Return-Path: Received: from mtain-mj10.r1000.mx.aol.com (mtain-mj10.r1000.mail.aol.com [172.21.164.94]) by air-db05.mail.aol.com (v129.4) with ESMTP id MAILINDB053-86474c4c80911c8; Sun, 25 Jul 2010 14:21:05 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-mj10.r1000.mx.aol.com (Internet Inbound) with ESMTP id E93E4380000E2; Sun, 25 Jul 2010 14:21:03 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Od5nd-0008HT-61 for rs_out_1@blacksheep.org; Sun, 25 Jul 2010 19:19:45 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Od5nc-0008HK-Cl for rsgb_lf_group@blacksheep.org; Sun, 25 Jul 2010 19:19:44 +0100 Received: from out1.ip05ir2.opaltelecom.net ([62.24.128.241]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Od5nb-00050P-5O for rsgb_lf_group@blacksheep.org; Sun, 25 Jul 2010 19:19:44 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: As8GAC4dTExOk8Ki/2dsb2JhbACPQwODUYxHcb50hTYEizA X-IronPort-AV: E=Sophos;i="4.55,258,1278284400"; d="scan'208,217";a="306949727" Received: from unknown (HELO xphd97xgq27nyf) ([78.147.194.162]) by out1.ip05ir2.opaltelecom.net with SMTP; 25 Jul 2010 19:19:35 +0100 Message-ID: <002a01cb2c25$ed5da320$0601a8c0@xphd97xgq27nyf> From: "mal hamilton" To: References: Date: Sun, 25 Jul 2010 19:19:31 +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: 136kHz LPF toroids? Content-Type: multipart/alternative; boundary="----=_NextPart_000_0027_01CB2C2E.4EEFFEA0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_30_40,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: 3039400c89b44c4c808f1571 X-AOL-IP: 193.82.116.20 X-AOL-SPF: domain : blacksheep.org SPF : none ------=_NextPart_000_0027_01CB2C2E.4EEFFEA0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Roger A T- 200 is ideal but maybe too large for u. Except you have a large= antenna 20w is not enough on 137 for any serious impact. The aim on this band is for at least 1W erp de mal/g3kev =20 ----- Original Message -----=20 From: Roger Lapthorn=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Sunday, July 25, 2010 6:58 PM Subject: LF: 136kHz LPF toroids? Some advice please....=20 1.. I'm about to construct a 136kHz transverter with an output pow= er up to 20W. What's the best choice of toroid for the TX output low= pass filter inductors for this sort of power level? Around 54uH is= required and this is rather too much for a T50 (red) toroid that I us= ed on 500kHz. I don't want anything too physically large if I can avoi= d it.=20 2.. Also, are there any readily available canned inductors (or tor= oids) suitable for use as the input tuned circuit on RX? Something lik= e the KANK3333 inductors from Toko? Again, nothing too big unless this= is a necessity for large signal handling.=20 Thanks in advance for inputs. 73s Roger G3XBM --=20 http://g3xbm-qrp.blogspot.com/ http://www.g3xbm.co.uk http://www.youtube.com/user/g3xbm G3XBM GQRP 1678 ISWL G11088 ------=_NextPart_000_0027_01CB2C2E.4EEFFEA0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Roger
A T- 200 is ideal but maybe too large= for u. Except=20 you have a large antenna 20w is not enough on 137 for any serious=20 impact.
The aim on this band is for at= least 1W=20 erp
de mal/g3kev
 
----- Original Message -----
Sent: Sunday, July 25, 2010= 6:58 PM
Subject: LF: 136kHz LPF toroi= ds?

Some advice please....
  1. I'm about to construct a 136kHz transverter with an output pow= er up to=20 20W. What's the best choice of toroid for the TX output low= pass=20 filter inductors for this sort of power level?  Around 54uH= is required=20 and this is rather too much for a T50 (red) toroid that I used on= 500kHz. I=20 don't want anything too physically large if I can avoid it.=20
  2. Also, are there any readily available canned inductors (or tor= oids)=20 suitable for use as the input tuned circuit on RX? Something like= the=20 KANK3333 inductors from Toko? Again, nothing too big unless this= is a=20 necessity for large signal handling.
Thanks in advance= for=20 inputs.

73s
Roger G3XBM

--
http://g3xbm-qrp.blogspot.com= /
http://www.g3xbm.co.uk=
http://www.y= outube.com/user/g3xbm
G3XBM =20   GQRP 1678      ISWL G11088
------=_NextPart_000_0027_01CB2C2E.4EEFFEA0--