Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-di06.r1000.mx.aol.com (Internet Inbound) with ESMTP id AB7AA3800008F; Sat, 15 Dec 2012 11:32:15 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Tjue6-00024p-DD for rs_out_1@blacksheep.org; Sat, 15 Dec 2012 16:31:26 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Tjue5-00024g-TU for rsgb_lf_group@blacksheep.org; Sat, 15 Dec 2012 16:31:25 +0000 Received: from out1.ip06ir2.opaltelecom.net ([62.24.128.242]) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1Tjue3-0005A0-QE for rsgb_lf_group@blacksheep.org; Sat, 15 Dec 2012 16:31:24 +0000 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AgMFAESkzFBcHnWB/2dsb2JhbABFpwQDl0sXc4IZBQEBBQgBAQNJAiwBAQMFAgEDEQQBAQolFAEEGgYWCAYTCgECAgEBh3ADEwixRQ2JVYt0aStvgykDiCuFUYY3jQ2FEYJz X-IronPort-AV: E=Sophos;i="4.84,291,1355097600"; d="scan'208,217";a="560014721" Received: from host-92-30-117-129.as13285.net (HELO xphd97xgq27nyf) ([92.30.117.129]) by out1.ip06ir2.opaltelecom.net with SMTP; 15 Dec 2012 16:31:02 +0000 Message-ID: <003c01cddae1$91b90150$0501a8c0@xphd97xgq27nyf> From: "mal hamilton" To: References: Date: Sat, 15 Dec 2012 16:31:00 -0000 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: 3.8 (+++) 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: Warren I have used Litz wire, for the application that you describe, plus other different types of wire around 3mm thick and it makes no noticeable difference since there is so little wire involved. I have not tried the current fed amplifier. I have used the voltage class D and it works fb also Class E which also works very well but it is critical to set up but there after very reliable and probably more stable than a D type The Decca amps with FETS in bridge configuration and a TANK coil resonated at the frequency of interest is very stable and reliable You have a great choice. 73 es gl de mal/g3kev [...] Content analysis details: (3.8 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 SPF_PASS SPF: sender matches SPF record 0.0 HTML_MESSAGE BODY: HTML included in message 3.8 AXB_XMAILER_MIMEOLE_OL_024C2 AXB_XMAILER_MIMEOLE_OL_024C2 X-Scan-Signature: 18c242620d7d7b91a1caf5740aa3e326 Subject: LF: Re: M0BMU mods to the G0MRF PA Content-Type: multipart/alternative; boundary="----=_NextPart_000_0039_01CDDAE1.91893EC0" 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-sid: 3039ac1da60a50cca60f088b 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_0039_01CDDAE1.91893EC0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Warren I have used Litz wire, for the application that you describe, plus other = different types of wire around 3mm thick and it makes no noticeable = difference since there is so little wire involved.=20 I have not tried the current fed amplifier. I have used the voltage = class D and it works fb also Class E which also works very well but it = is critical to set up but there after very reliable and probably more = stable than a D type The Decca amps with FETS in bridge configuration and a TANK coil = resonated at the frequency of interest is very stable and reliable You have a great choice. 73 es gl de mal/g3kev ----- 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_0039_01CDDAE1.91893EC0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Warren
I have used Litz wire, for the application that = you=20 describe, plus other different types of wire around 3mm thick and it = makes no=20 noticeable difference since there is so little wire involved. =
I have not tried the current fed amplifier. I = have used=20 the voltage class D and it works fb also Class E which also works very = well but=20 it is critical to set up but there after very reliable and probably more = stable=20 than a D type
The Decca amps with FETS in bridge configuration = and a=20 TANK coil resonated at the frequency of interest is very stable and=20 reliable
You have a great choice.
73 es gl de mal/g3kev
 
 
----- 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

 
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