Return-Path: Received: from mtain-me08.r1000.mx.aol.com (mtain-me08.r1000.mx.aol.com [172.29.96.144]) by air-df03.mail.aol.com (v129.4) with ESMTP id MAILINDF034-5eed4caf78dc3c; Fri, 08 Oct 2010 16:02:36 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-me08.r1000.mx.aol.com (Internet Inbound) with ESMTP id 6059D380001CA; Fri, 8 Oct 2010 16:02:35 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1P4J7c-0007z9-Ri for rs_out_1@blacksheep.org; Fri, 08 Oct 2010 21:00:52 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1P4J7c-0007z0-C1 for rsgb_lf_group@blacksheep.org; Fri, 08 Oct 2010 21:00:52 +0100 Received: from smtp-vbr7.xs4all.nl ([194.109.24.27]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1P4J7a-0000xV-Kx for rsgb_lf_group@blacksheep.org; Fri, 08 Oct 2010 21:00:52 +0100 Received: from PCvanAlbert (a80-101-33-132.adsl.xs4all.nl [80.101.33.132]) by smtp-vbr7.xs4all.nl (8.13.8/8.13.8) with SMTP id o98K0hFB072188 for ; Fri, 8 Oct 2010 22:00:49 +0200 (CEST) (envelope-from westberg@xs4all.nl) Message-ID: <0E0F340CE2604C5FBB7566C9CCD152E9@PCvanAlbert> From: "Albert" To: References: <001901cb6719$f002a6a0$0401a8c0@xphd97xgq27nyf> <4D401AACB7AF468FB666E98A3E88CCD2@PCvanAlbert> <002b01cb6721$d2406b90$0401a8c0@xphd97xgq27nyf> In-Reply-To: <002b01cb6721$d2406b90$0401a8c0@xphd97xgq27nyf> Date: Fri, 8 Oct 2010 22:00:43 +0200 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 V6.0.6002.18263 X-Virus-Scanned: by XS4ALL Virus Scanner X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: LF: Re: Re: Re: Decca 5501 500 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0011_01CB6734.40EEE730" 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: 3039ac1d60904caf78db339c X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none ------=_NextPart_000_0011_01CB6734.40EEE730 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Mal, Thanks info. I only changed the PA L and C values to resonate on 500= kHz. Max output 800 W at 57 V supply. 73, Albert =20 ----- Original Message -----=20 From: mal hamilton=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Friday, October 08, 2010 9:48 PM Subject: LF: Re: Re: Decca 5501 500 Albert I did not use any of the original PA components, just the driver/PA= unit. I have the option of VFO or Xtal ctl to drive the unit and I calcula= ted the values for the PA coil and Caps. I used an air wound coil and= new caps, also a different ferrite matching transformer to match PA= fets to 50 ohms. My HT supply is 60 Volts and the driver voltage regulated 26Volts.= One individuial unit is sufficient on 500 Kcs but multiple units can= be used with a suitable ratio of windings for the matching transforme= r to 50 ohms or whatever Z you require. My antenna system and test equipment is designed for 50 ohms. If= you have optimum PA L/C values with suitable ferrite 3C5 matching tra= nsformer then power output is similar to the original design figures. 73 de mal/g3kev ----- Original Message -----=20 From: Albert=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Friday, October 08, 2010 8:15 PM Subject: LF: Re: Decca 5501 500 Hello Mal, As you know I did the same a couple of years ago. What is your max= . output and at what supply voltage ? Did you leave the coupling/outpu= t transformer as it was ? 73, Albert PA0A =20 ----- Original Message -----=20 From: mal hamilton=20 To: rsgb=20 Sent: Friday, October 08, 2010 8:52 PM Subject: LF: Decca 5501 500 MF grp I have modified a Decca 5501 unit for 500 Kcs and am currently= using it on the band and getting good reports. Circuit details available for anyone interested in converting th= ese units. 73 de mal/g3kev ------=_NextPart_000_0011_01CB6734.40EEE730 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Mal,
 
Thanks info. I only changed the PA L= and C values=20 to resonate on 500 kHz. Max output 800 W at 57 V supply.
 
73, Albert  
----- Original Message -----
From:=20 mal=20 hamilton
Sent: Friday, October 08, 201= 0 9:48=20 PM
Subject: LF: Re: Re: Decca 55= 01 500

Albert
I did not use any of the original= PA components,=20 just the driver/PA unit.
I have the option of VFO or Xtal ct= l to drive the=20 unit and I calculated the values for the PA coil and Caps. I=20 used an  air wound coil and new caps, also a different fer= rite=20 matching transformer to match PA fets to 50 ohms.
My HT supply is 60 Volts and the&nb= sp;driver=20 voltage regulated 26Volts. One individuial unit is sufficient= on 500 Kcs=20 but multiple units can be used with a suitable ratio of windings for= =20 the matching transformer to 50 ohms or whatever Z you=20 require.
 My antenna system and test eq= uipment is=20 designed for 50 ohms.  If you have optimum PA L/C values&n= bsp;with=20 suitable ferrite 3C5 matching transformer then power output is= similar to=20 the original design figures.
 73 de mal/g3kev
 
 
 
----- Original Message -----
From:=20 A= lbert=20
Sent: Friday, October 08,= 2010 8:15=20 PM
Subject: LF: Re: Decca 5501= 500

Hello Mal,
 
As you know I did the same a coup= le of years=20 ago. What is your max. output and at what supply vo= ltage ?=20 Did you leave the coupling/output transformer as it was ?
 
73, Albert=20 PA0A    
----- Original Message -----
From:=20 mal=20 hamilton
To: rsgb
Sent: Friday, October 08,= 2010 8:52=20 PM
Subject: LF: Decca 5501= 500

MF grp
I have modified a Decca 5501 un= it for 500 Kcs=20 and am currently using it on the band and getting good=20 reports.
Circuit details available for= anyone=20 interested in converting these units.
73 de mal/g3kev
 
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