X-GM-THRID: 1205903251970779181 X-Gmail-Labels: rsgb lf X-Gmail-Received: 597353abaa73ed1d915311404f134e11dbbb3d93 Delivered-To: daveyxm@gmail.com Received: by 10.54.127.17 with SMTP id z17cs1034wrc; Sun, 11 Jun 2006 08:16:00 -0700 (PDT) Received: by 10.78.17.4 with SMTP id 4mr238453huq; Sun, 11 Jun 2006 08:15:59 -0700 (PDT) Return-Path: Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mx.gmail.com with ESMTP id 30si695225hub.2006.06.11.08.15.57; Sun, 11 Jun 2006 08:15:59 -0700 (PDT) Received-SPF: neutral (gmail.com: 193.82.116.20 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1FpRau-00036f-QK for rs_out_1@blacksheep.org; Sun, 11 Jun 2006 16:11:16 +0100 Received: from [193.82.59.130] (helo=relay2.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1FpRat-00036W-NE for rsgb_lf_group@blacksheep.org; Sun, 11 Jun 2006 16:11:15 +0100 Received: from smtp2.versatel.nl ([62.58.50.89]) by relay2.thorcom.net with esmtp (Exim 4.51) id 1FpRap-0000Cd-Ea for rsgb_lf_group@blacksheep.org; Sun, 11 Jun 2006 16:11:15 +0100 Received: (qmail 4976 invoked by uid 0); 11 Jun 2006 15:10:58 -0000 Received: from unknown (HELO ibm) ([62.59.190.96]) (envelope-sender ) by smtp2.versatel.nl (qmail-ldap-1.03) with SMTP for < >; 11 Jun 2006 15:10:58 -0000 Message-ID: <000501c68d67$e09755c0$2102000a@ibm> From: "Dick" To: Date: Sun, 11 Jun 2006 17:00:06 +0200 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.00.2615.200 X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2615.200 X-Spam-Score: -0.3 (/) X-Spam-Report: autolearn=disabled,AWL=-0.774,FROM_ENDS_IN_NUMS=0.516 Subject: LF: PA4VHF/p fieldday report Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.9 required=5.0 tests=FROM_ENDS_IN_NUMS 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 Status: O X-Status: X-Keywords: X-UID: 5367 Well, back home again after some 136kHz tests this weekend. Several unexpected problems showed up, so there's still work to do on the station. I wasn't able to put my new transmitter with 4xIRFP450 on the air. It did work prefectly on a 50Ohm dummy load, but with the antenna connected I just couldn't get it into the air. The SWR protection continiously came in, even when reducing the drainvoltage to 40 Volts. I tried to re-adjust the SWR protection circuit, but that didn't help either. I once get some power out for a fraction of a second, just enough to see a flash over some-where in the ouput filter. I had to run the good old 2xIRFP260 transmitter (G0MRF) and that one did work excellent. No problem at all to run 60V/9A input, producing over 1 Amp antenna current. However, after long and desperate CQ-calls the first transformer (a large 50mm ring core) that matches the 50 Ohm coax upto around 150-200 Ohm got really hot............ That means ....... losses....... I also lost my LF SWR bridge.......due to loss of the diodes, I think. Despite this I managed to make 1 QSO by incidence. It was yesterday afternoon, when after some tests I was talking with some people standing around the station. Suddenly I heard someone tuning up on my receiver, which was still with its speaker on in the background. I immidiatly ran to the receiver, searching for the one tuning. It was Mal, G3KEV CQ-ing! I had to call hime once, and the was was made! In front of several fellow hams, and a TV-camera from someone making a video film about HAM radio. So, dispite all at least an QSO completed. Now, I have to figure out what went wrong, and how to solve this. Somehow the number of turns in the output circuit of the TX is not right......... I think I wasn't able to reduce the power produced by the 4 FET unit, enough to get it out of the protection area. This weekend raised also the question, if I should go on with the preparations for the LX/PA6Z expedition, because of the fact that I didn't hear anybody else except Mal............... and some QRSS station on 136.3...... Well thanks all for listening, and calling (if there was somebody calling, hi....) Maybe WX was too nice to operate..... I will keep you all informed about further activeties. 73 Dick, PA4VHF/p from JO32EE