---- Original Message ----
From: Lehanover@aol.com
To: flyrotary@lancaironline.net
Subject: [FlyRotary] Re: wire routing
Date: Sun, 4 Feb 2007 01:09:03 EST

>
>In a message dated 2/3/2007 11:56:08 P.M. Eastern Standard Time,  
>jwvoto@itlnet.net writes:
>
>Am I wrong, I believe that aluminum will not  shield magnetic flux,
>giving
>only electrostatic shielding; only steel will  shield magnetic flux.
>
>Wendell
>
>
>
>Notice that your IF cans have aluminum all around?  Never seen an IF
>can?
>
>In the olden days radios had big vacuum tubes, and open core
>capacitors to  
>adjust tank circuits and control frequencies. The Inter-frequency
>transformers
>had to be shielded to control phasing and awful noise in the  output.
>Thus
>the aluminum can shielding. Good for wave guides as well.
>
>Ferris metals concentrate flux fields (conduct flux lines well) and
>are  used
>in the cores of transformers and solenoids.  
>
>Lynn E. Hanover

Why are transformers made with ferris metal?  If you want to contain
all the magnetic flux, I still content that steel or mu metal is the
way to go. I have never seen an aluminum magnet.
Wendell