Return-Path: Received: from mtain-mc11.r1000.mx.aol.com (mtain-mc11.r1000.mx.aol.com [172.29.96.83]) by air-me02.mail.aol.com (v129.4) with ESMTP id MAILINME022-8ba54c4c884b4a; Sun, 25 Jul 2010 14:54:03 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-mc11.r1000.mx.aol.com (Internet Inbound) with ESMTP id 54030380000F7; Sun, 25 Jul 2010 14:54:02 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Od6Jv-0000Q7-QD for rs_out_1@blacksheep.org; Sun, 25 Jul 2010 19:53:07 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Od6Jv-0000Py-A5 for rsgb_lf_group@blacksheep.org; Sun, 25 Jul 2010 19:53:07 +0100 Received: from out1.ip07ir2.opaltelecom.net ([62.24.128.243]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Od6Jt-0005MY-Lo for rsgb_lf_group@blacksheep.org; Sun, 25 Jul 2010 19:53:07 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AhYFAOskTExOk8Ki/2dsb2JhbACPRAOQGHG+dIU2BIsw X-IronPort-AV: E=Sophos;i="4.55,258,1278284400"; d="scan'208,217";a="454818234" Received: from unknown (HELO xphd97xgq27nyf) ([78.147.194.162]) by out1.ip07ir2.opaltelecom.net with SMTP; 25 Jul 2010 19:52:58 +0100 Message-ID: <004401cb2c2a$9729aad0$0601a8c0@xphd97xgq27nyf> From: "mal hamilton" To: References: <002a01cb2c25$ed5da320$0601a8c0@xphd97xgq27nyf> Date: Sun, 25 Jul 2010 19:52:54 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 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="----=_NextPart_000_0041_01CB2C32.F8B99550" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_40_50,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: 3039ac1d60534c4c884a10e6 X-AOL-IP: 193.82.116.20 X-AOL-SPF: domain : blacksheep.org SPF : none ------=_NextPart_000_0041_01CB2C32.F8B99550 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable No so, only in the UK generally, and 10w erp has been authorised in th= e past, other countries 20 plus watts erp. If you have a vy small antenna you would need around 5Kw to get 1w erp= and would need about 10 T-200 toroids stacked times 2 for your filter= . The trend in the past on 137 has been to work long haul with the odd= local QSO. mal/g3kev=20 ----- Original Message -----=20 From: Gary - G4WGT=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Sunday, July 25, 2010 7:39 PM Subject: Re: LF: Re: 136kHz LPF toroids? 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 lar= ge 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 -----=20 From: Roger Lapthorn=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Sunday, July 25, 2010 6:58 PM Subject: LF: 136kHz LPF toroids? Some advice please....=20 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.=20 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.=20 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 ------=_NextPart_000_0041_01CB2C32.F8B99550 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
No so, only in the UK generally, = ;and 10w erp=20 has been authorised in the past,  other countries 20 plus wa= tts=20 erp.
If you have a vy small antenna you wo= uld need=20 around 5Kw to get 1w erp and would need about 10 T-200 toroids stacked= times 2=20 for your filter.
The trend in the past on 137 has been= to work long=20 haul with the odd local QSO.
mal/g3kev
----- Original Message -----
Sent: Sunday, July 25, 2010= 7:39 PM
Subject: Re: LF: Re: 136kHz= LPF=20 toroids?

Hi Mal,

You wrote :-
The= aim on this=20 band is for at least 1W erp

The maximum allowed= ERP for this=20 band (136kHz) is 1 watt ERP.

73

Gary - G4WGT.


On 25 July 2010 19:19, mal hamilton <g3kevm= al@talktalk.net>=20 wrote:
Roger
A T- 200 is ideal but maybe too= large for u.=20 Except you have a large antenna 20w is not enough on 137 for any= serious=20 impact.
The aim on this band is for= at least 1W=20 erp
de mal/g3kev
 
----- Original Message -----
To: rsgb_lf_group@blacksheep.org
Sent: Sunday, July 25, 20= 10 6:58=20 PM
Subject: LF: 136kHz LPF= =20 toroids?

Some advice please....
  1. I'm about to construct a 136kHz transverter with an output= power up=20 to 20W. What's the best choice of toroid for the TX out= put low=20 pass filter inductors for this sort of power level?  Arou= nd 54uH is=20 required and this is rather too much for a T50 (red) toroid th= at I used=20 on 500kHz. I don't want anything too physically large if I can= avoid it.=20
  2. Also, are there any readily available canned inductors (or= toroids)=20 suitable for use as the input tuned circuit on RX? Something= like the=20 KANK3333 inductors from Toko? Again, nothing too big unless th= is is a=20 necessity for large signal handling.
Thanks in advan= ce for=20 inputs.

73s
Roger G3XBM

--
http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk
http://www.youtube.com/user/g3xbm
G3XBM   =20 GQRP 1678      ISWL=20 G11088

------=_NextPart_000_0041_01CB2C32.F8B99550--