Return-Path: Received: (qmail 8301 invoked from network); 9 Jul 2001 19:14:20 -0000 Received: from unknown (HELO murphys-inbound.servers.plus.net) (212.159.14.225) by excalibur.plus.net with SMTP; 9 Jul 2001 19:14:20 -0000 Received: (qmail 8847 invoked from network); 9 Jul 2001 19:13:15 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys with SMTP; 9 Jul 2001 19:13:15 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 15JgJC-0008F1-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 09 Jul 2001 20:03:02 +0100 Received: from postfix2-2.free.fr ([213.228.0.140] ident=postfix) by post.thorcom.com with esmtp (Exim 3.16 #2) id 15JgJ9-0008Et-00 for rsgb_lf_group@blacksheep.org; Mon, 09 Jul 2001 20:02:59 +0100 Received: from rci (nas-cbv-6-8-133.dial.proxad.net [213.228.8.133]) by postfix2-2.free.fr (Postfix) with SMTP id B73A06B72F for ; Mon, 9 Jul 2001 21:02:12 +0200 (CEST) Message-ID: <003d01c108ab$2654b540$8508e4d5@rci> From: "f6kaw radio club d'ivry" To: rsgb_lf_group@blacksheep.org Subject: LF: lf: qrp tx update Date: Mon, 9 Jul 2001 21:12:49 +0200 MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.00.2615.200 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: ----- Original Message ----- From: Steve Rawlings To: f6kaw radio club d'ivry Sent: Sunday, July 08, 2001 8:27 AM Subject: QRP TX for 136 kHz > Hello Pascal! > > I have updated the web-site with my current VFO circuit. My > previous VFO circuit for the Marathon did not work for all brands > of 2N3819, but the new circuit tests OK with all the FETs in my > junk box - so I am confident that the latest circuit will be > reliable. See > http://www.alg.demon.co.uk/radio/136/qrptx.htm > > In the keyed pre-driver, I have reduced the value of the timing > capacitor across the 3.3k resistor from 22 uF to 10 uF. > > I hope that the QRP TX does become a Club Project. Please do not > hesitate to contact me if I can help in any way. > > With best regards, > Steve GW4ALG > Hello, Steve, and thanks a lot for the infos about ur qrp tx..... I didn't have so much time last week to solder some components on board, because holidays arrives soon (just next week, yippee !!!!!)....Never mind, i will take some of them to prepare the little tx during holidays, and hope it will be finished as i come back here to make the previous test !!! i also finish the DF3LP loop with coax RG213, and made some test on 138.830 khz rx.... the BF245C preamp seems to work well, but i don't understand something : - with 7mhz dipole, no lead strapped, i receive DCF39 abt S0 and qrm.... - with DF3LP loop, preamp in alu case, when i connect the shields of the loop, signal is abt S1.... - when i connect only 1 shield, and only the center of the other side, signal is S5 and "util signal" seems strong... -when i disconnect the two shield of the loop, signal is S7 to S9, and "util signal" seems to be the same.. (just a little more noisy !!!!).... I just don't know what to think !!!! any idea ???? i couldn't make more test on amateur signal because of my free time..... Best 73's to you and hope to hear you soon .....Pascal.....F5PNP.... http://f6kaw.free.fr