[Elecraft] HELP! Permeability of Ferrite Cores...

[AJSOENKE at aol.com]

This site is the manufacturer of the Ferrite materials> They are  responsible 
for a major percentage of the material used by the ferrite core  
manufacturers and retailers.  There are several tutorials on a variety of  lists that 
break down the relation-ship between Fair-Rite and the 2nd party  suppliers. These 
usually describe the disparity in prices and availability  - basic 
wholesale/retail and quantity handling issues. The part numbers you show  are the result 
of the retailers part numbering.  If you know the retailers  part 
number-to-material type
(i.e. I believe the FT37-43) is a toroid size - material type id) the you  
can go to the following web pages and see the material specs for all of  
Fair-Rites sizes in the various materials. 
 
_www.fair-rite.com/_ (http://www.fair-rite.com/)  
 
_http://www.fair-rite.com/cgibin/catalog.pgm#select:freq3_ 
(http://www.fair-rite.com/cgibin/catalog.pgm#select:freq3) 
 
Amidon is a retailer or "value added" supplier. This is their page for the  
FT-37-43
 
_https://www.amidoncorp.com/items/13_ (https://www.amidoncorp.com/items/13) 
 
which indicates the type 43 material in a FT37 size.
 
Also, the ISO standards list will give you other mfg names which may add to  
your list.
 
BTW, I used Google for all this. Having been in the business for many years  
(Computer magnetic components and materials), I  knew of Fair-Rite by name.  I 
searched using the terms  FAIRRITE first and then FT37 TOROID. The word  
TOROID is key to yielding results.
 
Good luck,  Al WA6VNN
 
 
 
In a message dated 9/12/2008 11:16:12 A.M. Pacific Daylight Time,  
dmg at bossig.com writes:
Can nyone provide me with the permeability number for  the T37-2 and the 
FT37-43 cores???

Using Google hasn't got me the  data I need  ;-((


--
Dave G.   KK7SS
'65 MK III  Sprite in Richland, WA

If life begins at 50, why am I falling apart  ?!
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