this is great info which I really appreciate, Jim
Mouser is probably the closest to my QTH and this url
http://tinyurl.com/yd94aws
shows F-Rite's part numbers for HF or mix 31 toroids.
I have not detailed read that first table to see if they are beads or snap
togethers only but hopefully, they make large donuts for 3 to 5 pass chokes
or whatever they are called. (I am afraid I will never pass my Extra at my
advanced age <G> as I cannot remember the difference between a watt and a
volt much less any other of those arcane things like Z and Q and C and so
on.) But I sure enjoy working with my Army MARS fellows here in Texas.
Although, that TNC thing is giving me a fit... hi hi
Thanks again Jim. and every one else for their efforts to enlighten me.
73
chas, K5DAM
Houston
-------- Original Message --------
Subject: Re: [Amps] Source for large purchase of toroids?
Resent-Date: Tue, 26 Jan 2010 11:16:31 -0500 (EST)
Resent-From: Jim Brown <jim@audiosystemsgroup.com>
Date: Tue, 26 Jan 2010 08:13:21 -0800
From: Jim Brown <jim@audiosystemsgroup.com>
To: amps@contesting.com <amps@contesting.com>
On Mon, 25 Jan 2010 22:58:00 -0600, chas wrote:
>ok, micrometals material codes are completely different from Fair-Rite.
>so, what does Fair-Rite #31 = in MMetals?
>ditto question of F-R #43 = in MMetals??
They are not "different codes." they are VERY DIFFERENT MATERIALS, have
VERY different properties, and used for different purposes. Micrometals
makes powered iron, which are primarily used for inductors. Fair-Rite
makes ferrites, which are used as inductors, transformers, and
suppressors.
Fair-Rite #43 is a pretty generic VHF suppressor material, and several
other companies make equivalents. Fair-Rite #31 is a new mix they
developed about 10 years ago, and as far as I know, hasn't yet been
copied.
>where is the scientific data on their products, etc?
See their website.
It is CRAZY to go to all this trouble to try to find "generic
equivalents" to Fair-Rite parts simply because Amidcon and Palomar are
raping us with their prices. Instead, simply go to industrial
distributors of Fair-Rite parts and buy them at the right prices, not
Amidon or Palomar's inflated prices.
73,
Jim Brown K9YC
--
chasm@texas.net k5dam Houston, TX
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