http://hamcom.dk/VNWA/How%20to%20measure%20very%20high%20impedances.pdf Dan, AC6LA _______________________________________________ _______________________________________________ TowerTalk mailing li
Terribly sorry. There is an English version: http://www.hamcom.dk/VNWA/How%20to%20measure%20very%20high%20impedances.pdf BTW, here is another take on this: http://www.w0qe.com/Measuring_High_Z_with_
Exactly right! NA6O reported exactly the same comment to me in private email. Z is not a single-valued number, it is a variable and it is complex. I'm currently in the middle of a project measuring
On 1/1/2018 3:00 AM, Steve Hunt wrote: ... The problem is that models picturing capacitance between adjacent windings are overly simplistic; the winding needs to be treated as a transmission line in
Wes, Thanks, I hadn't spotted that one! Steve G3TXQ On 03/01/2018 19:40, Wes Stewart wrote: On 1/1/2018 3:00 AM, Steve Hunt wrote: ... The problem is that models picturing capacitance between adjacen
For completeness, here's the data referred to by G3RBJ in his paper: http://www.g3ynh.info/zdocs/magnetics/appendix/Toroid_selfC.html Notice how the self-capacitance falls as the number of turns incr
Steve, Over the last week, I've been collecting articles and data on various S11 versus S21 methodologies for use with RF choke CM measurements. In your S21 measurements, are you still using a resist
Hi Paul, No, I no longer use the 50 Ohm termination at the jig. I originally included it because I was using long RG174 patch leads between the VNA and the jig and wanted to minimise coax loss at the
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
Measuring high-Z chokes accurately is challenging, and it's easy to become obsessive about this stuff. I know because I'm probably one of the worst offenders :) But then I ask myself:: if an uncompen
That's "good enough" agreement for me:-) Wes N7WS But then I ask myself:: if an uncompensated 0.5pF jig capacitance, or uncompensated jig leads 1 inch long, cause an error in the choke measurement t
For me, the answer is in understanding the measurement limitations in order to determine what's "good enough." Without understanding the limitation, then we are in a guessing game with ourselves. I
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