Return-Path: Received: from mtain-mg05.r1000.mx.aol.com (mtain-mg05.r1000.mx.aol.com [172.29.96.205]) by air-md01.mail.aol.com (v129.4) with ESMTP id MAILINMD011-8b744c4ca2ab5c; Sun, 25 Jul 2010 16:46:35 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-mg05.r1000.mx.aol.com (Internet Inbound) with ESMTP id DD7813800012E; Sun, 25 Jul 2010 16:46:33 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Od84j-0001Ha-OJ for rs_out_1@blacksheep.org; Sun, 25 Jul 2010 21:45:33 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Od84j-0001HR-4H for rsgb_lf_group@blacksheep.org; Sun, 25 Jul 2010 21:45:33 +0100 Received: from mail-bw0-f43.google.com ([209.85.214.43]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Od84h-0006Df-EN for rsgb_lf_group@blacksheep.org; Sun, 25 Jul 2010 21:45:33 +0100 Received: by bwz13 with SMTP id 13so2833892bwz.16 for ; Sun, 25 Jul 2010 13:45:30 -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=A3O0zm1hQeKtag8ozL4c6nFcwyjli8wpJCwCPqCDa5w=; b=TTLOxEZbtPmdktTH+S7Yk8h66P+73dHB5/9i42LgUgG6vguGTYOUhzKWMmsLp5LDje 3EiUqbO4qy4sh0tQEjiKfsq7zRI6OklhkUCjkDxOkPcXxzqlf8NNBAM0EgSpDhM0a96P rI+Ti1tTF/f7FzIP6Q/jko0NrsfsoBrGSVxSY= 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=XeZOpConj64WVqG+62rBCXeThNDr4CqguQtqgwRcCe0aZQWiroRlRB5mV4fbZTVQiq cHo6gJ3LP6DW0zZoYW6tFl+qSwNR7E7SQefNP328UpSOUioYJmkUnvFFBq3joxVUMm7F A0g5yIxDrkD1hjkRUnKkSRZ696DOcF60iTSL0= MIME-Version: 1.0 Received: by 10.204.7.141 with SMTP id d13mr4727404bkd.158.1280090730512; Sun, 25 Jul 2010 13:45:30 -0700 (PDT) Received: by 10.204.122.148 with HTTP; Sun, 25 Jul 2010 13:45:30 -0700 (PDT) In-Reply-To: <4C4CA000.2080303@iup.uni-heidelberg.de> References: <002a01cb2c25$ed5da320$0601a8c0@xphd97xgq27nyf> <4C4CA000.2080303@iup.uni-heidelberg.de> Date: Sun, 25 Jul 2010 21:45:30 +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=00151758a55e45c242048c3c590e 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-d245.2 ; domain : gmail.com DKIM : pass x-aol-sid: 3039ac1d60cd4c4ca2a932b4 X-AOL-IP: 193.82.116.20 X-AOL-SPF: domain : blacksheep.org SPF : temperror X-Mailer: Unknown (No Version) --00151758a55e45c242048c3c590e Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Thanks Stefan. I think something like these pot cores will be needed. 73s Roger G3XBM 2010/7/25 Stefan Sch=E4fer > Roger, this depends on the bandwith or Q that you want to have. You cou= ld > build band filters that are much smaller than the band! But this is mayb= e > not necessary in your case. > > Something between 1...10mH is suited for a band filter on 137 kHz and a > high =B5 pot core could be used. Like those 3 parts (just to get the ide= a): > > > http://www.reichelt.de/?;ACTION=3D3;LA=3D444;GROUP=3DB518;GROUPID=3D3184= ;ARTICLE=3D18122;START=3D0;SORT=3Dartnr;OFFSET=3D16;SID=3D15JIWLJ6wQAQ8AAH= xJvWQac55f2a2a7babaa8c12242b8396a4dfd > > > http://www.reichelt.de/?;ACTION=3D3;LA=3D444;GROUP=3DB518;GROUPID=3D3184= ;ARTICLE=3D13224;START=3D0;SORT=3Dartnr;OFFSET=3D16;SID=3D15JIWLJ6wQAQ8AAH= xJvWQac55f2a2a7babaa8c12242b8396a4dfd > > > http://www.reichelt.de/?;ACTION=3D3;LA=3D444;GROUP=3DB518;GROUPID=3D3184= ;ARTICLE=3D19391;START=3D0;SORT=3Dartnr;OFFSET=3D16;SID=3D15JIWLJ6wQAQ8AAH= xJvWQac55f2a2a7babaa8c12242b8396a4dfd > > > 73, Stefan > > > Am 25.07.2010 21:53, schrieb Roger Lapthorn: > > All, > > Thanks for the good advice already regarding LPF toroids for 136kHz. Sou= nds > like a T68-2 or T157-2 (or something in between) should fit my requireme= nts > well. Mal, et al, my ERP is unlikely to exceed a few milliwatts on 136kH= z, > 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? Somethi= ng like >>> the KANK3333 inductors from Toko? Again, nothing too big unless thi= s 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 > > --=20 http://g3xbm-qrp.blogspot.com/ http://www.g3xbm.co.uk http://www.youtube.com/user/g3xbm G3XBM GQRP 1678 ISWL G11088 --00151758a55e45c242048c3c590e Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Thanks Stefan. I think something like these pot cores will be needed.
<= br>73s
Roger G3XBM



2010/7/25= Stefan Sch=E4fer <schaefer@iup.uni-heidelberg.de>
=20
Roger, this depends on the bandwith or Q that you want to have. You could build band filters that are much smaller than the band! But this is maybe not necessary in your case.

Something between 1...10mH is suited for a band filter on 137 kHz and a high =B5 pot core could be used. Like those 3 parts (just to get the idea):

http://w= ww.reichelt.de/?;ACTION=3D3;LA=3D444;GROUP=3DB518;GROUPID=3D3184;ARTICLE= =3D18122;START=3D0;SORT=3Dartnr;OFFSET=3D16;SID=3D15JIWLJ6wQAQ8AAHxJvWQac5= 5f2a2a7babaa8c12242b8396a4dfd

http://w= ww.reichelt.de/?;ACTION=3D3;LA=3D444;GROUP=3DB518;GROUPID=3D3184;ARTICLE= =3D13224;START=3D0;SORT=3Dartnr;OFFSET=3D16;SID=3D15JIWLJ6wQAQ8AAHxJvWQac5= 5f2a2a7babaa8c12242b8396a4dfd

http://w= ww.reichelt.de/?;ACTION=3D3;LA=3D444;GROUP=3DB518;GROUPID=3D3184;ARTICLE= =3D19391;START=3D0;SORT=3Dartnr;OFFSET=3D16;SID=3D15JIWLJ6wQAQ8AAHxJvWQac5= 5f2a2a7babaa8c12242b8396a4dfd


73, Stefan


Am 25.07.2010 21:53, schrieb Roger Lapthorn:
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 <g4wg= t@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 (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 you have a large antenna 20w is not enough on 137 for any serious impact.
The aim on this band=A0is for= at least 1W 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 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?=A0 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.g3= xbm.co.uk
ht= tp://www.youtube.com/user/g3xbm
G3XBM=A0 =A0 GQRP 1678=A0 =A0 =A0 ISWL G11088




--
http://g3xb= m-qrp.blogspot.com/
http://www.g3xbm.co= .uk
http://w= ww.youtube.com/user/g3xbm
G3XBM=A0 =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
--00151758a55e45c242048c3c590e--