Return-Path: Received: (qmail 77635 invoked from network); 29 Mar 2005 21:02:41 -0000 Received: from unknown (HELO ptb-mxcore03.plus.net) (212.159.14.217) by ptb-mailstore01.plus.net with SMTP; 29 Mar 2005 21:02:41 -0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore03.plus.net with esmtp (Exim) id 1DGNtv-000204-Pg for dave@picks.force9.co.uk; Tue, 29 Mar 2005 22:05:28 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1DGNqy-0005Iu-Ph for rs_out_1@blacksheep.org; Tue, 29 Mar 2005 22:02:24 +0100 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1DGNqy-0005Il-DW for rsgb_lf_group@blacksheep.org; Tue, 29 Mar 2005 22:02:24 +0100 Received: from mta204-rme.xtra.co.nz ([210.86.15.147]) by relay.thorcom.net with esmtp (Exim 4.43) id 1DGNqw-000855-FB for rsgb_lf_group@blacksheep.org; Tue, 29 Mar 2005 22:02:24 +0100 Received: from mta2-rme.xtra.co.nz ([210.86.15.240]) by mta204-rme.xtra.co.nz with ESMTP id <20050329210213.PDAP23939.mta204-rme.xtra.co.nz@mta2-rme.xtra.co.nz> for ; Wed, 30 Mar 2005 09:02:13 +1200 Received: from bob2l2u6k2n1g3 ([210.86.86.183]) by mta2-rme.xtra.co.nz with SMTP id <20050329210213.XULZ8463.mta2-rme.xtra.co.nz@bob2l2u6k2n1g3> for ; Wed, 30 Mar 2005 09:02:13 +1200 Message-ID: <000301c534a2$a05c5880$e901a8c0@bob2l2u6k2n1g3> From: "Vernall" To: rsgb_lf_group@blacksheep.org References: <004101c534a0$e03f8c80$2102000a@ibm> Date: Wed, 30 Mar 2005 09:02:29 +1200 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-SPF-Result: relay.thorcom.net: domain of xtra.co.nz designates 210.86.15.147 as permitted sender X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=failed,none Subject: LF: Re: low long wire as TX-antenna??? Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit 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=MAILTO_TO_SPAM_ADDR 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 Dick PA4VHF, Bruce ZL1WB has a "long wire" antenna, strung over a valley, and about 1000 metres long if my memory is in the right ball park. The antenna is made of "power line" wire and the average height is only tens of metres above the valley floor. The antenna is substantially "horizontally polarised" and that is not what the text books talk about for launching signal at LF. However, for frequencies around 180 kHz Bruce has an outstanding signal in ZL, and was the first to be heard in VK. That "long wire" is easily the most effective home station LF transmitting antenna for a ZL amateur. So if you have the room for an experiment, I would advise to "press the button". I'm not so sure about the wire being only 1 metre above ground, from both loss and safety points of view. And don't worry about your call sign, I'm sure you have a suitable PA for LF ;-) 73, Bob ZL2CA ----- Original Message ----- From: "Dick" To: Sent: Wednesday, March 30, 2005 8:49 AM Subject: LF: low long wire as TX-antenna??? >I wonder if anyone here has experience in using a low long wire as TX > antenna on 136kHz. > > I'm thinking of around 400-500m long wire at 1m above ground. > I still have a lot of 'portable'beverage stuff lying around from my > previous activeties: > mediumwave and NDB-beacon DX. > Maybe it's worthwile to try......... > > Dick, pa4vhf > > >