Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-df04.r1000.mx.aol.com (Internet Inbound) with ESMTP id 5CA2A3800008B; Fri, 29 Jun 2012 07:32:57 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1SkZQC-0001SJ-Aj for rs_out_1@blacksheep.org; Fri, 29 Jun 2012 12:31:32 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1SkZQB-0001SA-0A for rsgb_lf_group@blacksheep.org; Fri, 29 Jun 2012 12:31:31 +0100 Received: from nm11.bullet.mail.ird.yahoo.com ([77.238.189.64]) by relay1.thorcom.net with smtp (Exim 4.77) (envelope-from ) id 1SkZQ7-0003Nf-93 for rsgb_lf_group@blacksheep.org; Fri, 29 Jun 2012 12:31:29 +0100 Received: from [77.238.189.234] by nm11.bullet.mail.ird.yahoo.com with NNFMP; 29 Jun 2012 11:31:26 -0000 Received: from [212.82.108.242] by tm15.bullet.mail.ird.yahoo.com with NNFMP; 29 Jun 2012 11:31:26 -0000 Received: from [127.0.0.1] by omp1007.mail.ird.yahoo.com with NNFMP; 29 Jun 2012 11:31:26 -0000 X-DKIM-Result: Domain=yahoo.co.uk Result=Good and Known Domain X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 55227.536.bm@omp1007.mail.ird.yahoo.com Received: (qmail 38624 invoked by uid 60001); 29 Jun 2012 11:31:25 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.co.uk; s=s1024; t=1340969485; bh=iTrTKs9jAO++ZVsibBrPdjJU0qAOcKmCWOuq1Cpz6f8=; h=X-YMail-OSG:Received:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=P90SVPetUpZG4sOlRk16CPDdlP/3XN8K3hbNBp1y36gatbLOTveyMiAC+MAen0ie/iJfg7aTlemmO7BgSSt1vMdBLabbT0U1tjnOJ6mRT0L4LoUhLJHKUrKlKtjiMhDh5gEeXCn3SXH0wLPD9MqzKmb4kCk+D3U9K/qFRjzwtWg= DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.co.uk; h=X-YMail-OSG:Received:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=DDERmufrz3NicBrujuJY8b5XEHPWxco3FpaD/c4NKyCy0qzD6TPFD9dFnyeSC0Raoc6O8oa8pHIKisVGw84JOTvAntcUSQMBRzC1pqU6LqY2n5yxj14zNFTYTxgeaqmYfn8Og10pEoBriaoXN6W/eyI8hOy4l2AfMQiD5dIlin4=; X-YMail-OSG: wugIWfMVM1koUo.qVGCdPD.uTy9jIMfZM9DydnCl9kKJayU YVdmcgwLUpXYbQjGrRr9z3fFPm0kkM.36Iigl742RxUuHI56n5Y0BrYwCQnf 4azeIiR3D.nCt7SGdidM8xlffY952kCHRejHjTtxcqVcotlli5yIixPclUjs OpZDqz5Z2L4F5rnYxH626DacKhg8wN9NxDyGrKoylNfhYpNB01o4CQsgdHL1 99FG_akB.2zEi0cyU91IOrDCGXXPVMBHyWK56jyEPq8VmMhOSXzN3aXFZvZv qVJa8NZSDs0x04Y6Ow2kfilPJhVJImeJ1eWTXBptQhvIXAM2p3dTSPihHPZL dg8Q2FaZbz4uE8l8Xyd47ay8lMrehinaEMioWj7QDog9RDa29FJ7m5JDGx3e zdVuZs2MF34zoRguo4Q0nGGJwdzixVv2SUuc0BDGMaAZqX76VZ.2HE.7MAk2 ZXY1WQXDB8exuOj05Myt1C1epd4MKShmsuadpyMGbhfHZ06wiYXnU6Z.Uj42 qTaPpcCju6Ergsnq3RcK54AYKOY0aFtcpig.TDqHnzZ.h3FirBBhmyC9co3L 7blHZDM01pw_.9303eaDG1dF_S5O2N1r7oWvua1MtKf3x7.U8VcOI4vN5T8S HXX6bcXgkH9O3RZGJzb_sk58OHqjOb1nUcIXuG9O7ARGAgtAM3B80DFaVA.E 9cwDU72qYSJ.vvAf4ztmsdMUueDm.yktmlhGFNiafv2eKqeRfz2TsbFE2MCf Bn4DEJr71Dz4MqfS50WoWHxKn1Jbquggt0H60eN7iw1Hhg7es8UJZ9oOp8iS 2tfln9R4W6mTneTburNIus0riQHExUnJCjlHiXg0C2xjJQsoedkAa1U2q30j 81xMhCkbC4hYazqlgGdhz99EJhvwvm7xHSZzd49cJmezfJa0Men_myq1qS1k Fwy4Oshnxy4m5RRh2iIHBALpDz2u5vdl3OiIlWkaLYpw5klGw3VsM5q6o Received: from [86.163.214.230] by web171603.mail.ir2.yahoo.com via HTTP; Fri, 29 Jun 2012 12:31:25 BST X-Mailer: YahooMailWebService/0.8.118.349524 References: <4FEB8A2F.3030504@iup.uni-heidelberg.de> <7E7DFBB4D102A04DB5ADC88D66628A4A0FAB65D1@ICTS-S-MBX5.luna.kuleuven.be> <82ECFF6D94B94BED9D93B5580549A409@Extensa> <1340872602.49196.YahooMailNeo@web171602.mail.ir2.yahoo.com> <4FEC18F4.9050608@online.fr> <1340875355.96079.YahooMailNeo@web171602.mail.ir2.yahoo.com> <1340876781.29716.YahooMailNeo@web171601.mail.ir2.yahoo.com> <4FEC7DDF.8050906@iup.uni-heidelberg.de>,<1340908899.62897.YahooMailNeo@web171605.mail.ir2.yahoo.com> <7E7DFBB4D102A04DB5ADC88D66628A4A0FAB71D7@ICTS-S-MBX5.luna.kuleuven.be> Message-ID: <1340969485.35762.YahooMailNeo@web171603.mail.ir2.yahoo.com> Date: Fri, 29 Jun 2012 12:31:25 +0100 (BST) From: M0FMT To: "rsgb_lf_group@blacksheep.org" In-Reply-To: <7E7DFBB4D102A04DB5ADC88D66628A4A0FAB71D7@ICTS-S-MBX5.luna.kuleuven.be> MIME-Version: 1.0 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 Rik  Many thanks for your very useful information. I hope others find this as well. Yes I said in an earlier mail what the PA and driver would cost from E-bay (my supplier of choice... :o)) but at least they are obtainable.  The current hold are the Ferrites or the Iron Dust toriods. This is the usual problem because one black iron ring looks very much like another. Once you have it in your hands you can do a test. What I do is to put a few turns on an unknown core and measure the inductance then compare the results with the theoretical value obtained from a range of cores with the same dimensions using "Mini Core" SW. At the moment I have a source for the T1 core but not the choke. And surprisingly I can't find the T80-2s they were every where once upon a time. Anyway I do have a variety of cores that will probably do for the O/P filtre. One day I will find a design I can kit perfectly.  I like your transverter, I am getting torn between projects right now. Q6 / Q7 driver as you say can be reproduced for each FET gate cheaply in fact I have the parts!  I will now crawl into my cave and start to build. Thanks to you and Stefan. [...] 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 [77.238.189.64 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (m0fmt[at]yahoo.co.uk) 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 FSL_FREEMAIL_1 FSL_FREEMAIL_1 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 3d57f46aaa11dced1062afcdaf02fb40 Subject: Re: LF: Re: RE: 472 kHz PA running at 12 VDC Content-Type: multipart/alternative; boundary="-357169082-633832833-1340969485=:35762" 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_BLUE, HTML_FONT_BIG,HTML_MESSAGE,TO_ADDRESS_EQ_REAL 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-SCORE: 1:2:508810688:93952408 X-AOL-SCOLL-URL_COUNT: 1 X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-d008.2 ; domain : yahoo.co.uk DKIM : fail x-aol-sid: 3039ac1d40d84fed92694e41 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none ---357169082-633832833-1340969485=:35762 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi Rik=0A=C2=A0=0AMany thanks for your very useful information. I hope othe= rs find this as well.=0AYes I said in an earlier mail what the PA and drive= r would cost from E-bay (my supplier of choice... :o)) but at least they ar= e obtainable.