Return-Path: Received: (qmail 61887 invoked from network); 10 Jan 2005 00:41:30 -0000 Received: from unknown (HELO ptb-spamcore02.plus.net) (192.168.71.3) by ptb-mailstore02.plus.net with SMTP; 10 Jan 2005 00:41:30 -0000 Received: from mailnull by ptb-spamcore02.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1Cnnc8-000AsW-Rh for dave@picks.force9.co.uk; Mon, 10 Jan 2005 00:40:58 +0000 Received: from [192.168.67.2] (helo=ptb-mxcore02.plus.net) by ptb-spamcore02.plus.net with esmtp (Exim 4.32; FreeBSD) id 1Cnnc8-000AsR-Jl for dave@picks.force9.co.uk; Mon, 10 Jan 2005 00:40:56 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore02.plus.net with esmtp (Exim) id 1Cnnce-0004Jr-76 for dave@picks.force9.co.uk; Mon, 10 Jan 2005 00:41:28 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Cnna0-0005tO-FS for rs_out_1@blacksheep.org; Mon, 10 Jan 2005 00:38:44 +0000 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1CnnZz-0005tF-Pl for rsgb_lf_group@blacksheep.org; Mon, 10 Jan 2005 00:38:43 +0000 Received: from mail-public.northwestel.net ([198.235.201.66] helo=yk-pvtmailprd-01.internal.messaging) by relay.thorcom.net with esmtp (Exim 4.43) id 1CnnZw-0002Zp-Vs for rsgb_lf_group@blacksheep.org; Mon, 10 Jan 2005 00:38:43 +0000 Received: from yk-asavprd-02.northwestel.net ([172.19.112.41]) by yk-pvtmailprd-01.internal.messaging (Sun ONE Messaging Server 6.0 Patch 1 (built Jan 28 2004)) with ESMTP id <0IA200ASMSGCK910@yk-pvtmailprd-01.internal.messaging> for rsgb_lf_group@blacksheep.org; Sun, 09 Jan 2005 17:38:36 -0700 (MST) Received: from localhost (localhost [127.0.0.1]) by yk-asavprd-02.northwestel.net (8.12.11/8.12.11) with ESMTP id j0A0canV017832 for ; Sun, 09 Jan 2005 17:38:36 -0700 Received: from yk-asavprd-02.northwestel.net ([127.0.0.1]) by localhost (yk-asavprd-02 [127.0.0.1]) (amavisd-new, port 10024) with LMTP id 16335-15-2 for ; Sun, 09 Jan 2005 17:38:35 -0700 (MST) Received: from eagles (whthyt032-92.northwestel.net [205.234.32.92]) by yk-asavprd-02.northwestel.net (8.12.11/8.12.11) with SMTP id j0A0bcRn017603 for ; Sun, 09 Jan 2005 17:37:38 -0700 Date: Mon, 10 Jan 2005 00:37:36 +0000 From: "J. Allen" To: rsgb_lf_group@blacksheep.org Message-id: <007801c4f6ac$9538ec40$6401a8c0@eagles> MIME-version: 1.0 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-Priority: 3 X-MSMail-priority: Normal X-Virus-Scanned: by amavisd-new at northwestel.net References: <12c.54d56369.2f12680d@aol.com> X-SPF-Result: relay.thorcom.net: 198.235.201.66 is neither permitted nor denied by domain of northwestel.net X-Spam-Score: 0.1 (/) X-Spam-Report: autolearn=failed,FORGED_RCVD_HELO=0.05 Subject: LF: Antenna plans de J. Content-type: text/plain; charset=iso-8859-1; format=flowed Content-transfer-encoding: 8bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com 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-Spam-Filtered: by PlusNet SpamCORE (v3.00) Alex, Jim, Markus, and LF, The reason for setting my calculations in front of all, is that I am new to LF and want the station to have early success, rather than being a set of mistakes and recoveries. You might be surprised, but although I am a 4th dan black belt and head of TaeKwon-Do Yukon, I am not a fighter, and have a tendency to give up on things which I have made a solid attempt at and find repeated failures. The reason for using the complicated antenna structure as I describe it is that it is already standing... It is a large HF/MF V-beam with ~120 meter legs up ~20 meters, with ~55 degree included angle. The antenna is fed with 75 Ohm hard line which was in with a number of damaged tower sections which I earned by cleaning up a commercial broadcasting station construction site. The towers had been taken down by persons unknown who cut the guy lines and let the towers fall! I use this antenna on 160-2 meters and it functions quite well with an antenna tuner. It is the receive antenna which I am now using on LF and although it is a sort of "short dipole"on LF, it works very well. The area of the antenna for several KM in all directions is poor sandy soil. I have on site approximately 20 km of ~#10 copper-clad high-tensile steel wire, which was used for overhead telephone wires for many years. This can be buried for radials or more wires run up high to increase top capacitance. How big does the elevated counterpoise need to be at LF to be effective? With the wire I have available, I could make a fairly large one in terms of feet, but it would still be small in terms of wavelength. It may be easier to put a loading inductor out at the tower end of each insulator, and add LF to the antenna use, than to build a new antenna system. As to the typo.. It is not critical now that I know about it and can make allowance for it... When the loading coils are in and measurements can be take of the LF antenna as a system, I will again send calculations to the LF reflector to make sure that I am not running more power than I should be. I prefer to have someone look at my work. These are my limitations: Technical Operation Data: -A transmitter will be used between the frequencies of 135.7 and 137.8kHz, in the 2200 metre band. -Emissions outside of this frequency range will be suppressed by a minimum of 30db from the fundamental signal. -Bandwidth of the transmitted signal will be limited to 100Hz or less. -Radiated power will not exceed 1 watt ERP. -The transmitter will be operated with care not to interfere with authorized users. Authorization for experimental transmissions will be on a secondary user basis. I am aware of Canadian military operations in this frequency range and will avoid transmitting on their frequencies. Any requests from primary users to cease transmission or to change frequency will be immediately complied with. I did not think to set 1W ERP relative to anything... I do not know what Industry Canada normally measures it to, and will need advice from experienced Canadian LF ops like Steve or Scott on the normal comparison for ERP. Alex, Thank you for your continuing help. I am retired and live on a fixed, small income. Litz (sp?) wire in not being considered. I have friends at the local power company who are watching for a "pole pig" or other transformer with a burned primary winding and good secondary, which I can acquire at the value of the scrap copper within it. I plan to disassemble it for the flat secondary copper strap winding, which is usually well insulated with a material that looks like varnish. I have been given three pieces of 13 inch X 36 inch long PVC pipe, which I was going to use for loading coil forms (formers), but have been told that they are lossy and I should use something else. At this point I am still planning to disassemble the transformer, but I do not know whether to use the PVC and accept the loss from it or to use another type of coil form. I have about 20 pieces of 5/16 inch X 60 inch fiberglass rods which I can use to make a form if needed. I can move the V wire insulators out from the tower by a couple meters if it will help. I have found this LF group to be friendly and supportive, and believe that my chances of success are very likely to be a reflection of your direction. I appreciate the humor of the group as well. J.