Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mg03.r1000.mx.aol.com (Internet Inbound) with ESMTP id CCE09380000A5; Thu, 20 Dec 2012 04:56:14 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Tlcq4-0004WX-LK for rs_out_1@blacksheep.org; Thu, 20 Dec 2012 09:54:52 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Tlcq2-0004WK-Lr for rsgb_lf_group@blacksheep.org; Thu, 20 Dec 2012 09:54:50 +0000 Received: from nm4.bt.bullet.mail.ird.yahoo.com ([212.82.108.235]) by relay1.thorcom.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.77) (envelope-from ) id 1Tlcpq-0004xY-HL for rsgb_lf_group@blacksheep.org; Thu, 20 Dec 2012 09:54:49 +0000 Received: from [212.82.108.228] by nm4.bt.bullet.mail.ird.yahoo.com with NNFMP; 20 Dec 2012 09:54:11 -0000 Received: from [217.146.188.236] by tm1.bt.bullet.mail.ird.yahoo.com with NNFMP; 20 Dec 2012 09:54:11 -0000 Received: from [127.0.0.1] by smtp821.mail.ird.yahoo.com with NNFMP; 20 Dec 2012 09:54:11 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=btinternet.com; s=s1024; t=1355997251; bh=mow6PAuZDBCwaDIxrc8gWicSdRWBwdtf/5B9m448lbA=; h=X-Yahoo-Newman-Id:X-Yahoo-Newman-Property:X-YMail-OSG:X-Yahoo-SMTP:Received:From:To:References:Subject:Date:Message-ID:MIME-Version:Content-Type:X-Mailer:X-MimeOLE:In-Reply-To:Thread-Index; b=O5RF/+npT/hZGeJDgTAYTGXMsdzJsZT0npRXKAl/lmMHrx0DV685NHGpT1TlwGEVXUWDqWQ/+BkfVSW4lqJCcZR0RpdF0/6RyqnzIRlCEZR7Bt7OwoezUnNwPdW6CpSKVzZtkn4yBDdvUPS+wT9zieV+ndcE0SksqaBGIS9DHfc= X-Yahoo-Newman-Id: 286717.16903.bm@smtp821.mail.ird.yahoo.com X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: nySNE3MVM1ktylfc_Zvc7iGwvsqQ_AaChPYUo4j25cxjpcd aDtbldvhvPwPCeVsUhtzGwu2QkokdqTDTL3qV_x2VPDZHuSd2DqeG7X3Cojx n6xhIitwpMDCIUvDVPriqYPZDpcbA9df2kmWY0BMuMJA0rh_lyb_qDbntnr0 yOHsr3XSD2Bnx4ZQ0z3f4R71CDt6Lp.8_mQiQsBAADhylGomu37zUkcHb1lO GyAyplMUgwYYwTf7Ntpu5WlNMvl4U5Ri7Pm1CgUv0Ua_cXmR8yowBXuKRI9Y cQH.AMSQRQWI_VBVyAnUH5zEfMIIdrybkS2kDKOOEEksg1Cz7P3aU73WkE_n MjVt0LHu8hHeuRHfzMzMg6B88V_nlR0zZeM64GGjOOypUUECkSyn7_mKbJBQ DJb4X822vJU1lyjFhlRcxNs3nAihxE9IxHHBuHpaPc1zE06qXyr.yewA8U8L 320O4LYEPhA-- X-Yahoo-SMTP: 9Y6mUHuswBAgnrOsukIiNdFDf95uy_Dz34nY1hlg2liKgYD952sjbg-- Received: from lindavideo (ken.h.wright@86.130.1.164 with login) by smtp821.mail.ird.yahoo.com with SMTP; 20 Dec 2012 09:54:11 +0000 UTC From: "Ken" To: References: <000901cdddcc$a80a3300$0501a8c0@xphd97xgq27nyf> <53A793BE30F44797BAFF0AD8FED68450@lindavideo> <001b01cdde37$acae6410$0501a8c0@xphd97xgq27nyf> Date: Thu, 20 Dec 2012 09:54:09 -0000 Message-ID: MIME-Version: 1.0 X-Mailer: Microsoft Office Outlook 11 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.6157 In-Reply-To: Thread-Index: Ac3eOfK0cNaC7pyeScKrZy0GyTIVBgAXYHSQ 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 Graham. I have about 60uF smoothing, did the ripple calculation from an old ARRL Handbook. Ken [...] 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 [212.82.108.235 listed in list.dnswl.org] 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid 0.0 UNPARSEABLE_RELAY Informational: message has unparseable relay lines X-Scan-Signature: 321ff684ea5941bc203a0284601061e8 Subject: RE: LF: Re: RE: MORE VALVES Content-Type: multipart/alternative; boundary="----=_NextPart_000_0040_01CDDE97.F542DC00" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.2 required=5.0 tests=HTML_70_80, HTML_FONTCOLOR_UNKNOWN,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-mg03.r1000.mx.aol.com ; domain : btinternet.com DKIM : pass x-aol-sid: 3039ac1d60cb50d2e0bd101a 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_0040_01CDDE97.F542DC00 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Hi Graham. I have about 60uF smoothing, did the ripple calculation from an old ARRL Handbook. Ken _____ From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Graham Sent: 19 December 2012 22:40 To: rsgb_lf_group@blacksheep.org Subject: Re: LF: Re: RE: MORE VALVES 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 will need 1500-0-1500 1 amp oil filled , choke smoothing ? .. time to dig out the 1950 handbooks G From: mal hamilton Sent: Wednesday, December 19, 2012 10:24 PM To: rsgb_lf_group@blacksheep.org 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. 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 ----- From: Ken To: rsgb_lf_group@blacksheep.org 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). 73. Ken M0KHW _____ 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 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 ------=_NextPart_000_0040_01CDDE97.F542DC00 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Hi = Graham.

I have about 60uF smoothing, did = the ripple calculation from an old ARRL = Handbook.

 

Ken

 

From: = owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Graham
Sent: 19 December 2012 = 22:40
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: Re: RE: = MORE VALVES

 

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 

 

will  need   1500-0-1500  1 amp  oil = filled , choke  smoothing ? .. time to  dig   out the  1950 handbooks

 

G

 

From: mal hamilton

Sent: Wednesday, December 19, 2012 10:24 PM

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. =

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 ----- =

From: Ken

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).

 

73.

 

Ken

 

M0KHW

 

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

 

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

 

------=_NextPart_000_0040_01CDDE97.F542DC00--