Return-Path: Received: (qmail 1290 invoked from network); 25 Jul 1999 15:31:37 +0100 Received: from magnus.plus.net.uk (HELO magnus.force9.net) (195.166.128.27) by guiness.force9.net with SMTP; 25 Jul 1999 15:31:37 +0100 Received: (qmail 29800 invoked from network); 25 Jul 1999 14:34:08 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by magnus.plus.net.uk with SMTP; 25 Jul 1999 14:34:08 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 118PCb-00074i-00 for rsgb_lf_group-outgoing@blacksheep.org; Sun, 25 Jul 1999 15:24:33 +0100 X-Priority: 3 X-MSMail-Priority: Normal Received: from mail1-gui.server.ntli.net ([194.168.222.13]) by post.thorcom.com with esmtp (Exim 3.02 #1) id 118PCa-00074d-00 for rsgb_lf_group@blacksheep.org; Sun, 25 Jul 1999 15:24:32 +0100 Received: from cableol.co.uk ([194.168.18.100]) by mail1-gui.server.ntli.net (Post.Office MTA v3.1 release PO203a ID# 0-33929U70000L2S50) with ESMTP id AAA23033 for ; Sun, 25 Jul 1999 15:12:03 +0100 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Message-ID: <379B1A4A.6ABAC693@cableol.co.uk> Date: Sun, 25 Jul 1999 15:08:10 +0100 From: "Steve Rawlings" X-Mailer: Mozilla 4.04 [en] (Win95; I) MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org Subject: Re: LF: re problems G3XDV and whippy mast extensions? References: <000901becd8c$0f99b640$e8daac3e@default> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 8bit Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org Sender: Alan Melia G3NYK wrote: > . . . . . > My other loony idea was to use a balloon, not like Steve does to hold up the > weight of the whole of his 20m vertical (I think), but just to extend the > height of a 15 metre lightweight mast. If the bottom 15m of wire were thick, > supported by the mast, the upper 15m could be quite thin, light wire. > In fact, I only use the balloons to support the top section (typically, 8 m). This method of increasing the height of the basic vertical means that the average height of the antenna remains reasonably high when the breeze starts to blow, because the 'anchor point' for the additional wire is at 12 m above ground level. For more details, have a look at: http://www.cableol.net/alg/radio/136/experi_vert.htm Regards to all, Steve GW4ALG