Return-Path: Received: (qmail 20930 invoked from network); 6 Mar 2000 00:17:30 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by grants.core.plus.net.uk with SMTP; 6 Mar 2000 00:17:30 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 12Rl6o-0001qb-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 06 Mar 2000 00:10:50 +0000 Received: from irwell.zetnet.co.uk ([194.247.47.48] ident=root) by post.thorcom.com with esmtp (Exim 3.02 #1) id 12Rl6n-0001qV-00 for rsgb_lf_group@blacksheep.org; Mon, 06 Mar 2000 00:10:49 +0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from central.zetnet.co.uk (central.zetnet.co.uk [194.247.47.20]) by irwell.zetnet.co.uk (8.9.3/8.9.3/Debian/GNU) with SMTP id AAA15586 for ; Mon, 6 Mar 2000 00:10:34 GMT X-ZSender: g3ldo@zetnet.co.uk X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Message-ID: <2000030600075668199@zetnet.co.uk> Date: Mon, 6 Mar 2000 00:07:56 GMT To: rsgb_lf_group@blacksheep.org From: "Peter Dodd" X-Mailer: ZIMACS Version 1.20c 10000836 Subject: LF: Re: LF Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Content-type: text/plain; charset=windows-1252; format=flowed MIME-Version: 1.0 Content-transfer-encoding: 8bit Looked for I5TGC again on Saturday evening. His signal came up to a very good 'O' at 2030 and went down into the noise within 10 mins. Another expedition to Amberley Museum. Had a QSO with GI3PDN before getting down to the business of trying resonant radials. The antenna system comprises about 300m of antenna wire, a loading coil, a centre tuning variometer and a tuner variometer for a 250m radial. The system will work but trying to get all these different tuning arrangements, plus the matching, is difficult. With the centre tuning system floating it can rise to quite a high RF voltage resulting in RF feedback and attacks on your fingers when you try to tune the thing. I dont think tuned radials is the way to go, well not in my case. I did these tests high in the band and I trust I didn't QRM anyone doing QRSS that I couldn't hear. At one stage I heard HB9DCE with a 569 signal working G3YXM. After their QSO I called HB9DCE and got a 449 report although by that time the signal was starting to fade. Also the RF feedback made the QSO a bit difficult. This I found interesting because there is a lot of high ground to the south of the antenna, made up mainly of chalk. It seems fairly transparent to LF signals. As regards 73kHz EU cross band QSOs, the first one I had was on normal CW with F6CNI, my frequency 72.6kHz and the return frequency on 80m. This QSO was on 28/3/98 at 1845, my report 539. Distance 337km. The second was 9/3/99 at 2000, with Toni HB9ASB. This was on QRSS 73kHz/137kHz, 'O' both ways. I will go to GWM radio in Worthing and see if I can get some crystals to modify my mixer/driver for 73kHz. -- Regards, Peter, G3LDO