Return-Path: Received: from rly-dc10.mx.aol.com (rly-dc10.mail.aol.com [172.19.136.39]) by air-dc08.mail.aol.com (v124.15) with ESMTP id MAILINDC084-b474a5cf8a6ad; Tue, 14 Jul 2009 17:29:28 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-dc10.mx.aol.com (v124.15) with ESMTP id MAILRELAYINDC103-b474a5cf8a6ad; Tue, 14 Jul 2009 17:29:12 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1MQpXl-00046a-If for rs_out_1@blacksheep.org; Tue, 14 Jul 2009 22:28:09 +0100 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1MQpXi-00046R-Jp for rsgb_lf_group@blacksheep.org; Tue, 14 Jul 2009 22:28:06 +0100 Received: from smtp133.mail.mud.yahoo.com ([209.191.107.116]) by relay3.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1MQpXf-0001Mc-7B for rsgb_lf_group@blacksheep.org; Tue, 14 Jul 2009 22:28:03 +0100 Received: (qmail 50350 invoked from network); 14 Jul 2009 21:27:57 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=btinternet.com; h=Received:X-Yahoo-SMTP:X-YMail-OSG:X-Yahoo-Newman-Property:Message-ID:From:To:References:Subject:Date:MIME-Version:Content-Type:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=pjzXLFktRn8JKZsxAg+ki/StzSvwlS3yPBlpA2ePM/5vaVggF33MKjnp++lb/wcNOexEQk83U5P0lA7LR3XEHqVKJmWtdAqNJzVYFwX+c5VYMnMjft5kETF2HIcFViYBblkK3YbZbV2CzmqHFw/GnQJ8j/YOCf/Rx5O+j8RUR0A= ; Received: from unknown (HELO lindavideo) (ken.h.wright@86.140.224.132 with login) by smtp133.mail.mud.yahoo.com with SMTP; 14 Jul 2009 21:27:56 -0000 X-Yahoo-SMTP: APVNTmmswBB1ajQe0.MR1eIpHqOdoGKpEnK7HtPhl2t5AIcci3nTdw-- X-YMail-OSG: VouyEycVM1lU6aMZsxh.nji5LATxjaytwgEX_5I3gpVknEFBnxAIkeq22FLmLz57_0nJEj2yaKHQ137w4SazbDdX2cIcp71S9KbVb2pvyzmsyFVkEvIzwRblYURyanaGJdNwxQjbYAaiPWx1MetJ0ssSMCQ67lz842VY8PX27STICmpSXXHIbelTyiWCciHuwXMGJr_h_s.Mwd3wsKpXNqMPam.L2fjYlmyoMmvuhKVKH0F1LKerEPmJolaOm883OK3p3OvSYnaqq2iMkBDU12c7gc0Rx38FYrRPG9DMno.LzxbaAFnuSdv0T.wIwxJxAkJFS9mRHqiTeLr8MTMGcKdqxLOw.Zl45z0a7N0t X-Yahoo-Newman-Property: ymail-3 Message-ID: <330FD012C06148C5A348EDA5928E5CA5@lindavideo> From: "Ken" To: References: <1EDB89E6D3E24E008B4897CFE896A09F@lindavideo> <000301ca04b9$3fdbc9f0$0217aac0@jimdesk> <59B43DAF72704927B6E58971E3B9D56A@lindavideo> <000e01ca04bd$5b441900$0217aac0@jimdesk> Date: Tue, 14 Jul 2009 22:27:53 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5512 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 DomainKey-Status: good (testing) Subject: LF: Re: RE: Re: RE: Microwave oven transformers Content-Type: multipart/alternative; boundary="----=_NextPart_000_0033_01CA04D2.542C40B0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: ** X-Spam-Status: No, hits=2.3 required=5.0 tests=EXCUSE_16,FORGED_MUA_OUTLOOK, HTML_60_70,HTML_FONTCOLOR_BLUE,HTML_FONTCOLOR_UNKNOWN, HTML_FONTCOLOR_UNSAFE,HTML_FONT_BIG,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-IP: 193.82.116.20 ------=_NextPart_000_0033_01CA04D2.542C40B0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Jim. Ok Jim. I took your comments in good faith, once you get in the realms= of 2KV one does need to be very careful. I will keep you posted with= progress, the first task is to have the PA working with 1200V, then= move on to 2KV. Regards Ken 73deM0KHW =20 ----- Original Message -----=20 From: James Cowburn=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Tuesday, July 14, 2009 8:57 PM Subject: LF: RE: Re: RE: Microwave oven transformers Sorry Ken,=20 =20 I did not mean to trivialize or be facetious but microwave transform= ers do have a reputation for biting. I will refrain from further obvi= ous comments!! J =20 =20 With best regards =20 =20 Jim =20 =20 Dr. James Cowburn 26 Birch Close Broom Biggleswade