Jim, I think you missed the statement that the cores are 1-1/8" long. This
makes them
equivalent to several of the usual "lifesaver-shaped" ones. The effect is
proportional to
the total length, not the number of cores, since the ferrite particles are
insulated from
each other anyway.
Assuming that the material is appropriate, of course.
Jim Brown wrote:
> On Sat, 25 Apr 2009 21:56:16 +0430, Marv Gonsior wrote:
>
>> Ive noted the thread regarding baluns with interest and I have 5 ferrite
>> cores that are a perfect fit over RG-8 type coax to make a good sleeve
>> balun. They measure 1 1/8 in length, with a 1 o.d. and a « i.d.
>
> You didn't say what ferrite material these are, but this is pretty close
> to what Palomar sells as a "high power current balun." That one is a VERY
> inferior version of W2DU's choke. 5 cores of any material I know of is
> woefully inadequate to provide much choking impedance on the HF bands. If
> it's #31 or #43, it's starting to be useful on 6M.
>
> Yes, I know there's a piece on a choke like this in a recent QST, but the
> only thing good about it is the mechanical construction. The engineering
> is lousy. The technical basis for my statements is in my tutorial.
>
> 73,
>
> Jim Brown K9YC
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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