[Elecraft] OT: Ferrite Identification Question

[Jim Brown]

Ferrites are not easily identified. From this links on this page you can 
see all of those made by Fair-Rite.

http://www.fair-rite.com/newfair/materials.htm

See my tutorial for a discussion of the use of ferrites for suppression, 
which is what we are doing with chokes.

k9yc.com/RFI-Ham.pdf

To make use of Tom's advice, you'll need to match your measurements with 
a product data sheet.  To find the data sheet, click on "Suppression" in 
this link.

http://www.fair-rite.com/cgibin/catalog.pgm

Most clamp-on ferrite parts you are likely to run into in the surplus 
market have a good chance of being Fair-Rite #43 or something similar to 
#43 by another company.  Fair-Rite's #31 material is a relatively unique 
material, and targeted to suppression at MF and HF. MF is 300 kHz to 3 
MHz, HF is 3 MHz to 30 MHz.

73, Jim K9YC

http://www.fair-rite.com/newfair/materials.htm

On Thu,6/4/2015 9:32 AM, James Bennett wrote:
> A bit off-thread, but sorta related, as these things ARE used for antennas with my K3/KX3!! I have a bunch of ferrites - donuts, clamp-ons, beads, etc. that I’m trying to identify the mix. With the guidance of Tom/W8JI I’ve figured out how to use my AIM-4170C analyzer to show at what frequency these things have an R=X value with Q=1. However, I’ve not been successful relating that frequency data to the mix number. An email to Fair Rite has gone unanswered, and trying to wade through their web site is mind-boggling. Does anyone on this list have a URL that points to this information?