X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 1 [X] Return-Path: Received: from imo-m26.mx.aol.com ([64.12.137.7] verified) by logan.com (CommuniGate Pro SMTP 5.1.5) with ESMTP id 1809977 for flyrotary@lancaironline.net; Sun, 04 Feb 2007 01:10:04 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.7; envelope-from=Lehanover@aol.com Received: from Lehanover@aol.com by imo-m26.mx.aol.com (mail_out_v38_r7.6.) id q.bda.e7d2152 (39329) for ; Sun, 4 Feb 2007 01:09:05 -0500 (EST) From: Lehanover@aol.com Message-ID: Date: Sun, 4 Feb 2007 01:09:03 EST Subject: Re: [FlyRotary] Re: wire routing To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1170569343" X-Mailer: 9.0 Security Edition for Windows sub 5359 X-Spam-Flag: NO -------------------------------1170569343 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit 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 -------------------------------1170569343 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 2/3/2007 11:56:08 P.M. Eastern Standard Time,=20 jwvoto@itlnet.net writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D3>

Am I wrong, I believe that aluminum wi= ll not=20 shield magnetic flux, giving only electrostatic shielding; only steel will= =20 shield magnetic flux.

Wendell

Notice that your IF cans have aluminum all around? Never seen an=20= IF=20 can?

In the olden days radios had big vacuum tubes, and open core capacitors= to=20 adjust tank circuits and control frequencies. The Inter-frequency=20 transformers had to be shielded to control phasing and awful noise in=20= the=20 output. Thus the aluminum can shielding. Good for wave guides as well.

Ferris metals concentrate flux fields (conduct flux lines well) and are= =20 used in the cores of transformers and solenoids.

Lynn E. Hanover

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