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PICList Thread
'OT: RF COILS'
1998\07\01@181251 by Felix Centeno

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How I now the kind of coil or the manufacturer of it , if on
the metal can of the coil there are only a number li this:
C104 --> red center
P506 --> black center
SH102 --> white center

I'm going to try to use this coils that have in a old wireless
Phone card.

Thanks


Felix Centeno
spam_OUTcentellaTakeThisOuTspamtelcel.net.ve
http://www.geocities.com/CapeCanaveral/Hangar/2372/

1998\07\02@115614 by Peter L. Peres

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On Wed, 1 Jul 1998, Felix Centeno wrote:

> How I now the kind of coil or the manufacturer of it , if on
> the metal can of the coil there are only a number li this:
> C104 --> red center
> P506 --> black center
> SH102 --> white center

These are usually made by Apollo, Toko or Coilcraft (less likely). A
catalog from the manufacturer will tell you what each coil is.

There is no rule of thumb, but many coils are marked in the same manner as
3-letter capacitor codes, in nanoHenry, i.e. C104 could be 1 x 10 E 4 [nH]
== 10 [uH]. The letters encode the ferrite type, case type etc. and there
is no rule for them. Also, this does not always specify the existing
windings. Screw-in ferrites are sometimes encoded by color, but mostly the
color specifies the coil type in a family (i.e. LO, IF1, IF2 etc in a
superhet coil set). In this line of thought, red is LO (1000-2600 kHz),
black is IF2 (or detector) (455 kHz) and white is IF2 in FM band (10.7
MHz) (if used). Also orange = IF1 (10.7 MHz) and pink green and white are
discriminator coils (also 10.7 MHz FM). Even so, colors vary from
manufacturer to manufacturer. In a wireless phone the meaning of the
colors would change, although I suppose that the engineers who designed
it tried hard to use available parts ;).

If you have a new design in mind, order a sample design kit of coils, for
example from Coilcraft (http://www.coilcraft.com). These are well worth
the money, last you a long time, and you can obtain the catalog with them,
after which you can order what you want. (I do no speak for Coilcraft)

There are other suppliers out there.

hope this helps,

       Peter

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