Re: [IRCA] Cable connectors

[Russ Edmunds <wb2bjh@xxxxxxxxx>]

My only contribution to this discussion is to say that I've tried RS clamp-on ferrite chokes in multiple applications from coax shielding for antennas to shielding the cables for the old CRT's for the computer, and never found that they did anything.


Russ Edmunds
Blue Bell, PA ( 360' ASL )
[15 mi NNW of Philadelphia]
40:08:45N; 75:16:04W, Grid FN20id
<wb2bjh@xxxxxxxxx>
FM: Yamaha T-80 & Onkyo T-450RDS w/ APS9B @15'
AM: Modified Sony ICF 2010 barefoot


--- On Mon, 9/6/10, Chuck Hutton <charlesh3@xxxxxxx> wrote:

> From: Chuck Hutton <charlesh3@xxxxxxx>
> Subject: Re: [IRCA] Cable connectors
> To: irca@xxxxxxxxxxxxxxxx
> Date: Monday, September 6, 2010, 2:36 PM
> 
> Rick - 
>  
> I liked your explanation except for the part below.
> Considering the choke impedance to be part of a voltage
> divider along with the ground resistance, you surely need a
> choke with at least several thousand Ohms of impedance. With
> a poor ground connection (sandy soil), you can need even
> more. I won't bore everyone with the explanation. 
>  
> Bottom line: I don't think you can ever get even close to
> that with the over-the-cable chokes. I can recommend only
> the chokes made with mini-coax and high permeability (at
> least 2000) material.
>  
>  
> Chuck
>  
> > From: k9ao@xxxxxxxxxxx
> > To: irca@xxxxxxxxxxxxxxxx
> > Date: Mon, 6 Sep 2010 13:20:37 -0400
> > Subject: Re: [IRCA] Cable connectors
> > 
> > 
> > Mark,
> >  (CLIP)
>  Too little added impedance and the effects 
> > aren't all they should be. Usually, paying attention
> to the core material for 
> > the band in question, and getting large enough
> over-the-cable tubular chokes, 
> > or winding an appropriate number of turns of cable
> through a toroid core, will 
> > do the trick.
> > (CLIP)
> > 
> > Rick Kunath
> > _______________________________________________
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>     
>         
>           
>   
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> 


      

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