Return-Path: Received: from mtain-dj02.r1000.mx.aol.com (mtain-dj02.r1000.mail.aol.com [172.19.187.138]) by air-de06.mail.aol.com (v129.4) with ESMTP id MAILINDE062-5eb74c4ca03821a; Sun, 25 Jul 2010 16:36:08 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-dj02.r1000.mx.aol.com (Internet Inbound) with ESMTP id D9D34380000AC; Sun, 25 Jul 2010 16:36:06 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Od7um-00018S-Sd for rs_out_1@blacksheep.org; Sun, 25 Jul 2010 21:35:16 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Od7um-00018I-9T for rsgb_lf_group@blacksheep.org; Sun, 25 Jul 2010 21:35:16 +0100 Received: from relay2.uni-heidelberg.de ([129.206.210.211]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Od7uj-00068G-Mw for rsgb_lf_group@blacksheep.org; Sun, 25 Jul 2010 21:35:16 +0100 Received: from ix.urz.uni-heidelberg.de (cyrus-portal.urz.uni-heidelberg.de [129.206.100.176]) by relay2.uni-heidelberg.de (8.13.8/8.13.8) with ESMTP id o6PKclTa030977 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Sun, 25 Jul 2010 22:38:47 +0200 Received: from extmail.urz.uni-heidelberg.de (extmail.urz.uni-heidelberg.de [129.206.100.140]) by ix.urz.uni-heidelberg.de (8.13.8/8.13.8) with ESMTP id o6PKZCCu006600 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Sun, 25 Jul 2010 22:35:12 +0200 Received: from [147.142.13.80] (vpn513-080.rzuser.uni-heidelberg.de [147.142.13.80]) by extmail.urz.uni-heidelberg.de (8.13.4/8.13.1) with ESMTP id o6PKZPNI028025 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Sun, 25 Jul 2010 22:35:26 +0200 Message-ID: <4C4CA000.2080303@iup.uni-heidelberg.de> Date: Sun, 25 Jul 2010 22:35:12 +0200 From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.11) Gecko/20100711 Thunderbird/3.0.6 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <002a01cb2c25$ed5da320$0601a8c0@xphd97xgq27nyf> In-Reply-To: X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,RATWARE_GECKO_BUILD=1.426 Subject: Re: LF: Re: 136kHz LPF toroids? Content-Type: multipart/alternative; boundary="------------090303050407020408060503" 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-sid: 3039cdbc9d064c4ca0367ffe X-AOL-IP: 193.82.116.20 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) --------------090303050407020408060503 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by relay2.uni-heidelberg.de id o6PKclTa030977 Roger, this depends on the bandwith or Q that you want to have. You=20 could build band filters that are much smaller than the band! But this=20 is maybe not necessary in your case. Something between 1...10mH is suited for a band filter on 137 kHz and a=20 high =B5 pot core could be used. Like those 3 parts (just to get the idea)= : http://www.reichelt.de/?;ACTION=3D3;LA=3D444;GROUP=3DB518;GROUPID=3D3184;A= RTICLE=3D18122;START=3D0;SORT=3Dartnr;OFFSET=3D16;SID=3D15JIWLJ6wQAQ8AAHxJ= vWQac55f2a2a7babaa8c12242b8396a4dfd http://www.reichelt.de/?;ACTION=3D3;LA=3D444;GROUP=3DB518;GROUPID=3D3184;A= RTICLE=3D13224;START=3D0;SORT=3Dartnr;OFFSET=3D16;SID=3D15JIWLJ6wQAQ8AAHxJ= vWQac55f2a2a7babaa8c12242b8396a4dfd http://www.reichelt.de/?;ACTION=3D3;LA=3D444;GROUP=3DB518;GROUPID=3D3184;A= RTICLE=3D19391;START=3D0;SORT=3Dartnr;OFFSET=3D16;SID=3D15JIWLJ6wQAQ8AAHxJ= vWQac55f2a2a7babaa8c12242b8396a4dfd 73, Stefan Am 25.07.2010 21:53, schrieb Roger Lapthorn: > All, > > Thanks for the good advice already regarding LPF toroids for 136kHz.=20 > Sounds like a T68-2 or T157-2 (or something in between) should fit my=20 > requirements well. Mal, et al, my ERP is unlikely to exceed a few=20 > milliwatts on 136kHz, so don't worry about me putting out too much=20 > power :-) > > Any suggestions on what inductor type to use for receiver input tuned=20 > 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 > > --=20 > 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 --------------090303050407020408060503 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit 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 µ pot core could be used. Like those 3 parts (just to get the idea):

http://www.reichelt.de/?;ACTION=3;LA=444;GROUP=B518;GROUPID=3184;ARTICLE=18122;START=0;SORT=artnr;OFFSET=16;SID=15JIWLJ6wQAQ8AAHxJvWQac55f2a2a7babaa8c12242b8396a4dfd

http://www.reichelt.de/?;ACTION=3;LA=444;GROUP=B518;GROUPID=3184;ARTICLE=13224;START=0;SORT=artnr;OFFSET=16;SID=15JIWLJ6wQAQ8AAHxJvWQac55f2a2a7babaa8c12242b8396a4dfd

http://www.reichelt.de/?;ACTION=3;LA=444;GROUP=B518;GROUPID=3184;ARTICLE=19391;START=0;SORT=artnr;OFFSET=16;SID=15JIWLJ6wQAQ8AAHxJvWQac55f2a2a7babaa8c12242b8396a4dfd


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 <g4wgt@tiscali.co.uk> 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 <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 is for at least 1W erp
de mal/g3kev
 
----- 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?  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
--------------090303050407020408060503--