A “Silver” permanent Sharpie pen also works well on Ferrites.
73 Craig AC0DS
> On 8, Oct2018, at 10:32 PM, Richard (Rick) Karlquist <richard@karlquist.com>
> wrote:
>
>
>
> On 10/8/2018 8:01 PM, Tim Duffy wrote:
>> DX Engineering has nicely color coded ferrite - #31 1.4" OD.
>
> The problem with color codes is that you need a lookup
> table to decode them. And you need to mark the vendor
> so that you know whose table to use. When I see a color
> coded core I think Micrometals, not Fair Rite.
>
> I prefer to mark cores with white-out pens so I
> can write whatever text I want such as F/R 33, etc.
> It is also possible to wrap the core with white
> electrical tape and write on it with a sharpie or ball
> point pen. A 3rd alternate is to use a P-touch labeller.
>
> Rick N6RK
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