Return-Path: Received: (qmail 22215 invoked from network); 11 Apr 2001 20:36:05 -0000 Received: from unknown (HELO murphys-inbound.servers.plus.net) (212.159.14.225) by excalibur.plus.net with SMTP; 11 Apr 2001 20:36:05 -0000 Received: (qmail 24947 invoked from network); 11 Apr 2001 20:36:03 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys with SMTP; 11 Apr 2001 20:36:03 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 14nREs-0003HB-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 11 Apr 2001 21:29:18 +0100 Received: from ds-img-7.compuserve.com ([149.174.206.153] helo=spdmbaaa.compuserve.com) by post.thorcom.com with esmtp (Exim 3.16 #2) id 14nREp-0003H5-00 for rsgb_lf_group@blacksheep.org; Wed, 11 Apr 2001 21:29:15 +0100 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: (from mailgate@localhost) by spdmbaaa.compuserve.com (8.9.3/8.9.3/SUN-1.9) id QAA06744 for rsgb_lf_group@blacksheep.org; Wed, 11 Apr 2001 16:28:17 -0400 (EDT) Date: Wed, 11 Apr 2001 16:27:22 -0400 From: "boffin1" Subject: Re: LF: LF Antennas To: rsgb_lf_group@blacksheep.org Message-ID: <200104111627_MC2-CC26-D7B@compuserve.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Disposition: inline Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Mike, Sorry for a misunderstanding. If all that concerns you is matching then it does not matter if there is a ferrite core or no ferrite core, but if you are also interested in getting greater efficiency by obtaining more radiation from the top end, then my comments are valid. The simple point that I was making is well illustrated by considering an ordinary ferrite core aerial on a receiver, the efficiency on reception incrreases but the efficiency on transmission decreases by the same factor - the ratio of B to H. So if you are not interested in getting a bit more radiation from the top end but only want to change the matching impedance, please ignore my comment and go ahead! With kind regards, Roger.