=0A=C2=A0=0AThe current hold are=C2=A0the Ferrites or the Iron= Dust toriods. This is the usual problem because one black iron ring looks = very much like another. Once you have it in your hands you can do a test. W= hat I do is to put a few turns on an unknown core and measure the inductanc= e then compare the results with the theoretical value obtained from a range= of cores with the same dimensions using "Mini Core" SW.=C2=A0At the moment= I have a source for the T1 core but not the choke. And surprisingly I can'= t find the T80-2s they were every where once upon a time. Anyway I do have = a variety of cores that will probably do for the O/P=C2=A0filtre. One day I= will find a design I=C2=A0 can kit perfectly.=0A=C2=A0=0AI like your trans= verter, I am getting torn between projects right now. Q6 / Q7 driver as you= say can be reproduced for each FET gate cheaply in fact=C2=A0I have the pa= rts!=0A=C2=A0=0AI will now crawl into my cave and start to build. Thanks to= you and Stefan.=0A=0A73 es GL Pete M0FMT IO91UX=0A=0A=0A__________________= ______________=0A From: Rik Strobbe =0ATo: "rs= gb_lf_group@blacksheep.org" =0ASent: Friday,= 29 June 2012, 8:49=0ASubject: RE: LF: Re: RE: 472 kHz PA running at 12 VDC= =0A=C2=A0 =0A=0A =0AHello=C2=A0Pete, =0A=C2=A0 =0AI=C2=A0assume=C2=A0that = the more=C2=A0exotic=C2=A0parts are the power=C2=A0FET (IRFZ48N) and the=C2= =A0driver IC (ICL7667). =0AThe=C2=A0IRFZ48N is a=C2=A055V /=C2=A064A / 0.01= 4 Ohm device. For a=C2=A0first=C2=A0try=C2=A0you=C2=A0could=C2=A0replace=C2= =A0it=C2=A0by=C2=A0far more=C2=A0common=C2=A0IRF460=C2=A0that is=C2=A0100V = /=C2=A028A / 0.06 Ohm. =0AA bit of=C2=A0reverse engineering: Stefan=C2=A0st= ates=C2=A050W output at 80% efficiency =3D=C2=A062.5W input =3D=C2=A05.2A a= t 12V. =0ASo=C2=A0with a=C2=A028A=C2=A0device=C2=A0you are=C2=A0on the safe= side. =0AThe=C2=A0larger Ron (0.06 Ohm=C2=A0vs 0.014 Ohm)=C2=A0will (in th= eory)=C2=A0reduce the efficiency.=C2=A0But=C2=A05.2A in 0.014 Ohm is=C2=A0o= nly=C2=A0about=C2=A00.4W loss (for a IRFZ48N). For a=C2=A0IRF460=C2=A0it is= =C2=A05.2A in 0.06 Ohm =3D=C2=A01.6W loss. =0ASo=C2=A0the=C2=A0losses (12.5= W) are=C2=A0probably more=C2=A0due to the non perfect=C2=A0switching=C2=A0t= han=C2=A0due to the Ron of the FETs. =0AAn=C2=A0alternative=C2=A0for the=C2= =A0ICL7667 is a=C2=A0TC4426=C2=A0or a=C2=A0homebrew=C2=A0driver (see http:/= /www.pa3bca.nl/images/stories/500KHz/500khz_transverter_full.gif/images/sto= ries/500KHz/500khz_transverter_full.gif). =0A=C2=A0 =0A73, Rik=C2=A0=C2=A0O= N7YD - OR7T =0A=C2=A0 =0A=0A________________________________=0A =0AVan: own= er-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org] namens= M0FMT [m0fmt@yahoo.co.uk]=0AVerzonden: donderdag 28 juni 2012 20:41=0AAan:= rsgb_lf_group@blacksheep.org=0AOnderwerp: Re: LF: Re: RE: 472 kHz PA runni= ng at 12 VDC=0A=0A =0AHi Stefan =0A=C2=A0 =0AI like this and would like to= make to make it. I so far have tracked down most bits but as usual the Uno= btainium of so many construction projects that fall at the last hurdle unle= ss they are Kits........ no chance of that I suppose? =0A=C2=A0 =0AThere wi= ll be those who tell me its easy to get the bits=C2=A0but unless you work f= or a company that uses this stuff it can not be slipped through the "Purcha= sing"=C2=A0it becomes a positive stop!! =0ALike the Litz I just put that i= n one of our big outfits with min orders and it said it had over one hundre= d thousand Litz and promptly collapsed. But they have one of the toroids (T= 1) wow and its not a min order either double wow! Litz can be fabricated fr= om 0.125 Cu/En?