[RFI] DX Engineering Choke question...

Ron Rossi kk1l at comcast.net
Tue Apr 14 13:34:01 PDT 2009


While we are on the subject of learning...

I was a bit perplexed by something I read in the April 2009 QST "Short
Takes" about the DX Enineering FCC050-H05-A current choke.

The interior looks great having a pair of binocular ferrite chokes with
three turns each. Having built similar chokes myself I know they will
work well. However the perplexing part to me is how does this device
choke current on the shield when the shield is shorted together through
the case? It would seem this is a shunt path around the balun.

The performance was not measured for the review, but it did improve the
RFI situation as the nice construction would lead you do believe, so I
am missing something. What am I missing here?? It must be something obvious.

The article can be read on the member's only site or of course in the
April issue. It is the last page of this link

73 es God Bless de KK1L...Ron Rossi (kk1l at arrl.net) <><
QTH: Jericho, Vermont
My page: http://home.comcast.net/~kk1l

Colman Ahern wrote:
> I've been on this list for some time, read a lot of good and bad 
> advice.  As much good knowledge as one can find is essential for 
> understanding the subject of RFI.  Jim  Brown's "60 + pages" is some of 
> the best I've come across.  Reading the entire article more than once 
> has been really helpful to me.
> RFI seems to have so many ways in which it, in all its forms, invades 
> our lives to the point that there is no one way to cure it.   It has to 
> be understood in all its facets and attacked from as many fronts as 
> possible to effect a cure in many situations.
> That's where reading the 60 pages comes in.
> Colman Ahern,
> Berkeley, Calif.
> On Apr 12, 2009, at 10:33 AM, Peter Laws wrote:
>> But you could excerpt. Or cut/paste.  I'm sure I'm not the only one
>> that is tired of seeing every single question answered with "read the
>> 60+ page pdf at this url".
>> That may be true (and I'm sure it is - I'm about 1/3 of the way in!)
>> but it's not really helpful.
>> On 2009-04-12, Jim Brown <jim at audiosystemsgroup.com> wrote:
>>> On Sat, 11 Apr 2009 22:31:02 -0400, Eric - VE3GSI wrote:
>>>> I only suggest the little Belkin cube as a line filter, if only for
>>>> convenience. NOT for the surge protection!!!! The little one I have, 
>>>> model
>>>> F5C594 has been replaced here:
>>> Eric,
>>> No one is throwing rocks at YOU, but at MOVs. They are VERY 
>>> dangerous, for
>>> several reasons, all of which are documented on my website. Yes, they 
>>> are
>>> widely used. Lots of people smoke tobacco, but that doesn't mean it's 
>>> good
>>> for you. Lots of equipment is built with pin 1 problems, which cause 
>>> hum,
>>> buzz, and RFI. That doesn't make it right. And I'm not going to write 
>>> five
>>> paragraphs here to repeat what I've already put on my website as a 
>>> free
>>> download.
>>> 73,
>>> Jim Brown K9YC
>>> _______________________________________________
>>> RFI mailing list
>>> RFI at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/rfi
>> -- 
>> Sent from my mobile device
>> Peter Laws | N5UWY | plaws plaws net | Travel by Train!
>> _______________________________________________
>> RFI mailing list
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