[TowerTalk] Cores

[Steve Hunt]

The #2631803802 part (FT240-31 for shorthand) is classified by Fair-Rite 
as a "Round Cable EMI Suppression Core", for which they have a single 
generic drawing which is "long and thin" whatever the physical 
dimensions. You can be confident that part is 2.4"/1.4"/0.5" 
(OD/ID/Height) despite the pictures!

Steve G3TXQ




On 08/07/2014 18:45, larryjspammenot at teleport.com wrote:
> One thing I've noticed about the companies selling the #31 ferrite cores is that the pictures shown in their on-line catalogs appear to be showing a tall, slender core, which looks like the ones that are used on PC video monitors, etc. - just maybe big enough for one coax cable to go through.  The ones in Jim's presentations look like they're short, wide cores, that about 4 turns of RG-8 sized coax can go through. Are the catalog suppliers just using some "Generic" core picture in their listing? The two types don't look similar at all in the pictures. I've been hesitant to order any until I see cores that look like the ones in Jim's articles.
> LJ
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