=C2=A0 Hmm it's plaited ? =0AWima caps are available from Ma= plin haven't checked in depth but they usually are. =0A=C2=A0 =0AI like the= idea of using a DDS or Transceiver as a master osc source div. by four. = =0A=C2=A0 =0AGenerally=C2=A0I buy my power FETs by the hand full off E-bay = they may not be ideal but are cheap!! 50P (eer 60Ec) (Never mind the qualit= y but feel the width... principle)=C2=A0and the drivers TC range for slight= ly more. =0A=C2=A0 =0AI'll keep searching for a bit but if anyone has a kit= ting list (UK source) may be they could publish it?=C2=A0 =0A=C2=A0 =0AAnd = thanks Stefan nothing under the Sun is "New" but in context it is new and w= orth while thanks!=0A =0A73 es GL Pete M0FMT IO91UX=0A=0A=C2=A0=0A_________= _______________________=0A From: Stefan Sch=C3=A4fer =0ATo: rsgb_lf_group@blacksheep.org =0ASent: Thursday, 28 = June 2012, 16:53=0ASubject: Re: LF: Re: RE: 472 kHz PA running at 12 VDC=0A= =0A=0AHi MF, =0A=0ALate at night, i made draw the schematic. Here it is: h= ttps://dl.dropbox.com/u/19882028/MF/100W%20475kHz%20PA.png=C2=A0 (picture o= f prototype https://dl.dropbox.com/u/19882028/MF/DK7FC%20472%20kHz%20PA%201= 5W%2B100W.JPG)=0A=0AMost of the parts are not critical. =0A=0AThe ferrite c= ores are the blue EPCOS types, N30 material. Details are in the image. But = you may use a FT140-77 alternatively and double the primary and secondary n= umber of turns.=0A=0AThere are many alternatives, also to the FETs. Instead= of the IRZF48N you may try a IRF1405. This one has a lower on-resistance b= ut a higher input capacity. Maybe it works even better, i didn't try to man= y parts. Switching times are not critical. So you need to find a compromise= between low on resistance and input capacity while the Drain-Source voltag= e should be 55V for a 12V supply.=0A=0AInstead of RF litz wire (i use this = one: http://www.reichelt.de/index.html?ACTION=3D3;ARTICLE=3D57206;SEARCH=3D= CLI%20200%2F30 ) you can also use 1mm diam. enamel. Cu wire or better 5x0.4= mm or what you have. It just affects the efficiency, more or less.=0A=0AThe= overall dimensions of this prototype are 15cm x 10cm x 3cm, so it is quite= compact and since it runs from a 12V battery you can use it for /p tests. = Also you can of course use more than 2 power steps by using a multi step sw= itch and more taps.=0A=0AA DDS signal generator with rectangular wave form = or a sine signal coming from a HF TX may be used. The waveform doesn't matt= er as long as the peak input voltage exceeds 5 Vp.=0A=0A73, Stefan/DK7FC=0A= =0APS: Yes, it is nothing new and someone has done it before!