Return-Path: Received: from mtain-da04.r1000.mx.aol.com (mtain-da04.r1000.mx.aol.com [172.29.64.76]) by air-da10.mail.aol.com (v129.4) with ESMTP id MAILINDA101-85ec4c4c91772be; Sun, 25 Jul 2010 15:33:11 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-da04.r1000.mx.aol.com (Internet Inbound) with ESMTP id 1DE8F38000091; Sun, 25 Jul 2010 15:33:10 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Od6vR-0000gO-AP for rs_out_1@blacksheep.org; Sun, 25 Jul 2010 20:31:53 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Od6vQ-0000gF-IS for rsgb_lf_group@blacksheep.org; Sun, 25 Jul 2010 20:31:52 +0100 Received: from mail-ww0-f47.google.com ([74.125.82.47]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Od6vP-0005dz-HS for rsgb_lf_group@blacksheep.org; Sun, 25 Jul 2010 20:31:52 +0100 Received: by wwb34 with SMTP id 34so2490159wwb.28 for ; Sun, 25 Jul 2010 12:31:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:sender:received :in-reply-to:references:date:x-google-sender-auth:message-id:subject :from:to:content-type; bh=NKGIINdF9x1Jxgw4ZsMNImnth3EkhCu56Ub5KRBkBuc=; b=pr8IjX3GeeM5U1iKXI9L4Mtu8Yvib9Ii/18FcfYxSMnJShxZ1jCyX7PBGG0SyM6vR2 Y2Dj4Rd2T87FsjIC9tM76ri41xsWZk6V2RXJ6xPoUb9nmnfmCotnMQooQyMbebhsf6/Q v5o6earDcZ7e4D8bQ75IjXnQUlobE2WlZXiAE= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:content-type; b=l119jy/Bcpmmjt1DbKykhjsouQAwBn5z3dmW/Xbrq0uXNexyWhL43I50WbpGWVNMIe +nmxYwukqDct1Zq4kFdjKE2Fv2eE953ed1b0qPB8BrkdBhV5sE9H1bNikI4li2YfjE/r 9nZEoE4fVSnw9Itz5vOVdkFrunOdxlnz8oHwY= MIME-Version: 1.0 Received: by 10.216.49.212 with SMTP id x62mr2533115web.55.1280086304289; Sun, 25 Jul 2010 12:31:44 -0700 (PDT) Received: by 10.216.158.67 with HTTP; Sun, 25 Jul 2010 12:31:44 -0700 (PDT) In-Reply-To: <004401cb2c2a$9729aad0$0601a8c0@xphd97xgq27nyf> References: <002a01cb2c25$ed5da320$0601a8c0@xphd97xgq27nyf> <004401cb2c2a$9729aad0$0601a8c0@xphd97xgq27nyf> Date: Sun, 25 Jul 2010 20:31:44 +0100 X-Google-Sender-Auth: 9aNyRfLY3Vh4AXo6N837U5U2iME Message-ID: From: Gary - G4WGT 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=001485f5ce5c736d21048c3b5131 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_30_40,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-d252.2 ; domain : gmail.com DKIM : fail x-aol-sid: 3039ac1d404c4c4c917642f0 X-AOL-IP: 193.82.116.20 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) --001485f5ce5c736d21048c3b5131 Content-Type: text/plain; charset=ISO-8859-1 Mal, I was making the point clear as Roger is a UK amateur & 1 watt ERP is currently the legal maximum on the 136kHz band. Gary - G4WGT. On 25 July 2010 19:52, mal hamilton wrote: > No so, only in the UK generally, and 10w erp has been authorised in the > 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 > > ----- Original Message ----- > *From:* Gary - G4WGT > *To:* rsgb_lf_group@blacksheep.org > *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 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 >> >> > --001485f5ce5c736d21048c3b5131 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Mal,

I was making the point clear as Roger is a UK amat= eur & 1 watt ERP is currently the legal maximum on the 136kHz band.

Gary - G4WGT.


On 25 July 2010 19:52, mal hamilton <g3kevmal@talktalk.net> wrote:
No so, only in the UK generally,=A0an= d 10w erp=20 has been=A0authorised in the past, =A0other countries 20 plus watts=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 tim= es 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 -----
From:=20 Gary -=20 G4WGT
<= b>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=A0is 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 <g3= kevmal@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 serio= us=20 impact.
The aim on this band=A0is for at= least 1W=20 erp
de mal/g3kev
=A0
----- Original Message -----
Sent: Sunday, July 25, 2010 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?=A0 Around 54uH= is=20 required and this is rather too much for a T50 (red) toroid that= 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 (o= r 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 this= is a=20 necessity for large signal handling.
Thanks in advance= for=20 inputs.

73s
Roger G3XBM

--
http://g3xbm-qrp.bl= ogspot.com/
ht= tp://www.g3xbm.co.uk
http://www= .youtube.com/user/g3xbm
G3XBM=A0 =A0=20 GQRP 1678=A0 =A0 =A0 ISWL=20 G11088


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