[RFI] New Larger Fair-Rite #31 Toroid

[Jim Brown]

Optimum depends on the frequency and the diameter of the coax. Like I 
said in the post below, I would expect this new core to be roughly 
equivalent to two of the 2.4-in diameter cores.

73, Jim K9YC

On Sun,3/26/2017 5:17 PM, Dave Cole wrote:
> Jim,
> What would you estimate the optimal number of turns to be for this 
> ferrite?
>
> 73s and thanks,
> Dave
> NK7Z
> http://www.nk7z.net
>
> On 03/26/2017 04:22 PM, Jim Brown wrote:
>> 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
>>
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