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Re: Topband: Choke material

To: Mike Waters <>
Subject: Re: Topband: Choke material
From: Guy Olinger K2AV <>
Date: Fri, 8 Sep 2017 20:21:34 -0400
List-post: <>
Those chokes are of a material that is designed for audio frequencies. I
can still remember the day's in my youth when I could hear the 15 kHz
horizontal sweep frequency.

I would not be using those for a frequency more than a hundred times the
frequency they were designed for.

Use the #31 material for 1.8 Mhz.  Go see K9YC's web page to see why.

73, Guy K2AV

On Fri, Sep 8, 2017 at 3:30 PM, Mike Waters <> wrote:

> Yes they are! I have used many of those ferrite cores for that purpose over
> the years. Wind as many turns of coax through them as possible. And make
> sure there is no gap between the halves.
> How they compare to stacked 2.4" 31 material toroids (which is what I've
> used the past few years), I can't say.
> 73, Mike
> On Fri, Sep 8, 2017 at 2:23 PM, Carol Richards <> wrote:
> > I have been cleaning out a shed with 50+ years of stuff. I found several
> > yoke cores from the TV sets made in the 60's. Are they usable for common
> > mode chokes?
> >
> _________________
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