Re: Current Limiting and Impedence

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Paul B. Brodie" <pbbrodie@xxxxxxxxxxxxx>

Robert,
I have had some luck crushing the larger ferrites using a small sledge 
hammer with the ferrites in a canvas bag. This way, I at least have smaller 
pieces to work with for less gaps. It's awfully hard on the canvas but the 
ferrite is pretty fragile considering how hard it is but then you can break 
diamonds with a sharp blow. My Grandmother had a 4 carat diamond engagement 
ring many years ago. She was in a severe car accident and they found her 
diamond in two pieces from where her hand had slammed against the car door. 
She had one piece re-faceted into a new ring but I think it was just a 
little over 1.5 carats. I don't know what happened to the other piece. 
Oops, I seem to have slipped off topic.
Paul
Think Positive

----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Sunday, May 15, 2005 1:14 PM
Subject: Re: Current Limiting and Impedence

> Original poster: robert heidlebaugh <rheidlebaugh@xxxxxxxxxxxxxx>
>
> Paul: I have used cores like you have just stacked insite thin PVC pipe
> clamped tight , and glued into a rod with fiber glass resin to make ferrite
> antenna rods 1 meter long good to over 30 Mhz. The trick is to stack them
> tight with little or no air gap. Dont try to grind them. Ive tried that.
> They just kill your grinder with all the ceramic binder in them. Yes I have
> the tools to grind then, Im an assayer and I grind rocks, but cores are
> tough to grind and eat equipment.
>     Robert   H
> --
>
>
> > From: "Tesla list" <tesla@xxxxxxxxxx>
> > Date: Fri, 13 May 2005 11:53:35 -0600
> > To: tesla@xxxxxxxxxx
> > Subject: Re: Current Limiting and Impedence
> > Resent-From: tesla@xxxxxxxxxx
> > Resent-Date: Fri, 13 May 2005 11:59:21 -0600 (MDT)
> >
> > Original poster: "Paul B. Brodie" <pbbrodie@xxxxxxxxxxxxx>
> >
> > Malcolm,
> > You mention N27 ferrites but the ferrites I have access to are surplus and
> > completely unmarked and of unknown origin. The good thing is that I have a
> > bucketload of them that have accumulated from various sources over many
> > years. I believe that most of them are ferrite beads that were on power
> > cords. Would these work in use as you suggested, crushed up in a PVC tube?
> > I like this idea as I have ready access to so many ferrite beads. Since it
> > sounds so good, I just know you are going to tell me that they are
> > completely different from the ferrite used for toroids and 
transformers and
> > therefore useless for this application. {:-(
> > Regards.
> > Paul
> > Think Positive
> >
...