Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dc02.r1000.mx.aol.com (Internet Inbound) with ESMTP id 5F90C3800009D; Wed, 19 Dec 2012 17:41:12 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1TlSJG-0008G1-7n for rs_out_1@blacksheep.org; Wed, 19 Dec 2012 22:40:18 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1TlSJF-0008Fs-Ml for rsgb_lf_group@blacksheep.org; Wed, 19 Dec 2012 22:40:17 +0000 Received: from smtpout3.wanadoo.co.uk ([80.12.242.59] helo=smtpout.wanadoo.co.uk) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1TlSJD-0002uD-OH for rsgb_lf_group@blacksheep.org; Wed, 19 Dec 2012 22:40:16 +0000 Received: from AGB ([2.26.22.72]) by mwinf5d32 with ME id dafu1k00G1ZK6g203afvKU; Wed, 19 Dec 2012 23:39:55 +0100 Message-ID: From: "Graham" To: References: <000901cdddcc$a80a3300$0501a8c0@xphd97xgq27nyf> <53A793BE30F44797BAFF0AD8FED68450@lindavideo> <001b01cdde37$acae6410$0501a8c0@xphd97xgq27nyf> In-Reply-To: <001b01cdde37$acae6410$0501a8c0@xphd97xgq27nyf> Date: Wed, 19 Dec 2012 22:39:54 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8117.416 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8117.416 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: Talking of wobbles , no wobbly bob before operating as well !! It would be funny if the NOV stated 100 mW max erp or some other qrp level .... 650-0-650 400 mA , too small , core will saturate with FW bridge , the centre tap indicates the core is 'small' as designed for half wave .. will need over 40 mF smoothing at those rates , if its single phase 50 hz , that's 4Kw pk [...] 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 [80.12.242.59 listed in list.dnswl.org] 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: da503d40de1d15ba476c143c8a26a457 Subject: Re: LF: Re: RE: MORE VALVES Content-Type: multipart/alternative; boundary="----=_NextPart_000_02D9_01CDDE39.C418E380" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.4 required=5.0 tests=HTML_50_60, HTML_FONTCOLOR_UNKNOWN,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: 3039ac1d408250d2428834b0 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_02D9_01CDDE39.C418E380 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Talking of wobbles , no wobbly bob before operating as well !! It would be funny if the NOV stated 100 mW max erp or some = other qrp level .... 650-0-650 400 mA , too small , core will saturate with FW bridge , = the centre tap indicates the core is 'small' as designed for = half wave .. will need over 40 mF smoothing at those rates , if = its single phase 50 hz , that's 4Kw pk =20 will need 1500-0-1500 1 amp oil filled , choke smoothing ? .. time = to dig out the 1950 handbooks=20 G From: mal hamilton=20 Sent: Wednesday, December 19, 2012 10:24 PM To: rsgb_lf_group@blacksheep.org=20 Subject: LF: Re: RE: MORE VALVES Ken The valve and base in the picture is a 4CX1500B that was intended for = 137 Khz not 500 Khz.=20 At present both on 137 es 500 I am using solid state Transmitters, which = are probably safer. I do have a selection of Dentron Amplifiers for the = HF Bands with 8875 valves. Watch those High Voltages, no margin for mistakes, one Wobble and you = Vaporise !! 73 es GL de Mal/G3KEV ----- Original Message -----=20 From: Ken=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Wednesday, December 19, 2012 8:20 PM Subject: LF: RE: MORE VALVES Hi Mal. What valve are you using? I am currently building a TX with a 6293 = Beam Tetrode in the PA. the building of the two power units has slowed = the construction down with the inter-linking control cables etc. The PA = xformer is 650 - 0 - 650 volts @ 400mA with a bridge rectifier, the = valve max anode voltage is 3Kv and anode current 1.5A. I am hoping for = Class C, 500 watts output cw on 472kHz (if we ever get the NoV). =20 73. =20 Ken =20 M0KHW =20 -------------------------------------------------------------------------= ----- From: owner-rsgb_lf_group@blacksheep.org = [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of mal = Hamilton-Sent: 19 December 2012 09:39 To: rsgb Subject: LF: MORE VALVES =20 This is a 137 Class C amp project, but since CW activity has dropped = to virtually NIL I am not rushing to complete. de G3KEV =20 ------=_NextPart_000_02D9_01CDDE39.C418E380 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Talking  of  wobbles  , no  wobbly  = bob =20 before  operating  as  well  !!
 
It would  be  funny if  the  NOV  = stated  100=20 mW  max  erp  or  some  other qrp level =20 ....
 
650-0-650  400 mA , too  small , core will  saturate = with  FW  bridge , the  centre tap   indicates = the =20 core  is  'small'  as  designed   for  = half =20 wave  .. will  need  over 40 mF  smoothing  at=20 those  rates  , if its single phase 50 hz  , that's  = 4Kw  pk 
 
will  need   1500-0-1500  1 amp  oil = filled ,=20 choke  smoothing ? .. time to  dig   out the  1950 = handbooks=20
 
G

From: mal hamilton
Sent: Wednesday, December 19, 2012 10:24 PM
To: rsgb_lf_group@blacksheep.org= =20
Subject: LF: Re: RE: MORE VALVES

Ken
The valve and base in the picture is a=20 4CX1500B  that was intended for 137 Khz not 500 Khz. =
At present both on 137 es 500 I am using solid = state=20 Transmitters, which are probably safer. I do have a selection of Dentron = Amplifiers for the HF Bands with 8875 valves.
Watch those High Voltages, no margin for = mistakes, one=20 Wobble and you Vaporise !!
73 es GL de Mal/G3KEV
 
 
----- Original Message -----
From:=20 Ken
Sent: Wednesday, December 19, = 2012 8:20=20 PM
Subject: LF: RE: MORE = VALVES

Hi=20 Mal.

What valve = are you=20 using? I am currently building a TX with a 6293 Beam Tetrode in the = PA. the=20 building of the two power units has slowed the construction down with = the=20 inter-linking control cables etc. The PA xformer is 650 =96 0 - 650 = volts @=20 400mA with a bridge rectifier, the valve max anode voltage is 3Kv and = anode=20 current 1.5A. I am hoping for Class C, 500 watts output cw on 472kHz = (if we=20 ever get the NoV).

 

73.

 

Ken

 

M0KHW

 

From:=20 owner-rsgb_lf_group@blacksheep.org=20 [mailto:owner-rsgb_lf_group@blacksheep.org]=20 On Behalf Of mal=20 Hamilton-Sent: 19 = December 2012=20 09:39
To: = rsgb
Subject: LF: MORE=20 VALVES

 

This is a 137 Class C=20 amp project, but since CW activity  has dropped to = virtually=20 NIL I am not rushing to complete.

de=20 G3KEV

 

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