Return-Path: Received: (qmail 3173 invoked from network); 3 Jan 2001 19:02:10 -0000 Received: from unknown (HELO murphys-inbound.servers.plus.net) (212.159.14.225) by excalibur.plus.net with SMTP; 3 Jan 2001 19:02:10 -0000 Received: (qmail 18104 invoked from network); 3 Jan 2001 18:56:51 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys with SMTP; 3 Jan 2001 18:56:51 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from majordom by post.thorcom.com with local (Exim 3.16 #1) id 14DswP-0003I2-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 03 Jan 2001 18:47:17 +0000 Received: from hs-img-2.compuserve.com ([149.174.177.151] helo=sphmgaab.compuserve.com) by post.thorcom.com with esmtp (Exim 3.16 #1) id 14DswO-0003Hx-00 for rsgb_lf_group@blacksheep.org; Wed, 03 Jan 2001 18:47:16 +0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: (from mailgate@localhost) by sphmgaab.compuserve.com (8.9.3/8.9.3/SUN-1.9) id NAA27962 for rsgb_lf_group@blacksheep.org; Wed, 3 Jan 2001 13:47:03 -0500 (EST) Date: Wed, 3 Jan 2001 13:45:58 -0500 From: "'Geri' Kinzel, DK8KW" Subject: Re: LF: Gyrators To: rsgb_lf_group@blacksheep.org Message-ID: <200101031346_MC2-C076-A2B@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: Alberto I2PHD, >As a matter of fact, at 137 kHz the inductance values aren't so big >to make it impractical to wind them. At 9 kHz things are a bit different...< Alberto, first of all thanks for providing ARGO, I have played around with it and found it very useful. About the coils on 9 kHz: I am using a u-shaped core with a closing bar on top made of ferrite material (special thanks to Markus, DF6NM). Using this setup I have a coil wit 1 H (one Henry) inductivity, lifting the ferrite bar on top by means of a screw some tenth of a millimeter I can fine-tune this coil between about 0.5 and 1 H. With 10 Watts output I achieve a current of roughly 130 mA into my 18m vertical ... sufficient for about 770m distance ... Best 73 Geri, DK8KW (W1KW)