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?
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