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How to choose a toroid core and wire size?

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flat5

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I'm planing to build a receiver for 4mhz or 7mhz or 14mhz.
Have not decided yet.
I have not worked with toroids before.
It seems that for 500khz - 30mhz I should use Red E cores.
There are 24 of them to choose from! They all have u = 10.
**broken link removed**
Color me confused :)

How do I choose?

While I'm asking Questions, how do I choose a wire size?

Thank you for any help.
 
Thanks Mikebits. That's a lot to wade through but it's not an easy subject I guess.

Thumb rules would be nice :)
 
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