On Sat, 28 Mar 2009 17:00:41 -0700, Dan Sawyer wrote:
>43 cores are used in rf power transformers for similar frequency
>ranges.
I don't know what a "red core" is, but I know a lot about the Fair-Rite
#43 material. It has low loss at low frequencies, and high loss at high
frequencies. I would NOT use it where the core needed to carry much
power above a few MHz. How much is "much?" A 2.4-inch #43 is going to
get hot with 100 watts at 14 MHz, and hotter at 28 MHz. Fair-Rite #61 is
a good material for HF transformers in the 100 watt range.
It is quite useful to study the material electrical properties in the
Fair-Rite catalog that is on their website.
73,
Jim Brown K9YC
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