Beds SG18 9NR =20 T +44 (0) 1767 600522 M+44 (0) 7967 300152 E james.cowburn@virgin.net =20 "The information transmitted is intended only for the person to whom= it is addressed and may contain confidential and/or privileged materi= al. If you are not the intended recipient, you are hereby notified tha= t you must not read this message. Any review, retransmission, dissemination or other use of, or taking= of any action in reliance upon, this information by persons or entiti= es other than the intended recipient is prohibited. Consequently, thi= s email is not intended to be contractually binding. If you received this in error, please contact the sender, return the= message as well as its attachments and delete the whole from any comp= uter." =20 ----------------------------------------------------------------------= -------- From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group= @blacksheep.org] On Behalf Of Ken Sent: 14 July 2009 20:34 To: rsgb_lf_group@blacksheep.org Subject: LF: Re: RE: Microwave oven transformers =20 Jim. There will probably be a fair bit of technical smoke comimg out of= Luton, but that is what our hobby is all about, any other usefull sug= estions? =20 Krgards. Ken 73deM0KHW ----- Original Message -----=20 From: James Cowburn=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Tuesday, July 14, 2009 8:28 PM Subject: LF: RE: Microwave oven transformers =20 Tesla Roulette!! =20 With best regards =20 =20 Jim =20 =20 Dr. James Cowburn 26 Birch Close Broom Biggleswade Beds SG18 9NR =20 T +44 (0) 1767 600522 M+44 (0) 7967 300152 E james.cowburn@virgin.net =20 "The information transmitted is intended only for the person to wh= om it is addressed and may contain confidential and/or privileged mate= rial. If you are not the intended recipient, you are hereby notified= that you must not read this message. Any review, retransmission, dissemination or other use of, or taki= ng of any action in reliance upon, this information by persons or enti= ties other than the intended recipient is prohibited. Consequently,= this email is not intended to be contractually binding. If you received this in error, please contact the sender, return= the message as well as its attachments and delete the whole from any= computer." =20 ----------------------------------------------------------------------= ------ From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_gro= up@blacksheep.org] On Behalf Of Ken Sent: 14 July 2009 20:22 To: rsgb_lf_group@blacksheep.org Subject: LF: Microwave oven transformers =20 Hello everyone. Does any one have experience in using microwave oven transformers= in high voltage power units, I acquired two of these at the weekend.= I was informed that as they stand the voltage regulation is poor, to= improve this the 'Core Shunts' should be removed, (these are laminati= ons between the two stacks), removal of these 'shunts' also has the ef= fect of considerably increasing the magnetisation current. The solutio= n to this seems to be to use two transformers, connecting the both pri= maries and secondary's in series to restore the 2KV output voltage. =20 Any comments on this most welcome =20 Note for Mal, this is serious stuff not for appliance operators. =20 Regards Ken Wright =20 73 de M0KHW ------=_NextPart_000_0033_01CA04D2.542C40B0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Jim.
Ok Jim. I took your comments in good= faith, once=20 you get in the realms of 2KV one does need to be very careful. I will= keep you=20 posted with progress, the first task is to have the PA working with 12= 00V, then=20 move on to 2KV.
Regards
Ken
 
