Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dd03.r1000.mx.aol.com (Internet Inbound) with ESMTP id 13E61380000B7; Sat, 15 Dec 2012 16:52:24 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1TjzdJ-0004LB-4B for rs_out_1@blacksheep.org; Sat, 15 Dec 2012 21:50:57 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1TjzdI-0004L2-Ix for rsgb_lf_group@blacksheep.org; Sat, 15 Dec 2012 21:50:56 +0000 Received: from mail-lb0-f171.google.com ([209.85.217.171]) by relay1.thorcom.net with esmtps (TLSv1:RC4-SHA:128) (Exim 4.77) (envelope-from ) id 1TjzdF-0006IF-I5 for rsgb_lf_group@blacksheep.org; Sat, 15 Dec 2012 21:50:55 +0000 Received: by mail-lb0-f171.google.com with SMTP id gf7so3710710lbb.16 for ; Sat, 15 Dec 2012 13:50:32 -0800 (PST) X-DKIM-Result: Domain=gmail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=DoaAKZhyDo0IqiX9F0HoYT/rr7QAZljQUIqgbch+hIU=; b=z98ONh1Iyi4hOjIigtODUUPVh2u9EfSo9LiPIgPvhIMGYOOiUwtCwXmVvD4Thf/9Kz J6GOzHtG3bErmAaHldEHrYi/chnvuiaeNwNpLY2TggEKc6J3VjMRvrbSVAZsMfgH5OcB IyD18bM4rKE0SMP94A/e2yYmDdXW/h4Du5TbAf3V4+SRa1f7QBxo2Lu7CGarwyexUyhG REh+sSv/YzLM5Ga0QyY7K1dyWRkMynlzT8AevGH0X+Wa3I5J1LgMNe8S0K7JlhtP5iPA T+Aq8Dg0sVnMJp9/566uMs9Uf7UTyh8vMMvk2TtxQSnxgryc/D6Gb3zX/das6kIMCFHa 5jFw== MIME-Version: 1.0 Received: by 10.112.11.105 with SMTP id p9mr3722706lbb.129.1355608232343; Sat, 15 Dec 2012 13:50:32 -0800 (PST) Received: by 10.114.21.4 with HTTP; Sat, 15 Dec 2012 13:50:32 -0800 (PST) In-Reply-To: References: Date: Sat, 15 Dec 2012 16:50:32 -0500 Message-ID: From: Warren Ziegler To: rsgb_lf_group X-Spam-Score: -0.7 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Gary, Thanks for the info and picture, very useful! 73 Warren On Sat, Dec 15, 2012 at 3:01 PM, Gary - G4WGT wrote: > ** > Hi Warren, > > I have carried out the M0BMU mods to my G0MRF amp. The improvement is > extremely good. Not only does the PA run cool the output is greatly > increased. I have run mine at 600 watts into dummy load during the initial > testing after the mod & up to 400 watts into antenna during normal Tx. > > See my web page at :- > > http://myweb.tiscali.co.uk/wgtaylor/LF%20&%20MF%20Experiments%203.html > > I hope this will help. > > 73, > > Gary - G4WGT. > > > ----- Original Message ----- > *From:* Warren Ziegler > *To:* rsgb_lf_group > *Sent:* Saturday, December 15, 2012 4:17 PM > *Subject:* LF: M0BMU mods to the G0MRF PA > > Hello the list... > Since my G0MRF is experiencing intermittent short circuit in the > final amp, I plan on re-doing the output circuit per the M0BMU modification: > http://www.g0mrf.com/images/300w/PA_schematic.jpg > The M0BMU mod changes the circuit to a current fed design which > improves the efficiency. The mod calls for a transformer primary winding > using 12 strands of 0.3mm e.c.w. (enamel covered wire). > I assume that the 12 strands are used to improve the Q similar to the way > Litz wire works? > Has anyone done this mod? Has anyone tried alternatives to the 12 > strands of enamel wire? > > 73 & tnx Warren K2ORS > > > -- > 73 Warren K2ORS > WD2XGJ > WD2XSH/23 > WE2XEB/2 > WE2XGR/1 > > > > [...] Content analysis details: (-0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [209.85.217.171 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (wd2xgj[at]gmail.com) -0.0 SPF_PASS SPF: sender matches SPF record 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 3547ef0bd9aa4f6a2596c8a6b1b20265 Subject: Re: LF: Re: M0BMU mods to the G0MRF PA Content-Type: multipart/alternative; boundary=bcaec54eeaea24b90e04d0eb235f 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: mtain-dd03.r1000.mx.aol.com ; domain : gmail.com DKIM : pass x-aol-sid: 3039ac1d408f50ccf11813f6 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none --bcaec54eeaea24b90e04d0eb235f Content-Type: text/plain; charset=ISO-8859-1 Gary, Thanks for the info and picture, very useful! 73 Warren On Sat, Dec 15, 2012 at 3:01 PM, Gary - G4WGT wrote: > ** > Hi Warren, > > I have carried out the M0BMU mods to my G0MRF amp. The improvement is > extremely good. Not only does the PA run cool the output is greatly > increased. I have run mine at 600 watts into dummy load during the initial > testing after the mod & up to 400 watts into antenna during normal Tx. > > See my web page at :- > > http://myweb.tiscali.co.uk/wgtaylor/LF%20&%20MF%20Experiments%203.html > > I hope this will help. > > 73, > > Gary - G4WGT. > > > ----- Original Message ----- > *From:* Warren Ziegler > *To:* rsgb_lf_group > *Sent:* Saturday, December 15, 2012 4:17 PM > *Subject:* LF: M0BMU mods to the G0MRF PA > > Hello the list... > Since my G0MRF is experiencing intermittent short circuit in the > final amp, I plan on re-doing the output circuit per the M0BMU modification: > http://www.g0mrf.com/images/300w/PA_schematic.jpg > The M0BMU mod changes the circuit to a current fed design which > improves the efficiency. The mod calls for a transformer primary winding > using 12 strands of 0.3mm e.c.w. (enamel covered wire). > I assume that the 12 strands are used to improve the Q similar to the way > Litz wire works? > Has anyone done this mod? Has anyone tried alternatives to the 12 > strands of enamel wire? > > 73 & tnx Warren K2ORS > > > -- > 73 Warren K2ORS > WD2XGJ > WD2XSH/23 > WE2XEB/2 > WE2XGR/1 > > > > -- 73 Warren K2ORS WD2XGJ WD2XSH/23 WE2XEB/2 WE2XGR/1 --bcaec54eeaea24b90e04d0eb235f Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Gary,
=A0 =A0Thanks for the info and picture, very useful!
73= Warren



