Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mp04.r1000.mx.aol.com (Internet Inbound) with ESMTP id 22D6A380000A1; Thu, 28 Jun 2012 09:52:05 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1SkF7H-0005qA-Rs for rs_out_1@blacksheep.org; Thu, 28 Jun 2012 14:50:39 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1SkF7H-0005q1-Ch for rsgb_lf_group@blacksheep.org; Thu, 28 Jun 2012 14:50:39 +0100 Received: from smtpa1.mediabeam.com ([194.25.41.13] helo=smtpa2.mediabeam.com) by relay1.thorcom.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.77) (envelope-from ) id 1SkF7F-0002PP-D8 for rsgb_lf_group@blacksheep.org; Thu, 28 Jun 2012 14:50:38 +0100 Received: from IMAP4 (balancer7.mediabeam.com [10.100.1.80]) by smtpa2.mediabeam.com (8.13.8/8.13.1) with ESMTP id q5SDoZUA000406 for ; Thu, 28 Jun 2012 15:50:36 +0200 Date: Thu, 28 Jun 2012 15:50:34 +0200 From: uwe-jannsen@kabelmail.de To: rsgb_lf_group@blacksheep.org Message-ID: <0634396aac324c03b5cb37de421bffb0@kabelmail.de> X-Priority: 3 (Normal) MIME-Version: 1.0 X-Spam-Score: -0.7 (/) 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: and me too, Stefan tks in adv Uwe/dj8wx Von: rsgb_lf_group@blacksheep.org Gesendet: 28.06.2012 12:49 An: rsgb_lf_group@blacksheep.org Betreff: LF: Re: 472 kHz PA running at 12 VDC Stefan, me too, pse. 73 Walter DJ2LF [...] Content analysis details: (-0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [194.25.41.13 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 HTML_NONELEMENT_30_40 BODY: 30% to 40% of HTML elements are non-standard X-Scan-Signature: ab7de7439a3fce0b74220375dc6f18e8 Subject: Re: LF: Re: 472 kHz PA running at 12 VDC Content-Type: multipart/alternative; boundary="----D44055B3A3C542ABA4A868A66A5A6AC5" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.1 required=5.0 tests=HTML_MESSAGE,NO_REAL_NAME, PRIORITY_NO_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: 3039ac1dc1484fec618511d6 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none ------D44055B3A3C542ABA4A868A66A5A6AC5 Content-type: text/plain; charset=Windows-1252 Content-Transfer-Encoding: quoted-printable and me too, Stefan tks in adv Uwe/dj8wx Von: rsgb_lf_group@blacksheep=2Eorg Gesendet: 28=2E06=2E2012 12:49 An: rsgb_lf_group@blacksheep=2Eorg Betreff: LF: Re: 472 kHz PA running at 12 VDC Stefan, me too, pse=2E 73 Walter DJ2LF ----- Original Message -----=20 From: "Stefan Sch=E4fer"=20 To:=20 Sent: Thursday, June 28, 2012 12:33 AM Subject: LF: 472 kHz PA running at 12 VDC > MF, > > For the homebrewers, here is my prototype of a MF class D PA that op= erates=20 > at 12 V DC=2E Input frequency is divided by 4, so a normal HF TRX ca= n be=20 > used (set to 160m / 1=2E9 MHz) to drive the PA=2E The input power mu= st not=20 > exceed the range of 1=2E=2E=2E4 watts=2E The output power can be swi= tched in 2=20 > steps between ~15W and up to 100W, depending on the output impedance= and=20 > input voltage (10=2E=2E=2E15V)=2E The output impedance is not so cri= tical, Z=3DR may=20 > be in the range of 30 Ohm to infinity=2E The FETs are IRFZ48N types,= the=20 > driver is a ICL7667CPA=2E The transformer uses RF litz wire, 30x0=2E= 1mm=20 > diameter=2E I didn't spend to much effort for optimising the efficie= ncy, not=20 > at this power level=2E During a CW QSO or longer calls at 50 W RF po= wer the=20 > heat sink (which is just a 3mm thick Al plate) becomes hand warm=2E > The measured efficiency is 88 % at 18W RF power and 80% at 50W RF po= wer=2E=2E=20 > The needed power for the driver circuitry is included in this measur= ement=2E > > If someone is interested i may convert the circuit from my mind into= a=20 > schematic as a png file=2E > > 73, Stefan/DK7FC > > https://dl=2Edropbox=2Ecom/u/19882028/MF/DK7FC%20472%20kHz%20PA%2015= W%2B100W=2EJPG > > ------D44055B3A3C542ABA4A868A66A5A6AC5 Content-type: text/html; charset=Windows-1252 Content-Transfer-Encoding: quoted-printable
and me too, Stefan
tks in adv
Uwe/dj8wx
Von: rsgb_lf_group@blacksheep=2Eorg
Gesendet: 28=2E06=2E2012 12:49
An: rsgb_lf_group@blacksheep=2Eorg
Betreff: LF: Re: 472 kHz PA running at 12 VDC

Stefan,
me too, pse=2E
73
Walter DJ2LF

----- Original Message -----
From: "Stefan Schäfer"
To:
Sent: Thursday, June 28, 2012 12:33 AM
Subject: LF: 472 kHz PA running at 12 VDC


> MF,
>
> For the homebrewers, here is my prototype of a MF class D PA that = operates
> at 12 V DC=2E Input frequency is divided by 4, so a normal HF TRX = can be
> used (set to 160m / 1=2E9 MHz) to drive the PA=2E The input power = must not
> exceed the range of 1=2E=2E=2E4 watts=2E The output power can be s= witched in 2
> steps between ~15W and up to 100W, depending on the output impedan= ce and
> input voltage (10=2E=2E=2E15V)=2E The output impedance is not so c= ritical, Z=3DR may
> be in the range of 30 Ohm to infinity=2E The FETs are IRFZ48N type= s, the
> driver is a ICL7667CPA=2E The transformer uses RF litz wire, 30x0=2E= 1mm
> diameter=2E I didn't spend to much effort for optimising the effic= iency, not
> at this power level=2E During a CW QSO or longer calls at 50 W RF = power the
> heat sink (which is just a 3mm thick Al plate) becomes hand warm=2E=
> The measured efficiency is 88 % at 18W RF power and 80% at 50W RF = power=2E=2E
> The needed power for the driver circuitry is included in this meas= urement=2E
>
> If someone is interested i may convert the circuit from my mind in= to a
> schematic as a png file=2E
>
> 73, Stefan/DK7FC
>
> https://dl=2Edropbox=2Ecom/u/19882028/MF/DK7FC%20472%20kHz%20PA%20= 15W%2B100W=2EJPG
>
>


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