Return-Path: Received: from mtain-di03.r1000.mx.aol.com (mtain-di03.r1000.mx.aol.com [172.29.64.7]) by air-dc03.mail.aol.com (v129.4) with ESMTP id MAILINDC033-864f4c4c9689173; Sun, 25 Jul 2010 15:54:49 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-di03.r1000.mx.aol.com (Internet Inbound) with ESMTP id 022B2380000A6; Sun, 25 Jul 2010 15:54:47 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Od7GN-0000nr-C8 for rs_out_1@blacksheep.org; Sun, 25 Jul 2010 20:53:31 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Od7GM-0000ni-JB for rsgb_lf_group@blacksheep.org; Sun, 25 Jul 2010 20:53:30 +0100 Received: from mail-bw0-f43.google.com ([209.85.214.43]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Od7GL-0005pu-6s for rsgb_lf_group@blacksheep.org; Sun, 25 Jul 2010 20:53:30 +0100 Received: by bwz13 with SMTP id 13so2821311bwz.16 for ; Sun, 25 Jul 2010 12:53:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:content-type; bh=moemDHbF8+zYBeBUpjD6DacRA4SVhYBVSW7K2Mxaqdg=; b=BC0kFhnPkpUgtWWquviFkwnYv4WxPfVAeocd5sMDjSWr4P+GyqdIyfi3aP5ub9dTJL booz33ilf36/RB1Hj1i0aVhM0TTwacF/hSrY7FO0XIPeVwO3uMi9ACBkIayfyMWwiUiT lq4Rra8z5oeyKvwmDiPUagTICqFhgoa25r+wI= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=FadvcLpdAI7R7DXa0iwTH3fILbYmyiy2OrvaC1yBpYzgPnM0fWnExUNgV1V25ymzZp ny2z7V/8hRyycAvF1NcN6TxDfrZ65nekjWehAaHVNqf+915Weowc2f3S29fF88w3Qr/U Lc0ZmlfqLszcrUIcbZEI9PzBhgD9SLMP3WStU= MIME-Version: 1.0 Received: by 10.204.35.5 with SMTP id n5mr4735207bkd.155.1280087607656; Sun, 25 Jul 2010 12:53:27 -0700 (PDT) Received: by 10.204.122.148 with HTTP; Sun, 25 Jul 2010 12:53:27 -0700 (PDT) In-Reply-To: References: <002a01cb2c25$ed5da320$0601a8c0@xphd97xgq27nyf> Date: Sun, 25 Jul 2010 20:53:27 +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: Re: LF: Re: 136kHz LPF toroids? Content-Type: multipart/alternative; boundary=0003255590ae22c10c048c3b9f88 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.9 required=5.0 tests=HTML_30_40, HTML_FONTCOLOR_UNSAFE,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-m241.2 ; domain : gmail.com DKIM : pass x-aol-sid: 3039ac1d40074c4c9687531d X-AOL-IP: 193.82.116.20 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) --0003255590ae22c10c048c3b9f88 Content-Type: text/plain; charset=ISO-8859-1 All, Thanks for the good advice already regarding LPF toroids for 136kHz. Sounds like a T68-2 or T157-2 (or something in between) should fit my requirements well. Mal, et al, my ERP is unlikely to exceed a few milliwatts on 136kHz, so don't worry about me putting out too much power :-) Any suggestions on what inductor type to use for receiver input tuned circuit on 136kHz please? 73s Roger G3XBM On 25 July 2010 19:39, Gary - G4WGT wrote: > 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 >> >> > -- http://g3xbm-qrp.blogspot.com/ http://www.g3xbm.co.uk http://www.youtube.com/user/g3xbm G3XBM GQRP 1678 ISWL G11088 --0003255590ae22c10c048c3b9f88 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable All,

Thanks for the good advice already regarding LPF toroids for= 136kHz. Sounds like a T68-2 or T157-2 (or something in between) should fi= t my requirements well. Mal, et al, my ERP is unlikely to exceed a few mil= liwatts on 136kHz, so don't worry about me putting out too much power= :-)

Any suggestions on what inductor type to use for receiver input tuned= circuit on 136kHz please?

73s
Roger G3XBM


On 25 July 2010 19:39, Gary - G4WGT &l= t;g4wgt@tiscali.co.uk> wrote:
Hi Mal,
You wrote :-
The aim on this band=A0is for at least 1W erp

The maximum allowed ERP for this band (136= kHz) 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




--
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
--0003255590ae22c10c048c3b9f88--