Return-Path: Received: (qmail 18298 invoked from network); 23 Jul 1999 16:57:10 +0100 Received: from magnus.plus.net.uk (HELO magnus.force9.net) (195.166.128.27) by guiness.force9.net with SMTP; 23 Jul 1999 16:57:10 +0100 Received: (qmail 21485 invoked from network); 23 Jul 1999 15:59:33 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by magnus.plus.net.uk with SMTP; 23 Jul 1999 15:59:33 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 117hUc-0006Iz-00 for rsgb_lf_group-outgoing@blacksheep.org; Fri, 23 Jul 1999 16:44:14 +0100 X-Priority: 3 Received: from mailout09.btx.dtag.de ([194.25.2.157]) by post.thorcom.com with esmtp (Exim 3.02 #1) id 117hUb-0006Iu-00 for rsgb_lf_group@blacksheep.org; Fri, 23 Jul 1999 16:44:13 +0100 X-MSMail-Priority: Normal Received: from fwd07.btx.dtag.de ([194.25.2.167]) by mailout09.btx.dtag.de with smtp id 117hUY-0002Pd-00; Fri, 23 Jul 1999 17:44:10 +0200 Received: (087321565-0001(btxid)@[193.158.171.14]) by fwd07.btx.dtag.de id ; Fri, 23 Jul 1999 17:43:58 +0200 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Message-ID: Date: Fri, 23 Jul 1999 17:43:58 +0200 To: rsgb_lf_group@blacksheep.org References: Subject: Re: LF: 22. july, more radials but no increase in antenna current X-Mailer: T-Online eMail 2.3 MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 8bit X-Sender: 087321565-0001@t-online.de From: "Hans-Joachim Brandt" Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org Sender: Hello all, several observations have been reported so far (including my own) that parallelling of different LF grounds do not always improve antenna current but even may reduce it, de facto increasing the ground resistance. In our LF Forum during the Ham Radio at Friedrichshafen I have also raised this point in my speech and have mentioned as a possible explanation, that LF grounds of any kind may not be regarded as pure real resistances, which could be paralleled without any problems. Perhaps they must be regarded as komplex resistances, combining real and reactive elements, be it inductive or capacitive. Such ground could be paralleled sucesfully only after the reactive elements have been tuned out. This hypothesis had been the outcome of a discussion on these observations with a swedish radio amateur (Bo Lindell, from Ericsson) which I have met at ETSI. Any further observations and results on this topic would be appreciated. Also nice to mention: When I raised this point on a local club evening meeting, a grey-haired OM gave me an old-fashioned foil dielectric variable capacitor of 12.000 (twelve thousand) pF! This was really a good help to investigate this problem. 73 Ha-Jo, DJ1ZB Koenig, Wolfgang schrieb: > Hallo Group, > > Yesterday I installed abt. 20 radials (10-35m) to my antenna system. But > there was no significant change of the antenna current. The current is abt > .6 A with and without the redials. Can anyone explain this? > > 73 Wolf (DL1SAN)