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OK, glad that's cleared up. I thought I must have done something really wrong to get 4 times the value you reported. I hope Nizar got his answer. I think the best one was provided by Jim Lux. It

Brian, You are indeed correct. The Q calculation is wrong. I ran the simulation at https://miguelvaca.github.io/vk3cpu/toroid.html I will let the author know... Roger Roger

Roger, I think there is something wrong with your Q calculation. Using your X and R, Q = 17.1 / 0.0935 = 183, close to what I measure, although I measure a higher inductance. Brian

There can be some variation in production batches. Amidon does not make their own cores - they buy them from suppliers like Micrometals and Fair_rite. The wire diameter and how you wind can

oops - I meant nanovna

I have no axe to grind here, so do whatever you want. From my small amount of experience in this area, I would not copy and post online, stuff that has a copyright statement. All you have to do is

Because anyone can read at will, and there is no charge to do so. If there are any 3rd party contributions, it is questionable whether any copyright could apply to that as well. It also comes into

My results are somewhat different, especially Q. I don't know for sure that the core is type 6, but it's bright yellow and matches the current photos at Amidon where I got it years ago. I recall I was

Nizar, Attached is a simulation of a T37-6 Micrometals powdered iron core. Note how small a resistance is calculated at your operating frequency. Roger

I have not been following this real closely, but why do you say it was released to "public domain?" I saw a clear Copyright notice with "all rights reserved" last time I looked at that

It's odd that I happen to have the exact inductor in my junkbox. It's wound with #22 bare copper wire over 3/4 of the core, 0/5" leads. Q measures 195 at 14.1 MHz on my HP 4342A Q meter. Brian

Nizar, I suggest none of these measurements are very accurate. You are trying to measure a very low resistance (under 1 ohm) in series with an inductance. The magnitude of the reflection

Yeah, but there is the problem that the resistances are small (compared to impedance), so things which have “percentage uncertainty” (which the VNA uses) will be tough. It might help to look at

I believe it is: F has metal case and much better display when used outdoors. People like it for field testing because of ruggedness and display. I think the H has more features and more active FW

My first VNA SAA-2N in 2020, love the large SO-259 connectors instead of SMA connectors. I notice that my touch screen is not working right. Hit display nothing happens, trace doesn't do anything

Hi WB2UAQ The inductance is a 8 turns around T37-6 Core at 14.124 Khz. The measurement focused on loss resistor to select the one having the lowest loss for filtre application, this require the

QUOTE: 50Khz..30Mhz (calibrated with same load 401 point) ---> 0.100 Ohm + j 26.88 Ohm ==> Q = 268 13.5Mhz .. 14.5Mhz (calibrated with same load 401 point) ---> 0.200 Ohm + j 26.88 Ohm ==> Q=

Not much change in the resistance and why Q can be difficult to determine. The old Q meters (HP 4342, BRC 160, 260 etc. using a tuned-circuit technique) often did not agree very well with the

I think the recent posts by Tim Dawson and Arnold Slag, quoted above, ought to be viewed with some caution. The fact that the public had access to Mr. Duffy's blog does not make that blog "public

Hi All SEESII H4 + 1.2.40 measuring a Ferrit inductance gives a little different values depend on stimulus span selected : 50Khz..30Mhz (calibrated with same load 401 point) ---> 0.100 Ohm + j