Very good info, Joel, and I enjoyed all the presentations and the fellowship. It was good to get together again. For those who have unknown ferrite toroids (such as those available at the Wye Mountain sale), here is a method to determine what type they are. I used this to decide that the ones I got were 240-31's. It's simple, just wind several turns and measure R and X. Look at the chart and see where R and X are equal. In my case, R and X were equal at about 3.6 Mhz, so I believe mine are type 31's. Owen Duffy is a trustworthy source, like Jim Brown and Tom Rauch.

https://owenduffy.net/balun/concept/cf.htm

73,

Dennis/W5RZ

On Sun, Dec 4, 2022 at 2:16 PM <[email protected]> wrote:

Info from my "Noise" presentation yesterday for those who inquired:

#31 Mix toroids - These are the two inch diameter like I showed:
Mouser # 623-2631803802
Fair-Rite Part No:2631803802

Jim Brown, K9YC, paper on RFI and toroids:
http://k9yc.com/RFI-Ham.pdf

Steve, VE6WZ YouTube video on noise cancelling (You all need to watch this):
https://www.youtube.com/watch?v=Gt0Hokz_m3w

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