73deM0KHW  
----- Original Message -----
Sent: Tuesday, July 14, 2009= 8:57=20 PM
Subject: LF: RE: Re: RE: Micr= owave oven=20 transformers

Sorry= Ken,=20

&= nbsp;

I did= not mean to=20 trivialize or be facetious but microwave transformers do have a repu= tation for=20 biting.  I will refrain from further obvious comments!! = =20 J

&= nbsp;

&= nbsp;

With= best=20 regards

 

 

Jim

 

 

Dr. Ja= mes=20 Cowburn

26 Bir= ch=20 CloseBroom<= /SPAN><= /o:p>

Biggle= swade=

Beds

SG18= =20 9NR=

 

T +44= (0) 1767=20 600522

M+44= (0) 7967=20 300152

E james.cowburn@virgin.net=

 

=93The=20 information transmitted is intended only for the person to whom it= is=20 addressed and may contain confidential and/or privileged material.= If you are=20 not the intended recipient, you are hereby notified that you must no= t read=20 this message.
Any review, retransmission, dissemination or other= use of, or=20 taking of any action in reliance upon, this information by persons= or entities=20 other than the intended recipient is prohibited.  Consequently,= this=20 email is not intended to be contractually binding.
If you receive= d this in=20 error, please contact the sender, return the message as well as its= =20 attachments and delete the whole from any computer.=94=

 =

<= FONT size=3D3 face=3D"Times New Roman">

From:=20 owner-rsgb_lf_group@blacksheep.org=20 [mailto:owner-rsgb_lf_group@blackshe= ep.org] On= Behalf Of Ken
= Sent: 14 July 2009 20:34
To: rsgb_lf_group= @blacksheep.org
Subject: LF: Re: RE: Microwave oven=20 transformers

 

Jim.

=

There will probably be a fair bit= =20 of technical smoke comimg out of Luton, but=20 that is what our hobby is all about, any other usefull=20 sugestions?

 

Krgards.=

Ken

<= /DIV>

73deM0KHW

----- Original Message -----= =20

Sent:=20 Tuesday, July 14, 2009 8:28 PM

Subject= : LF: RE:=20 Microwave oven transformers

 

Tes= la=20 Roulette!!

 

Wit= h best=20 regards

 =

 =

Jim

 =

 =

Dr.= James=20 Cowburn

26= Birch=20 Close

Bro= om<= o:p>

Big= gleswade

Bed= s

SG1= 8=20 9NR

 =

T= +44 (0) 1767=20 600522

M+4= 4 (0) 7967=20 300152

E= james.cowburn@virgin.net

 =

=93The=20 information transmitted is intended only for the person to whom it= is=20 addressed and may contain confidential and/or privileged material.= If you=20 are not the intended recipient, you are hereby notified that you= must not=20 read this message.
Any review, retransmission, dissemination or= other use=20 of, or taking of any action in reliance upon, this information by= persons or=20 entities other than the intended recipient is prohibited. =20 Consequently, this email is not intended to be contractually bindi= ng.
If=20 you received this in error, please contact the sender, return the= message as=20 well as its attachments and delete the whole from any=20 computer.=94

 

Fro= m:=20 owner-rsgb_lf_group@blacksheep.o= rg=20 [mailto:owner-rsgb_lf_group@blac= ksheep.org] Sent: 14 July 2009 20:22
To: rs= gb_lf_group@blacksheep.org
Subject: LF: Microwave oven=20 transformers

 

Hello=20 everyone.

Does any one have experience= in=20 using microwave oven transformers in high voltage power units, I= acquired=20 two of these at the weekend. I was informed that as they stand the= voltage=20 regulation is poor, to improve this the 'Core Shunts' should be re= moved,=20 (these are laminations between the two stacks), removal of these= 'shunts'=20 also has the effect of considerably increasing the magnetisation= current.=20 The solution to this seems to be to use two transformers, connecti= ng the=20 both primaries and secondary's in series to restore the 2KV output= =20 voltage.

 

Any comments on this most=20 welcome

 

Note for Mal, this is serious= =20 stuff not for appliance operators.

 

Regards

Ken=20 Wright

 

73 de=20 M0KHW

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