[Amps] construct ferrite "line isolator"

[Jeff Blaine]

Read this.

http://www.audiosystemsgroup.com/CoaxChokesPPT.pdf

Good luck!

73, Jeff ACØC
www.ac0c.com
-----Original Message----- 
From: tzikas tzik
Sent: Tuesday, October 26, 2010 11:28 AM
To: Carl
Cc: amps at contesting.com
Subject: Re: [Amps] construct ferrite "line isolator"

thank you very much!
so material #43 ferrite is improper? i have not other material.

On Tue, Oct 26, 2010 at 6:44 PM, Carl <km1h at jeremy.mv.com> wrote:

> Ive used ferrites here for all sorts of RFI problems over the past 30 years
> or so; speaker leads, keyboards, monitors, telephones, touch and CFL lamps,
> common mode chokes on both ends of feedlines, auto ignitions, TV and VCR,
> and many other items. They always do the job as long as the right ferrite
> mix is used.
>
> Powdered iron is fine for tuned circuits and high power HF baluns where low
> loss is needed. Even Sevik woke up to that fact.
>
> Carl
> KM1H
>
>
>
> ----- Original Message -----
> From: "DAVE WHITE" <mausoptik at btinternet.com>
> To: <amps at contesting.com>; <dezrat1242 at yahoo.com>
> Sent: Tuesday, October 26, 2010 2:39 AM
> Subject: Re: [Amps] construct ferrite "line isolator"
>
>
> Interesting. So I guess the question is "why?"
>
> Why would powdered metal work better? Is it more lossy at HF?
>
> cheers
>
> Dave G0OIL
>
> For what it's worth - I have found ferrites to be all but useless at HF
> for preventing RFI, even when used in large numbers. I have had much
> better success with powdered iron toroids.
>
> 73, Bill W6WRT
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