K2 - Toroids

[Ron McCurdy]

I just wound my first toroid for the K2.  It is supposed to be RFC14,
18microhenries, 10 turns.  I measured the inductance with my LC Meter IIB
and it measures 31 microhenries.  Is this okay?  Should I remove turns until
it is correct???

 

Ron

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[KK7P]

> I just wound my first toroid for the K2.  It is supposed to be RFC14,
> 18microhenries, 10 turns.  I measured the inductance with my LC Meter IIB
> and it measures 31 microhenries.  Is this okay?...

Use the number of turns as your guide.  Measured inductance may vary
depending on the frequency you are exciting the toroid with when
measuring versus the core material of the toroid and the frequency at
which the inductance is specified.

73,

Lyle KK7P

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[Don Wilhelm-4]

Ron,

The most important parameter is the number of turns and the core type.  
The inductance shown in the schematic may not be correct for all cases.  
That particular RFC used to be a molded inductor and was changed to a
toroid, but the schematic was apparently not updated with the new value.
In all cases, the values shown in the text are correct.  In this case it
is the number of turns that are important.

You may update your schematic with your measured value if you wish.

73,
Don W3FPR

Ron McCurdy wrote:

> I just wound my first toroid for the K2.  It is supposed to be RFC14,
> 18microhenries, 10 turns.  I measured the inductance with my LC Meter IIB
> and it measures 31 microhenries.  Is this okay?  Should I remove turns until
> it is correct???
>
>  
>
> Ron
>
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