Tony,
This is a good explanation and guidance on the utilization of a toroid
core's window area. You can use it to find the ID you need.
https://www.mag-inc.com/Design/Design-Guides/Powder-Core-Calculations
73, Dan
On Mon, Apr 5, 2021, 4:30 PM Tony <73guddx@gmail.com> wrote:
> All:
>
> I'm looking for mix 75 cores to build a common mode choke similar to the
> one Paul, W1VLF shows in this video.
>
> https://www.youtube.com/watch?v=dcXq6u64HXg
>
> The plots show the choke to be very effective on the 2200 and 630 meter
> bands as well as 160 and 80 which is what I'm looking to use on my
> receive loop.
>
> Not sure what the inside diameter of the cores are that Paul uses, but
> they are large enough to get 25 turns of RG-178 around them.
>
> Any suggestions would be greatly appreciated.
>
> Tony -K2MO
>
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