On Sat, Dec 15, 2012 at 3:01 PM, Gary - G4WGT <g4wgt@ti= scali.co.uk> wrote:
Hi Warren,
=A0
I have carried out the M0BMU mods to my G0MRF amp= .=20 The improvement is extremely good. Not only does the PA run cool the output= is=20 greatly increased. I have run mine at 600 watts into dummy load during the= =20 initial testing after the mod & up to 400 watts into antenna during nor= mal=20 Tx.
=A0
See my web page at :-
=A0
=A0
I hope this will help.
=A0
73,
=A0
Gary - G4WGT.
=A0
----- Original Message -----
From:=20 Warren Ziegler=20
Sent: Saturday, December 15, 2012 4= :17=20 PM
Subject: LF: M0BMU mods to the G0MR= F=20 PA

Hello the list...
=A0 =A0 =A0 =A0Since my G0MRF is experiencing intermittent=20 short circuit in the final amp, I plan on re-doing the output circuit per= the=20 M0BMU modification:
=A0 =A0 =A0 =A0The M0BMU mod changes the circuit to a current=20 fed design which improves the efficiency. The mod calls for a transformer= =20 primary winding using 12 strands of 0.3mm e.c.w. (enamel covered=20 wire).=A0
I assume that the 12 strands are used to improve the Q similar to th= e way=20 Litz wire works?=A0
=A0 =A0 =A0 =A0 Has anyone done this mod? Has anyone tried=20 alternatives to the 12 strands of enamel wire?

=A0 =A073 & tnx Warren K2ORS


--
73 Warren K2ORS
=A0 =A0 =A0 =A0 =A0=20 =A0 =A0 =A0 WD2XGJ
=A0 =A0 =A0 =A0 =A0 =A0=20 =A0 =A0 WD2XSH/23
=A0 =A0 =A0 =A0 =A0 =A0 =A0=20 =A0 WE2XEB/2
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=20 WE2XGR/1

=A0



--
73 Warren K2= ORS
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 WD2XGJ
=A0 =A0 =A0 =A0 =A0 =A0 = =A0 =A0 WD2XSH/23
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 WE2XEB/2
=A0 =A0 = =A0 =A0 =A0 =A0 =A0 =A0 WE2XGR/1

=A0
--bcaec54eeaea24b90e04d0eb235f--