Envelope-to: dave@picks.force9.co.uk Delivery-date: Thu, 26 May 2005 12:03:25 +0100 Received: by pih-mxcore11.plus.net with spam-scanned (PlusNet MXCore v2.00) id 1DbG96-0004Mi-Es for dave@picks.force9.co.uk; Thu, 26 May 2005 12:03:25 +0100 Received: from post.thorcom.com ([193.82.116.20]) by pih-mxcore11.plus.net with esmtp (PlusNet MXCore v2.00) id 1DbG96-0004M8-0v for dave@picks.force9.co.uk; Thu, 26 May 2005 12:03:24 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1DbG7q-0002qk-MF for rs_out_1@blacksheep.org; Thu, 26 May 2005 12:02:06 +0100 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1DbG7q-0002qb-A1 for rsgb_lf_group@blacksheep.org; Thu, 26 May 2005 12:02:06 +0100 Received: from smtp-out1.hurontel.on.ca ([216.46.129.246]) by relay.thorcom.net with esmtp (Exim 4.43) id 1DbG7n-00013d-NV for rsgb_lf_group@blacksheep.org; Thu, 26 May 2005 12:02:06 +0100 Received: from mail.hurontel.on.ca (mail.hurontel.on.ca [216.46.129.11]) by smtp-out1.hurontel.on.ca (8.13.1/8.13.1) with ESMTP id j4QAtn10029479 for ; Thu, 26 May 2005 06:55:49 -0400 Received: from server (dial-95.hurontel.on.ca [216.46.128.95]) by mail.hurontel.on.ca (8.12.10+Sun/8.12.10) with SMTP id j4QB2QJF027561 for ; Thu, 26 May 2005 07:02:27 -0400 (EDT) Message-ID: <00b701c561da$4491d560$98802ed8@server> From: "J. B. Weazle McCreath" To: rsgb_lf_group@blacksheep.org References: <000c01c55a6e$8d82f740$37d0fc3e@l8p8y6> <000d01c55b45$acb45e60$ac068351@w4o8m9> <002f01c55d97$09df4840$8c802ed8@server> <000901c55d99$bb7d7cf0$0700a8c0@Laptop> <005201c55e00$e1f57ce0$8c802ed8@server> <001901c55e4e$6ceda1e0$0500a8c0@charter.net> <003a01c55ebe$f98b99c0$b7952ed8@server> <007201c5617b$ba3a9400$5211f4cc@p1i5f0> Date: Thu, 26 May 2005 11:04:04 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2720.3000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 X-SPF-Result: relay.thorcom.net: 216.46.129.246 is neither permitted nor denied by domain of hurontel.on.ca Subject: LF: Loop problem revealed? Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit 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-PN-SpamFiltered: by PlusNet MXCore (v2.00) ----- Original Message ----- From: "Steve McDonald" To: Sent: Wednesday, May 25, 2005 11:47 PM Subject: LF: Re: Re: Loop antenna problem > > J.B. - what rx are you using with the loop? Another thought....could there > be a problem with the coax cable? ...old? ...moisture? ....shield open at > the connector? > > Steve / VE7SL > Hi Steve, LFers, I'm using a TS-440SAT. I've checked the feedline with an MFJ-259 antenna analyser, and with a 50 ohm dummy load at the antenna end, it shows as being OK from 1.7 mHz. to well above 4 mHz., but what it is at the LF frequencies may be another matter. With that in mind, I tried a new temporary feedline and saw no improvement. I think that Jim, M0BMU, is onto something when he suggested that the pickup loop is loading down the antenna. There's a short pigtail lead of RG-213 from the junction box on the loop to the hardline I'm using as the feeder. When I connect that pigtail to a 50 ohm dummy load, the signal strength as monitored by a portable LF radio near to the loop goes all to h..l. With the pickup loop disconnected, the tuning of the main loop is very sharp and signals tuned in on the portable LF rx jump way up in strength when I tune the loop thru resonance. This indicates to me that the main loop is working fine and has pretty good Q. I'm going to try the transformer approach tonite. 73, J.B.