Return-Path: Received: from mtain-mc07.r1000.mx.aol.com (mtain-mc07.r1000.mx.aol.com [172.29.96.79]) by air-da07.mail.aol.com (v129.4) with ESMTP id MAILINDA074-86674c40af2e1ce; Fri, 16 Jul 2010 15:12:46 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-mc07.r1000.mx.aol.com (Internet Inbound) with ESMTP id 41079380007F9; Fri, 16 Jul 2010 15:12:45 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OZqK4-0003eq-59 for rs_out_1@blacksheep.org; Fri, 16 Jul 2010 20:11:48 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OZqK2-0003eh-R5 for rsgb_lf_group@blacksheep.org; Fri, 16 Jul 2010 20:11:46 +0100 Received: from out1.ip04ir2.opaltelecom.net ([62.24.128.240]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1OZqJz-0007An-UE for rsgb_lf_group@blacksheep.org; Fri, 16 Jul 2010 20:11:46 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Av0EAKJLQExOk88g/2dsb2JhbACPZQOQBHHADYUkBIsQ X-IronPort-AV: E=Sophos;i="4.55,215,1278284400"; d="scan'208,217";a="297640821" Received: from unknown (HELO xphd97xgq27nyf) ([78.147.207.32]) by out1.ip04ir2.opaltelecom.net with SMTP; 16 Jul 2010 20:11:38 +0100 Message-ID: <003f01cb251a$b6a11ae0$0401a8c0@xphd97xgq27nyf> From: "mal hamilton" To: References: Date: Fri, 16 Jul 2010 20:11:37 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: LF: Re: Re: Torroids Content-Type: multipart/alternative; boundary="----=_NextPart_000_003C_01CB2523.1835E760" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_40_50,HTML_MESSAGE autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false x-aol-global-disposition: G x-aol-sid: 3039ac1d604f4c40af2d506b X-AOL-IP: 193.82.116.20 X-AOL-SPF: domain : blacksheep.org SPF : none ------=_NextPart_000_003C_01CB2523.1835E760 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable On a recent trip to GI3/N Ireland I got several nice LOPT transformers= complete with coils, ideal for the Dreamers band. These transformers rewound for 137 and 500 work well and run COLD up= to a few hundred watts.=20 There were millions of these around some years ago and found in old tu= be TV'S. The more recent ones in transistor TV'S are no good for Dream= ers but the cores would probably be suitable with the old coils stripp= ed off and rewound for 136 and 500 but they are not as sturdy as the= old ones, maybe alright for qrp. de mal/gekev ----- Original Message -----=20 From: GROUPS M0=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Friday, July 16, 2010 11:03 AM Subject: LF: Re: Torroids Hi Chris, =20 The references 3C85 and 3C90 specify only the material grade but no= the shape and size of the toroid. =20 We are more familiar with Amidon based references such as FT-50-43= that specifies a ferrite toroidal ring core, grade 43 and 0.5"x0.281"= x0.181" in size. =20 =20 The 3C90 grade comes from Ferroxcube; it is a Manganese-zinc (MnZn)= ferrite for applications below 100 KHz appropriate for high-level dri= ve transformers. =20 73s. =20 Juan, M0WWA ----- Original Message -----=20 From: Chris=20 To: RSGB LF Group=20 Sent: Thursday, July 15, 2010 4:47 PM Subject: LF: Torroids Hi again Juan, Sadly after an exchange of e-mails, that website you gave me canno= t supply the correct type of torroids. They say I need type 78 (for 3C= 85 or 3C90 equivalent) and they don't do them. I wish they'd all stick to the same format for identification of= the various types. Thanks for trying! Chris, G4AYT. ------=_NextPart_000_003C_01CB2523.1835E760 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
On a recent trip to GI3/N Ireland I= got several=20 nice LOPT transformers complete with coils, ideal for the Dreamers=20 band.
These transformers rewound for 137 an= d 500 work=20 well and run COLD up to a few hundred watts.
There were millions of these around= some years ago=20 and found in old tube TV'S. The more recent ones in transistor TV'S ar= e no good=20 for Dreamers but the cores would probably be suitable with the old coi= ls=20 stripped off and rewound for 136 and 500 but they are not as sturdy as= the old=20 ones, maybe alright for qrp.
de mal/gekev
 
 
----- Original Message -----
From:=20 GRO= UPS M0=20
Sent: Friday, July 16, 2010= 11:03=20 AM
Subject: LF: Re: Torroids

Hi Chris,

 

The references 3C85 and= 3C90 specify=20 only the material grade but no the shape and size of the toroid.

 

We are more familiar with= Amidon based=20 references such as FT-50-43 that specifies a ferrite toroidal ring= core, grade=20 43 and 0.5=94x0.281=94x0.181=94 in size.

 

 

The 3C90 grade comes from= Ferroxcube;=20 it is a Manganese-zinc=20 (MnZn) ferrite for applications below 100 KHz appropriate for= =20 high-level drive transformers.

 

73s.

 

Juan, M0WWA

 

----- Original Message -----
From:=20 Chris
Sent: Thursday, July 15, 20= 10 4:47=20 PM
Subject: LF: Torroids

Hi again Juan,
Sadly after an exchange of e-mail= s, that=20 website you gave me cannot supply the correct type of to= rroids.=20 They say I need type 78 (for 3C85 or 3C90 equivalent) and they don= 't do=20 them.
I wish they'd all stick to the sa= me format for=20 identification of the various types.
Thanks for trying!
Chris,=20 G4AYT.
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