Return-Path: Received: from mtain-dh02.r1000.mx.aol.com (mtain-dh02.r1000.mx.aol.com [172.29.65.22]) by air-de04.mail.aol.com (v129.4) with ESMTP id MAILINDE042-5eaf4d839f4343; Fri, 18 Mar 2011 14:06:59 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dh02.r1000.mx.aol.com (Internet Inbound) with ESMTP id 3B5D138000095; Fri, 18 Mar 2011 14:06:58 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Q0e3w-00041W-Un for rs_out_1@blacksheep.org; Fri, 18 Mar 2011 18:06:12 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Q0e3w-00041L-Hv for rsgb_lf_group@blacksheep.org; Fri, 18 Mar 2011 18:06:12 +0000 Received: from fish2.hurontel.on.ca ([216.46.129.163]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Q0e3u-0003ki-Nk for rsgb_lf_group@blacksheep.org; Fri, 18 Mar 2011 18:06:12 +0000 X-ASG-Debug-ID: 1300471566-383e43410001-a32kfu Received: from [192.168.1.100] (pppoe.dyn-216.46.157.232.hurontel.on.ca [216.46.157.232]) by fish2.hurontel.on.ca with ESMTP id p9SG2JvOLpULpsx9 for ; Fri, 18 Mar 2011 14:06:06 -0400 (EDT) X-Barracuda-Envelope-From: weazle@hurontel.on.ca X-Barracuda-Apparent-Source-IP: 216.46.157.232 Mime-Version: 1.0 (Apple Message framework v1082) X-ASG-Orig-Subj: Re: LF: Re: Loop TX antennas at VLF? From: John Bruce McCreath X-Priority: 3 In-Reply-To: <59F87B1BA5D04A2F98902CF94C38DB30@JimPC> Date: Fri, 18 Mar 2011 14:06:06 -0400 Message-Id: References: <59F87B1BA5D04A2F98902CF94C38DB30@JimPC> To: rsgb_lf_group@blacksheep.org X-Mailer: Apple Mail (2.1082) X-Barracuda-Connect: pppoe.dyn-216.46.157.232.hurontel.on.ca[216.46.157.232] X-Barracuda-Start-Time: 1300471566 X-Barracuda-URL: http://fish.hurontel.on.ca:8000/cgi-mod/mark.cgi X-Virus-Scanned: by bsmtpd at hurontel.on.ca X-Barracuda-Spam-Score: 0.00 X-Barracuda-Spam-Status: No, SCORE=0.00 using global scores of TAG_LEVEL=1000.0 QUARANTINE_LEVEL=1000.0 KILL_LEVEL=5.0 tests= X-Barracuda-Spam-Report: Code version 3.2, rules version 3.2.2.58276 Rule breakdown below pts rule name description ---- ---------------------- -------------------------------------------------- X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: Re: Loop TX antennas at VLF? Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none 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 x-aol-global-disposition: G x-aol-sid: 3039ac1d41164d839f41213c X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Hi Jim, LFers, > A 10m x 10m, 100m^2 loop of "thickish" 3mm dia solid wire would have a= resistance at 9kHz of roughly 0.1ohm. > With 100W available, 32A antenna current should be possible, assuming ne= gligible tuning capacitor losses. > Inductance would be of the order of 40uH. A tuning capacitor of roughly= 8uF would be needed. Would the oil-filled motor run caps work in this application? If so, they= are readily available and inexpensive. 73, J.B., VE3EAR LowFER Beacon "EAR" 188.830 kHz. QRSS30 EN93dr