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On 7/4/23 11:16 AM, WB2UAQ wrote: > Mike and Alan, > I measured the loss factor for PVC and it was about 0.005 or so at 1 kHz. I did more measurements at RF but will have to go back to old note

Mike and Alan, I measured the loss factor for PVC and it was about 0.005 or so at 1 kHz. I did more measurements at RF but will have to go back to old note books. I made a simple fixture to test a

It's PVC water pipe. -- Mike

Most coils have some parasitic C (it can be quite large). That C has a voltage on it, and a lossy dielectric leads to loss.

Hi Pete. The inductor is supporting a propagating field. It is both magnetic and electric. You are correct, while the magnetic properties of a core are key to control loss, so are the dielectric

You can change the setting in the menu to display R+jX instead of the default R +inductance/capacitance. Roger

Alan, How does the loss factor of the dielectric that the coil form is made from impact the magnetic circuit? I have heard others mention this but with no explanation. Thanks, Pete

Good evening! I would very much appreciate recommendations on the best version of the NANOVNA that displays reactance values for the markers on the Smith chart, instead of inductance and

Excellent Mike. So that is a Qul of 348. I spilt the difference between 6 and 8 ohms... lets say 7... From the appearance of your coil, that seems reasonable. The material you wound the unit on has a

OK I had a go at this with my NanoVNA and got the attached result, which if I follow your calculation correctly equates to Rq = 8.05 ohms. Coil64 estimates 5.9 ohms which, given the less than ideal

Return it and get a refund. Then go to R & L Electronics and purchase a genuine one. Problem solved!!! PS... This is the very best advise ANYBODY can give you!!!

Alan I found the article from your earlier link and will give it a go, thanks. In the meantime I repeated my measurement with NanoVNA-App calibrated for 6401points and got a slightly lower value of

I had the thought to get one some time back, and started looking on ebay. It's amazing how many of these units do NOT have any of the coils with them! I know of one guy who took on one of those and

Mike, the article is in this file

If difficulty in finding the paper from EDN and the figures, here is a pdf abbreviated and a test case circuit screen capture. If you are careful in fixture construction depending on operating

I occasionally see them for sale at hamfests. I have gotten a few that way, but I shouldn't have - I haven't used any yet. Not even the big, (relatively) heavy old U.S. military one. If you look for

I am using nanoVNA-H The product was purchased on Ali Express, and I thought it was genuine, but it was fake. First of all, I am a Windows 10-64bit user. What did you do to solve the problem 1.

Thanks Alan I'll have a look at that. -- Mike

Mike 15 ohms is not too far from what a long inductor made with small gauge wire could have. Q of about 143. Pete

Mike, Scratch that idea about the scales because it doesn't work the same at 4 MHz where the Z should be about +j503 ohms.