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@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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