=0A=0A=0A=0A= =0A=0A=0AAm 28.06.2012 11:46, schrieb M0FMT: =0AHi again Stefan =0A>=C2=A0 = =0A>The Litz is too, only by the Km or 10Kg reel.......... :@(( =0A>=0A>Do = you create your own I have 0.125 solid C/E guess that could be stranded up = to make a synth? =0A>=0A>=C2=A0 =0A>73 es GL Pete M0FMT IO91UX=0A>=0A>From:= M0FMT mailto:m0fmt@yahoo.co.uk=0A>To: mailto:rsgb_lf_group@blacksheep.org = mailto:rsgb_lf_group@blacksheep.org =0A>Sent: Thursday, 28 June 2012, 10:22= =0A>Subject: Re: LF: Re: RE: 472 kHz PA running at 12 VDC=0A> =0A>=0A>Hi St= efan =0A>http://www.ebay.co.uk/itm/IRFZ24N-Transistor-x-1-pieces-IRFZ24-/16= 0818253496?pt=3DUK_BOI_Electrical_Components_Supplies_ET&hash=3Ditem257183c= eb8 =0A>Just over =C2=A35 a pop! =0A>http://www.ebay.co.uk/itm/NEW-ICL7667C= PA-MAXIM-IC-DRIVER-MOSFET-DUAL-PWR-8-DIP-1-PIECE-B7-/160779362423?pt=3DLH_D= efaultDomain_0&hash=3Ditem256f326077 =0A>Just over =C2=A36 a pop! =0A>But w= hat is the =E2=80=9CUnobtainium=E2=80=9D ferrite?=C2=A0=C2=A0 =E2=80=A6=E2= =80=A6 ;0) =0A>Chees Pete FMT =0A>=C2=A0=C2=A0 From: Jean-Pierre M=C3=A9r= =C3=A9 mailto:jpm.f1afj@online.fr=0A>To: rsgb_lf_group@blacksheep.org =0A>S= ent: Thursday, 28 June 2012, 9:42=0A>Subject: Re: LF: Re: RE: 472 kHz PA ru= nning at 12 VDC=0A> =0A>=0A>=0A>Hello Stephan ,=0A>Me too =0A>73=C2=A0 , Je= an-Pierre F1AFJ=C2=A0 =0A>=0A>=0A>=0A>=0A>Le 28/06/2012 10:36, M0FMT a =C3= =A9crit=C2=A0:=0A> =0A>Hi Stephan =0A>>=0A>>Me Too=0A>>=0A>> =0A>>73 es GL = Pete M0FMT IO91UX=0A>>=0A>>From: "PA1SDB, Peter" mailto:pa1sdb@amsat.org=0A= >>To: rsgb_lf_group@blacksheep.org =0A>>Sent: Thursday, 28 June 2012, 9:12= =0A>>Subject: LF: Re: RE: 472 kHz PA running at 12 VDC=0A>> =0A>>=0A>> =0A>= >like =0A>>=0A>>----- Original Message ----- =0A>>>From: Rik Strobbe =0A>= >>To: rsgb_lf_group@blacksheep.org =0A>>>Sent: Thursday, June 28, 2012 6:3= 5 AM =0A>>>Subject: LF: RE: 472 kHz PA running at 12 VDC =0A>>>=0A>>> =0A>>= >If=C2=A0someone is=C2=A0interested i=C2=A0may=C2=A0convert the circuit=C2= =A0from=C2=A0my=C2=A0mind=C2=A0into a schematic as a=C2=A0png file. =0A>>>= =0A>>>Always=C2=A0interested ;-) =0A>>>=0A>>>73, Rik=C2=A0=C2=A0ON7YD - OR7= T =0A>>=0A>> =0A>=0A> =0A>=0A> =0A>=0A> ---357169082-633832833-1340969485=:35762 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Hi Rik
=
 
Many thanks for your very useful i= nformation. I hope others find this as well.
Yes I s= aid in an earlier mail what the PA and driver would cost from E-bay (my sup= plier of choice... :o)) but at least they are obtainable.
=  
The current hold are the Ferrites = or the Iron Dust toriods. This is the usual problem because one black iron = ring looks very much like another. Once you have it in your hands you can d= o a test. What I do is to put a few turns on an unknown core and measure th= e inductance then compare the results with the theoretical value obtained f= rom a range of cores with the same dimensions using "Mini Core" SW. At= the moment I have a source for the T1 core but not the choke. And surprisingly I can't find the T80-2s they were= every where once upon a time. Anyway I do have a variety of cores that wil= l probably do for the O/P filtre. One day I will find a design I = can kit perfectly.
 
I = like your transverter, I am getting torn between projects right now. Q6 / Q= 7 driver as you say can be reproduced for each FET gate cheaply in fact&nbs= p;I have the parts!
 
I will n= ow crawl into my cave and start to build. Thanks to you and Stefan.
