[ADXA] Info from W5ZN Noise Presentation

[w5zn at w5zn.org]

This is excellent info Dennis. Thanks for mentioning at the meeting and 
sharing here.

Joel

On 2022-12-04 13:28, Dennis Schaefer wrote:

> 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 <w5zn at w5zn.org> 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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