[Elecraft] rf torroid

[ham_tech@juno.com]

Thanks to Stuart and John,

for the answers...

On Mon, 3 Jun 2002 16:32:28 -0500 "Stuart Rohre" <rohre@arlut.utexas.edu>
writes:
> Daniel and the group:  There is not standardization among various
> manufacturers of toroid cores as to color vs. frequency.  While 
> Micro Metals
> cores do have red as an RF core, they also have yellow and others.  
> You have
> to measure unknown cores as they might be ferrite or iron dust core, 
> and no
> maker stamps their name upon the core, although that seems easy 
> enough to
> do.  Thus, if you get cores from surplus that have never been used 
> retain
> packaging to help identify them.  IF taking a core out of a circuit, 
> perhaps
> you will know what frequency range by the original application.  
> Measurement
> on an inductance test setup with a few test turns on the core, is 
> the only
> way to know for sure.
> 73,
> Stuart K5KVH
> 
> 
>