Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mg04.r1000.mx.aol.com (Internet Inbound) with ESMTP id 59389380000BF; Wed, 11 Jan 2012 09:29:46 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1RkzAU-00022a-RX for rs_out_1@blacksheep.org; Wed, 11 Jan 2012 14:28:46 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1RkzAU-00022R-Cp for rsgb_lf_group@blacksheep.org; Wed, 11 Jan 2012 14:28:46 +0000 Received: from rhcavuit01.kulnet.kuleuven.be ([134.58.240.129] helo=cavuit01.kulnet.kuleuven.be) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1RkzAS-0000Y3-AG for rsgb_lf_group@blacksheep.org; Wed, 11 Jan 2012 14:28:46 +0000 X-KULeuven-Envelope-From: rik.strobbe@fys.kuleuven.be X-KULeuven-Scanned: Found to be clean X-KULeuven-ID: 55AE013802B.A3707 X-KULeuven-Information: Katholieke Universiteit Leuven Received: from smtps02.kuleuven.be (smtpshost02.kulnet.kuleuven.be [134.58.240.75]) by cavuit01.kulnet.kuleuven.be (Postfix) with ESMTP id 55AE013802B for ; Wed, 11 Jan 2012 15:28:34 +0100 (CET) Received: from ICTS-S-HUB-N3.luna.kuleuven.be (icts-s-hub-n3.luna.kuleuven.be [10.112.9.13]) by smtps02.kuleuven.be (Postfix) with ESMTP id EFB4BF3863 for ; Wed, 11 Jan 2012 15:28:33 +0100 (CET) Received: from ICTS-S-EXC2-CA.luna.kuleuven.be ([10.112.11.13]) by ICTS-S-HUB-N3.luna.kuleuven.be ([10.112.9.13]) with mapi; Wed, 11 Jan 2012 15:28:34 +0100 X-Kuleuven: This mail passed the K.U.Leuven mailcluster From: Rik Strobbe To: "rsgb_lf_group@blacksheep.org" Date: Wed, 11 Jan 2012 15:27:56 +0100 Thread-Topic: QRP 1W /PA circuit Thread-Index: AczQXbzdoMnQHAOwTz6kIWxqDbPIUgAD3ldK Message-ID: References: <4F0CC679.2010206@charter.net>,<4F0D81E5.4010602@iup.uni-heidelberg.de> In-Reply-To: <4F0D81E5.4010602@iup.uni-heidelberg.de> Accept-Language: nl-NL, nl-BE Content-Language: nl-BE X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: nl-NL, nl-BE MIME-Version: 1.0 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: LF: RE: QRP 1W /PA circuit Content-Type: multipart/alternative; boundary="_000_BF4A524700075746A6467658DFC7102CB0B489A725ICTSSEXC2CAlu_" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_30_40,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: 1:2:423222720:93952408 X-AOL-SCOLL-URL_COUNT: 2 x-aol-sid: 3039ac1d60cc4f0d9cda0fa1 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none --_000_BF4A524700075746A6467658DFC7102CB0B489A725ICTSSEXC2CAlu_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Stefan, how do you drive the H-bridge amp ? 73, Rik ON7YD - OR7T ________________________________ Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org= ] namens Stefan Sch=E4fer [Stefan.Schaefer@iup.uni-heidelberg.de] Verzonden: woensdag 11 januari 2012 13:34 Aan: rsgb_lf_group@blacksheep.org Onderwerp: LF: QRP 1W /PA circuit LF, Last night i shot my PA again :-( No replacement FETs were available so i h= ad to stay quite during the night. Replacement parts are ordered now and wi= ll arrive tomorrow :-) During that time i will run a LF beacon on 136.172 kHz running 1W TX power = in DFCW-90, starting in the afternoon. If someone can receive that weak QRP= P signal, then a report is very apprechiated :-) Also i will do some optimisations on my recently posted PA output stage (ht= tp://dl.dropbox.com/u/19882028/LF/DK7FC_137kHz_TX_antenna_and_PA_schematic.= jpg), just in case someone wants to build a similar design and is intereste= d in general: -R=3D 100 Ohm/2W (In series with C, across Drain-Source) -C=3D 220pF/WIMA FKP-1 2kV (In series with R, across Drain-Source) -MOSFET: The IRFP460 will be replaced by a SPW20N60C3 :-) 73, Stefan/DK7FC --_000_BF4A524700075746A6467658DFC7102CB0B489A725ICTSSEXC2CAlu_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Stefan,
 
how do you drive the H-bridge a= mp ?
 
73, Rik  ON7YD - OR7= T
=  
Van: owner-rsgb_l= f_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org] namens Stefan S= ch=E4fer [Stefan.Schaefer@iup.uni-heidelberg.de]
Verzonden: woensdag 11 januari 2012 13:34
Aan: rsgb_lf_group@blacksheep.org
Onderwerp: LF: QRP 1W /PA circuit

LF,

Last night i shot my PA again :-( No replacement FETs were available so i h= ad to stay quite during the night. Replacement parts are ordered now and wi= ll arrive tomorrow :-)

During that time i will run a LF beacon on 136.172 kHz running 1W TX = power in DFCW-90, starting in the afternoon. If someone can receive= that weak QRPP signal, then a report is very apprechiated :-)

Also i will do some optimisations on my recently posted PA output stage (http://dl= .dropbox.com/u/19882028/LF/DK7FC_137kHz_TX_antenna_and_PA_schematic.jpg= ), just in case someone wants to build a similar design and is interested in = general:

-R=3D 100 Ohm/2W (In series with C, across  Drain-Source)
-C=3D 220pF/WIMA FKP-1 2kV  (In series with R, across Drain-Source) -MOSFET: The IRFP460 will be replaced by a SPW20N60C3 :-)

73, Stefan/DK7FC
--_000_BF4A524700075746A6467658DFC7102CB0B489A725ICTSSEXC2CAlu_--