved version allows to show up to eight traces at same time.
Hi Mike, You can consider LUSO 120 http://www.lusotower.com/USA/tower%20120US.html 73, Maximo Howdy! Anyone have any suggestions for a free standing 120ft tower that can accomodate 100 mph wind guest
If you need the manual for the Gem Quad, you can download it from this website: http://www.ea1ddo.es/cubicas.html (Close to the bottom, "Manual" section) By the way, I have two of them. 73, Maximo __
Basically it is same as a fibre boat. First, Epoxy base coat, 2 componenets Second, polyurethane enamel in two componenets 73, Maximo I am making plans for a 16' mast that will hold dual band and GMR