Chuck,
Material "J" also known as material "75" generally has a permeability of
5000 while "31" material has a permeability of 1500. I would leave well
enough alone.
Larry, W0QE
Chuck Hutton wrote:
> Hi -
>
>
>
> I've been using up some FT240-J cores to wind common mode chokes for Beverage
> antenna feedlines. I use these antennas only for LW, MW and 160 m listening.
> In looking at the Fair-Rite data for #31 cores, it looks like there is not
> much difference between the two for MW and 160 m usage.
>
>
>
> #31 seems to be the favorite these days, but given that my chokes are already
> wound isthere much point to udoing them and using #31????
>
>
>
>
>
> Chuck
>
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>
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