Return-Path: Received: from mtain-db04.r1000.mx.aol.com (mtain-db04.r1000.mx.aol.com [172.29.64.88]) by air-dd04.mail.aol.com (v129.4) with ESMTP id MAILINDD041-860a4c4c8523185; Sun, 25 Jul 2010 14:40:35 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-db04.r1000.mx.aol.com (Internet Inbound) with ESMTP id 90B0038000054; Sun, 25 Jul 2010 14:40:33 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Od66Y-0000BH-21 for rs_out_1@blacksheep.org; Sun, 25 Jul 2010 19:39:18 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Od66X-0000B8-I7 for rsgb_lf_group@blacksheep.org; Sun, 25 Jul 2010 19:39:17 +0100 Received: from mail-ww0-f47.google.com ([74.125.82.47]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Od66W-0005Dg-1O for rsgb_lf_group@blacksheep.org; Sun, 25 Jul 2010 19:39:17 +0100 Received: by wwb34 with SMTP id 34so2468414wwb.28 for ; Sun, 25 Jul 2010 11:39:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:sender:received :in-reply-to:references:date:x-google-sender-auth:message-id:subject :from:to:content-type; bh=mgfoHiIkbXcp5WUKeA4M87TUGB8XCn/reM1yFQzn5FE=; b=BYzB3yM16+NOAEb5XvG91DrKSwBiS1129LM+u9pX0DWOcdsssFZowdW2qTRLYsd81P yhxXvRwZau8iDnYZuizLupsWbUZ7Olr+xlcMY6b8JvBTMcL6krhPF74II7kGITwBmf1X sT+QR66JPcjweKaH+Dw58iq4CxTSpuWCJVXTs= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:content-type; b=qcczC3IS6IcA8mHIeGsvpxX5T7i5T76LgBuLMrXxdmo9IMcc0A0PPq6OOPjNj5jr/d BwJUib6xobdgLC0ya4RuQj69zCXuZVeR5nwGO1Y/IL0TPTqZKirJrHi2Bedom0wtePCs TxwIyVtnD1j6YYobjIwh4reK9JzkKuTqthSKs= MIME-Version: 1.0 Received: by 10.227.141.138 with SMTP id m10mr6302824wbu.20.1280083150224; Sun, 25 Jul 2010 11:39:10 -0700 (PDT) Received: by 10.216.158.67 with HTTP; Sun, 25 Jul 2010 11:39:10 -0700 (PDT) In-Reply-To: <002a01cb2c25$ed5da320$0601a8c0@xphd97xgq27nyf> References: <002a01cb2c25$ed5da320$0601a8c0@xphd97xgq27nyf> Date: Sun, 25 Jul 2010 19:39:10 +0100 X-Google-Sender-Auth: d_roKAIesnubWC4wcNfPqgX0ICo Message-ID: From: Gary - G4WGT To: rsgb_lf_group@blacksheep.org DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: Re: LF: Re: 136kHz LPF toroids? Content-Type: multipart/alternative; boundary=001485f276a073be42048c3a95f4 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-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-d305.1 ; domain : gmail.com DKIM : fail x-aol-sid: 3039ac1d40584c4c85211b12 X-AOL-IP: 193.82.116.20 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) --001485f276a073be42048c3a95f4 Content-Type: text/plain; charset=ISO-8859-1 Hi Mal, You wrote :- The aim on this band is for at least 1W erp The maximum allowed ERP for this band (136kHz) is 1 watt ERP. 73 Gary - G4WGT. On 25 July 2010 19:19, mal hamilton wrote: > 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 > > > ----- Original Message ----- > *From:* Roger Lapthorn > *To:* rsgb_lf_group@blacksheep.org > *Sent:* Sunday, July 25, 2010 6:58 PM > *Subject:* LF: 136kHz LPF toroids? > > Some advice please.... > > 1. I'm about to construct a 136kHz transverter with an output power 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 used on 500kHz. I > don't want anything too physically large if I can avoid it. > 2. Also, are there any readily available canned inductors (or toroids) > suitable for use as the input tuned circuit on RX? Something like the > KANK3333 inductors from Toko? Again, nothing too big unless this is a > necessity for large signal handling. > > Thanks in advance for inputs. > > 73s > Roger G3XBM > > -- > http://g3xbm-qrp.blogspot.com/ > http://www.g3xbm.co.uk > http://www.youtube.com/user/g3xbm > G3XBM GQRP 1678 ISWL G11088 > > --001485f276a073be42048c3a95f4 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Hi Mal,

You wrote :-
The aim on this band=A0is for at= least 1W erp

The maximum allowed= ERP for this band (136kHz) is 1 watt ERP.

73

Gary - G4WGT.


On 25 July 2010 19:19, mal hamilton <g3kevmal@talktalk.net> wrote:
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=A0is for at leas= t 1W=20 erp
de mal/g3kev
=A0
----- Original Message -----
Sent: Sunday, July 25, 2010 6:58= PM
Subject: LF: 136kHz LPF toroids?

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?=A0 Around 54uH is requi= red=20 and this is rather too much for a T50 (red) toroid that I used on 500k= Hz. 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 to= roids)=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.blogsp= ot.com/
http:/= /www.g3xbm.co.uk
http://www= .youtube.com/user/g3xbm
G3XBM=A0=20 =A0 GQRP 1678=A0 =A0 =A0 ISWL G11088

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