Been using a few for a couple of years. In my case, I used them on an air
conditioner that has a molded on GFI plug that can't be removed, so it fits
through the middle
--
73 de KG2V
Charlie
> On Mar 28, 2017, at 12:00 PM, Jim Thomson <jim.thom@telus.net> wrote:
>
> Date: Sun, 26 Mar 2017 16:22:58 -0700
> From: Jim Brown <jim@audiosystemsgroup.com>
> To: Rfi List <rfi@contesting.com>, towertalk reflector
> <towertalk@contesting.com>
> Subject: [TowerTalk] New Larger Fair-Rite #31 Toroid
>
> KY8D asked me about a new, larger #31 toroid that has recently been
> added to the catalog. It's 4-in o.d., 3-in i.d, and 1-inch long.
>
> http://www.fair-rite.com/product/round-cable-emi-suppression-cores-2631814002/
>
> Note the impedance data for 1, 3, and 5 turns at the bottom of the page.
>
> Gan's email arrived today (Sunday) so I haven't had the opportunity yet
> to investigate pricing. My guess is at least double the cost of the
> 2.4-in toroid, but because it's twice the length (1-in as opposed to
> 0.5-in for the 2.4-in toroid), a single core will likely be equivalent
> to two of the 2.4-in cores, so fewer cores will be required to achieve
> the same choking Z. More important, the much larger i.d. will allow more
> turns and/or larger coax.
>
> 73, Jim K9YC
>
> ## I saw the new 4 inch OD x 3 inch ID x 1 inch long type 31 torroid on
> their
> site over a year ago, I believe its been there for quite some time. If you
> look at the
> impedance data for 1,3,5 turns, at various freqs, you will see that the new
> bigger torroid
> has just a hair higher results when you rapidly toggle between the 2 x
> cores. Unless you are
> hell bent trying to stuff more than 7 turns of RG-393 or RG-213 through a
> torroid, IMO, the
> bigger 4 inch OD torroid really buys you nothing..and its twice the length to
> boot. Its also 2.5
> x heavier. 420g vs 117g.
>
> ## Danny, E73M, and myself looked at the new 4 inch OD torroid, and
> discarded it soon after.
> The ID is simply too big, being a whopping 3 inch ID, so even though its
> twice the length of the
> smaller 2.4 inch OD x 1.4 inch ID, it buys you nothing when you measure both
> of the torroids,
> with 1-7 turns of 393 or 213 . The smaller torrid is only half the
> length, and works 99% as good.
> If you say had a requirement for 6 x 2.4 inch cores... = 3 inches long.....
> you would require 5 x 4.0
> inch cores to do the same thing..... = 5 inches long.
>
> ## The bigger 4 inch core would be ideal if trying to wind flexible power
> cable around it..or something
> like LMR-600UF etc.
>
> Jim VE7RF
>
>
>
>
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