Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mg05.r1000.mx.aol.com (Internet Inbound) with ESMTP id 39954380000A4; Sat, 15 Dec 2012 15:03:37 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1TjxwY-0003qo-SI for rs_out_1@blacksheep.org; Sat, 15 Dec 2012 20:02:42 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1TjxwW-0003qf-3w for rsgb_lf_group@blacksheep.org; Sat, 15 Dec 2012 20:02:40 +0000 Received: from mk-filter-3-a-1.mail.tiscali.co.uk ([212.74.100.54] helo=mk-filter-3-a-1.mail.uk.tiscali.com) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1TjxwN-0005z5-8f for rsgb_lf_group@blacksheep.org; Sat, 15 Dec 2012 20:02:38 +0000 X-Trace: 821917733/mk-filter-3.mail.uk.tiscali.com/B2C/$THROTTLED_DYNAMIC/b2c-CUSTOMER-DYNAMIC-IP/88.104.47.141/None/g4wgt@tiscali.co.uk X-SBRS: None X-RemoteIP: 88.104.47.141 X-IP-MAIL-FROM: g4wgt@tiscali.co.uk X-SMTP-AUTH: X-Originating-Country: GB/UNITED KINGDOM X-MUA: Microsoft Windows Mail 6.0.6002.18197Produced By Microsoft MimeOLE V6.1.7601.17609 X-IP-BHB: Once X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AgEFAC/WzFBYaC+N/2dsb2JhbABFpwMDl0wXc4IeAQEFCE4CDx0BBAUDAxEEAQEKJTMGFggGEwgJh3ADEwixNg2JVYt0aYEagkhhA4gsjAiCcoQ8hV+FEYJz X-IronPort-AV: E=Sophos;i="4.84,291,1355097600"; d="scan'208,217";a="821917733" Received: from 88-104-47-141.dynamic.dsl.as9105.com (HELO GaryAsus) ([88.104.47.141]) by smtp.tiscali.co.uk with SMTP; 15 Dec 2012 20:01:10 +0000 Message-ID: From: "Gary - G4WGT" To: References: In-Reply-To: Date: Sat, 15 Dec 2012 20:01:03 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6002.18197 X-MimeOLE: Produced By Microsoft MimeOLE V6.1.7601.17609 X-Spam-Score: -0.0 (/) 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: 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. [...] Content analysis details: (-0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [212.74.100.54 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (g4wgt[at]tiscali.co.uk) -0.0 SPF_HELO_PASS SPF: HELO matches SPF record -0.0 SPF_PASS SPF: sender matches SPF record -0.0 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: fb42d311bf65eb51bbb8124890b4f977 Subject: LF: Re: M0BMU mods to the G0MRF PA Content-Type: multipart/alternative; boundary="----=_NextPart_000_0015_01CDDAFE.E95CE4E0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.6 required=5.0 tests=HTML_40_50,HTML_MESSAGE, MISSING_OUTLOOK_NAME 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: 3039ac1d60cd50ccd799579b X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. ------=_NextPart_000_0015_01CDDAFE.E95CE4E0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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 -----=20 From: Warren Ziegler=20 To: rsgb_lf_group=20 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).=20 I assume that the 12 strands are used to improve the Q similar to the = way Litz wire works?=20 Has anyone done this mod? Has anyone tried alternatives to the = 12 strands of enamel wire? 73 & tnx Warren K2ORS --=20 73 Warren K2ORS WD2XGJ=20 WD2XSH/23 WE2XEB/2 WE2XGR/1 =20 ------=_NextPart_000_0015_01CDDAFE.E95CE4E0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Warren,
 
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 = normal=20 Tx.
 
See my web page at :-
 
http://myweb.tiscali.co.uk/wgtaylor/LF%20&%20MF%20Experime= nts%203.html
 
I hope this will help.
 
73,
 
Gary - G4WGT.
 
----- Original Message -----
From:=20 Warren = Ziegler=20
Sent: Saturday, December 15, = 2012 4:17=20 PM
Subject: LF: M0BMU mods to the = G0MRF=20 PA

Hello the list...
       Since 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:
http://www.g0m= rf.com/images/300w/PA_schematic.jpg
       The 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). 
I assume that the 12 strands are used to improve the Q similar to = the way=20 Litz wire works? 
        Has anyone done this mod? Has anyone = tried=20 alternatives to the 12 strands of enamel wire?

   73 & tnx Warren K2ORS


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

 
------=_NextPart_000_0015_01CDDAFE.E95CE4E0--