 
73 es GL Pete M0FMT IO91UX
From:<= /b> Rik Strobbe <Rik.Strobbe@fys.kuleuven.be>
To: "rsgb_lf_group@blacksheep.org" <rsgb_l= f_group@blacksheep.org>
Sent:= Friday, 29 June 2012, 8:49
Subject: RE: LF: Re: RE: 472 kHz PA running at 12 VDC
&= nbsp;

=0A=0A =0A=0A=0A
=0A
=0AHello=  Pete,
=0A
 
=0A
I assume that= the more exotic parts are the power FET (IRFZ48N) and the driver IC (ICL7667<= /a>).
=0A
The IRFZ48N is a 55V / 6= 4A / 0.014 Ohm device. For a first try=  you could replace it by far mor= e common IRF460 that is 100V= / 28A= =0A / 0.06 Ohm.
=0A
A bit of reve= rse engineering: Stefan states 50W out= put at 80% efficiency =3D 62.5W inpu= t =3D 5.2A at 12V.
=0A
So with a 28A device you are&nbs= p;on the safe side.
=0A
The larger Ron (0.06 Ohm vs 0.014 Ohm) will (in theory) reduce the efficiency. But 5.2A in 0.014 Ohm is only about 0.4W loss (for a= IRFZ48N). For a IRF460 it=0A is = 5.2A in 0.06 Ohm =3D 1.6W loss.
=0A
So the losses<= a href=3D"" rel=3D"nofollow"> (12.5W)= are probably more due to the non perfect switching than due to the Ron of the FETs.
=0A
An alternative for the ICL7667<= a href=3D"" rel=3D"nofollow"> is a TC4426 or a homebrew driver (= see=0Ahttp://www.pa3bca.nl/images/stories/500KHz/500khz_transverter_full.= gif/images/stories/500KHz/500khz_transverter_full.gif).=0A
 
=0A
73,= Rik  ON7YD - OR7T
=0A
 =0A
=0A
=0A
Van: owner-rsgb_lf_group@blacksheep.org [o= wner-rsgb_lf_group@blacksheep.org] namens M0FMT [m0fmt@yahoo.co.uk]
=0A<= b>Verzonden: donderdag 28 juni 2012 20:41
=0AAan: rsgb_lf_gro= up@blacksheep.org
=0AOnderwerp: Re: LF: Re: RE: 472 kHz PA runnin= g at 12 VDC
=0A
=0A
=0A
=0A
=0A
=0A
Hi Stefan<= /div>=0A
 
=0A
I like this and would like to make to make it. I so far h= ave tracked down most bits but as usual the=0AUnobtainium of so many constructio= n projects that fall at the last hurdle unless they are Kits........ no cha= nce of that I suppose?
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There will be thos= e who tell me its easy to get the bits but unless you work for a compa= ny that uses this stuff it can not be slipped through the "Purchasing" = ;it becomes a positive stop!!=0A
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Like the Litz I just put that in one of our big outfits with min orders = and it said it had over one hundred thousand=0ALitz and promptly =0Acollapsed. But they have one of= the =0Atoro= ids (T1) wow and its not a min order either double wow! =0ALitz can be fabricated from 0.125= Cu/En? =0AHmm it's plaited ?
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Wima<= /span> caps are available from=0AMaplin haven't checked in depth but they usual= ly are.
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&nb= sp;
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I like the idea of using a DDS or <= span id=3D"yiv459361049misspell-10">=0ATransceiver as a= master osc= source div. by four.
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Generally = ;I buy my power =0AFETs by the hand full off E-bay they may not be ideal but ar= e cheap!! 50P (eer 60Ec) (Never mind the quality but feel the width... principle)&n= bsp;and the drivers TC range=0A for slightly more.
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I'll keep s= earching for a bit but if anyone has a kitting list (UK source) may be they= could publish it? 
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And thanks Stefan nothing under the Sun is "= New" but in context it is new and worth while thanks!
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73 es GL Pete M0FMT IO91UX
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= =0AFrom: Stefan =0ASch=C3=A4fer <Stefan.Schaefer@iup.uni-heidelberg.de>
=0ATo: rsgb_lf_group@blacksheep.org
=0ASent: Thursday, 28 June 2012, 1= 6:53
=0ASubject: Re: LF= : Re: RE: 472 kHz PA running at 12=0AVDC
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Hi MF,
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=0ALate at night, i made draw the s= chematic. Here it is: =0Ahttps://dl.dropbox.com/u/19882028/MF/100W%20475= kHz%20PA.png  (picture of prototype=0A=0Ahttps:/= /dl.dropbox.com/u/19882028/MF/DK7FC%20472%20kHz%20PA%2015W%2B100W.JPG)<= br>=0A
=0AMost of the parts are not critical.
