On 10/8/2017 4:05 PM, Carol Richards wrote:
I am finally getting to clean out my shed with 50+ years of
accumulated stuff. To my surprise, I found new in the box, 8, 2.4
inch cores that I must have purchased from Amidon, many years ago.
According to the spec sheet that was included, they are 43-mix.
Furthermore, there was a picture with instructions to wind 3 1/2 turns
of RG 213 coax through 2 binocular stacks of 4 cores.
What is the prevailing wisdom? Should I do it that way or what?
Hi Carol,
My take on it is in k9yc.com/RFI-Ham.pdf
What you describe would be a pretty effective common mode choke for a
tri-bander, or other antenna covering 14-28 MHz. It would be
considerably less effective at lower or higher frequencies. And for use
below 5 MHz, #31 material is superior.
73, Jim K9YC
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