Brian,
If the toroid cores have a painted color on them, they are *not* ferrite
cores.
The ferrite cores are a dull gray. The more common ferrite cores are
type 43 Mix, but could also be a 61 mix. The 61 mix is a lighter shade
of grey than the 43 mix.
For reference, the tiny cores used for winding the KSB2 RFC1 and RFC2
are FT25-43.
The FT designates a ferrite material,
The "25" or "37" (or any other number) is the outer diameter in inches x
100 - i.e .25 inch diameter is 25.
The number after the dash is the ferrite mixture type.
I hope that helps.
73,
Don W3FPR
On 3/26/2015 11:15 PM, Brian Denley wrote:
Ken and Don:
I am interested in this as well. My KAT100 is complete in the EC-2 and I just
started the KPA100 build today. I'm sure I have a few spare toroid cores
around here. How do I tell if they are the ones specified by Don?
Brian
KB1VBF
Sent from my iPad
On Mar 26, 2015, at 7:57 AM, Don Wilhelm <[email protected]> wrote:
Ken,
Although *supposedly* the inductor should be able to supply the needed current,
I recommend replacing it with a toroid.
Especially if the inductor is of the older miniature type.
12 turns on a FT25-43 or FT37-43 core will work nicely.
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