Return-Path: Received: from mtain-ma06.r1000.mx.aol.com (mtain-ma06.r1000.mx.aol.com [172.29.96.14]) by air-dd01.mail.aol.com (v129.4) with ESMTP id MAILINDD013-86574c4c7b9e65; Sun, 25 Jul 2010 13:59:58 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-ma06.r1000.mx.aol.com (Internet Inbound) with ESMTP id 86710380000B4; Sun, 25 Jul 2010 13:59:56 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Od5TS-00089R-Rf for rs_out_1@blacksheep.org; Sun, 25 Jul 2010 18:58:54 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Od5TS-00089I-EF for rsgb_lf_group@blacksheep.org; Sun, 25 Jul 2010 18:58:54 +0100 Received: from mail-bw0-f43.google.com ([209.85.214.43]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Od5TQ-0004rU-7W for rsgb_lf_group@blacksheep.org; Sun, 25 Jul 2010 18:58:54 +0100 Received: by bwz13 with SMTP id 13so2793606bwz.16 for ; Sun, 25 Jul 2010 10:58:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:date:message-id :subject:from:to:content-type; bh=3dT2FYY15oOn+PVZblOUmVwoox5E24snyCmL14X3BOk=; b=c+Vs7yW2bm1SMoKnBvJTGvLovcODgZBUV0kDCz0LUjQeyrZ0OhCt8Yf9vLJXjLyFS2 m5P+dMeDNXYWhMopbcuyGX9A4hnERRr50scQLo+RUqkA/zMkQXhscqJzoPNB+IuqB3+j pPKyQzXg0Q8Nd3MuMkn6e/2lWqSZ32yGVbDTk= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type; b=xoD3ZJj1MkqPAcK3RxdWp/8BjkK6mOfIE16alD9CKCClS5vyawlUzpX5Cmc369OTTT SPiPaOPwcg6ZpVA410QBE1s4ncAVTC3J3oSdzn92BoaOuSPB/s2dVoVbP8Y+ryVG8XUz Y+P7y1uOtok9n2C5lD3OmAFAmjUSFfzHcY4GI= MIME-Version: 1.0 Received: by 10.204.142.205 with SMTP id r13mr4420973bku.207.1280080731198; Sun, 25 Jul 2010 10:58:51 -0700 (PDT) Received: by 10.204.122.148 with HTTP; Sun, 25 Jul 2010 10:58:51 -0700 (PDT) Date: Sun, 25 Jul 2010 18:58:51 +0100 Message-ID: From: Roger Lapthorn 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: LF: 136kHz LPF toroids? Content-Type: multipart/alternative; boundary=0015174c0bea445609048c3a0523 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=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-d302.2 ; domain : gmail.com DKIM : fail x-aol-sid: 3039ac1d600e4c4c7b9c4c8f X-AOL-IP: 193.82.116.20 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) --0015174c0bea445609048c3a0523 Content-Type: text/plain; charset=ISO-8859-1 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 --0015174c0bea445609048c3a0523 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Some advice please....
  1. I'm about to construct a 136kHz tra= nsverter 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 po= wer level?=A0 Around 54uH is required and this is rather too much for a T5= 0 (red) toroid that I used on 500kHz. I don't want anything too physic= ally large if I can avoid it.
  2. Also, are there any readily available canned inductors (or toroids) su= itable for use as the input tuned circuit on RX? Something like the KANK33= 33 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=A0 =A0 GQRP 1678=A0 =A0 =A0 ISWL G11088
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