=0A
=0AThe ferrite = cores are the blue EPCOS types, N30 material. Details are in the image. But you= may use a FT140-77 alternatively and double the primary and secondary numb= er of turns.
=0A
=0AThere are many alternatives, also to the FETs. Instea= d of the=0A= IRZF48N you may try a =0AIRF1405. This one has a lower on-resistance but= a higher input capacity. Maybe it works even better, i didn't try to many = parts. Switching times are not critical. So you need to find a compromise b= etween low on resistance and input capacity while the=0A Drain-Source volta= ge should be 55V for a 12V supply.
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=0AInstead of RF litz wire (i use = this one:=0A=0Ahttp://www.reichelt.de/index.html?= ACTION=3D3;ARTICLE=3D57206;SEARCH=3DCLI%20200%2F30 ) you can also use 1= mm diam. enamel. Cu wire or better 5x0.4mm or what you have. It just affect= s the efficiency, more or less.
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=0AThe overall dimensions of this= prototype are 15cm x 10cm x 3cm, so it is quite compact and since it runs = from a 12V battery you can use it for /p tests. Also you can of course use = more than 2 power steps by using a=0Amulti step switch and more taps.
=0A=0AA DDS signal generator with rectangular wave form or a sine signal comi= ng from a HF TX may be used. The waveform doesn't matter as long as the pea= k input voltage exceeds 5=0AVp.
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=0A73, Stefan/DK7FC
=0A
=0APS: Yes, it = is nothing new and someone has done it before!
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=0AAm 28.06.2012 11:46, schrieb M0FMT:=0A
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=0AHi again Stefan
=0A
 
=0AThe Litz is too, only by the Km or 10Kg reel.......... :@((=0A
 
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Do you create your own I have 0.125 solid C/E = guess that could be stranded up to make a=0Asynth?
=0A

=0A =0A
73 es GL Pete M0FMT IO91UX
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<= font size=3D"2" face=3D"Arial">From:<= /span> M0FMT=0A=0Amailto:m0fmt@yahoo.co.uk
=0ATo: =0Amailto:r= sgb_lf_group@blacksheep.org =0Amailto:rsgb_lf_= group@blacksheep.org
=0ASent:= Thursday, 28 June 2012, 10:22
=0ASubject: Re: LF: Re: RE: 472 kHz PA running at 12=0A<= span id=3D"yiv459361049misspell-40" class=3D"yiv459361049mark">VDC=0A
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Hi Stefan
=0A=0A
Just over =C2= =A35 a pop!
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Just ov= er =C2=A36 a pop!
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But what is the = =E2=80=9CUn= obtainium=E2=80=9D ferrite?  =0A=E2=80=A6=E2= =80=A6 ;0)
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Chees Pete FMT
=0A
 &= nbsp;=0AFrom: Jean-Pierre = M=C3=A9r=C3=A9 =0Amailto:jpm.f1afj@online.fr
=0ATo: =0Arsgb= _lf_group@blacksheep.org
=0AS= ent: Thursday, 28 June 2012, 9:42
=0ASubject: Re: LF: Re: RE: 472 kHz PA running at 12 = VDC
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Hello Stephan ,
=0AMe too
=0A73  , Jean-Pierre F= 1AFJ 
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Le 28/06/2012 10:36, M0FMT a =C3=A9crit :
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Hi Stephan
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Me Too
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=0A73 es GL Pete M0FMT IO91UX
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From: "PA1SDB, Peter"=0A=0Amailto:pa1sdb@amsat.org
=0ATo: =0A= rsgb_lf_group@blacksheep.org
=0ASent: Thursday, 28 June 2012, 9:12
=0ASubject: LF: Re: RE: 472 kHz PA running at 12 = VDC
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like
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----- Original Message ----- =0A=0A=0A
Sent: Thursd= ay, June 28, 2012 6:35 AM
=0A
Subject: LF: RE: 472 kH= z PA running at 12 VDC
=0A

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If someone is interested i may&nbs= p;convert the circuit from my mind into a schematic as = a png file.
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Always interested ;-)
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73, Rik  ON7YD - OR7T=
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