Toroid identification

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From: Donny Sirait (dsirait@centrin.net.id)
Date: Sun Aug 22 1999 - 23:47:10 EDT


Hi Gang,

I'm reall a dummy in this aspect and simply could not afford to
obtain the needed references here therefore I would appreciate
any help from the talented group.

My question is:
1. What is the difference between iron powdered toroid and a ferite
and it's application (espescially in RF)?
2. How do you identify which is iron powdered and ferite suppose
you were given one?
3. What is the formula to achieve a given inductance on a toroid?
4. I was given several toroids which I intend to use on my radio
project if possible however I cannot identify it any help? The
toroids are taken from a damaged EAS (Electronic Article
Surveilance) power pack supplying 58 KHz burst signals to the
detection pedestals and the dimension is as follows:
Toroid A
Outer diameter: 1.125 inch
Inner diameter: 0.75 inch
Thickness: 0.1875 inch
Width: 0.625 inch
Colour: Before it is coated with grey paint? but then when
I clean it with thinner the original black (greyish) colour were left.
Toroid B
Outer diameter: 0.5 inch
Inner diameter: 0.3125 inch
Thickness: 0.09375 inch
Width: 0.25 inch
Colour: Before it is coated with grey paint? but then when
I clean it with thinner the original black (greyish) colour were left.

The equipment manual does not mentioned the toroid identification just
the inductance value from the wound coil as 330 uH (the small one)
but I forgot the value (it is in the mH range) for the bigger one.

I COULD GIVE MORE DETAILS ON THE ORIGINAL EQUIPMENT
BUT I THINK IT IS NOT ETHICAL TO DISCLOSE COMMERCIAL
INFORMATION, AND I JUST WANT TO MAKE USE HARD TO FIND
ITEMS WHICH OTHERWISE WILL BE USELESS.

Any replies will be appreciated either through the list or direct to
yb6ld@arrl.net.

vy 73 es gl de YB6LD/1 Donny qrp-l #2004


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